merge: license, notice and upstream sync docs

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                      EUROPEAN UNION PUBLIC LICENCE v. 1.2
                      EUPL © the European Union 2007, 2016
 This European Union Public Licence (the ‘EUPL’) applies to the Work (as defined
 below) which is provided under the terms of this Licence. Any use of the Work,
 other than as authorised under this Licence is prohibited (to the extent such
 use is covered by a right of the copyright holder of the Work).
 The Work is provided under the terms of this Licence when the Licensor (as
 defined below) has placed the following notice immediately following the
 copyright notice for the Work:
        Licensed under the EUPL
 or has expressed by any other means his willingness to license under the EUPL.
 1. Definitions
 In this Licence, the following terms have the following meaning:
 - ‘The Licence’: this Licence.
 - ‘The Original Work’: the work or software distributed or communicated by the
  Licensor under this Licence, available as Source Code and also as Executable
  Code as the case may be.
 - ‘Derivative Works’: the works or software that could be created by the
  Licensee, based upon the Original Work or modifications thereof. This Licence
  does not define the extent of modification or dependence on the Original Work
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  determined by copyright law applicable in the country mentioned in Article 15.
 - ‘The Work’: the Original Work or its Derivative Works.
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  convenient for people to study and modify.
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  meant to be interpreted by a computer as a program.
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  the Work under the Licence.
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  Licence, or otherwise contributes to the creation of a Derivative Work.
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  the Work under the terms of the Licence.
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  renting, distributing, communicating, transmitting, or otherwise making
  available, online or offline, copies of the Work or providing access to its
  essential functionalities at the disposal of any other natural or legal
  person.
 2. Scope of the rights granted by the Licence
 The Licensor hereby grants You a worldwide, royalty-free, non-exclusive,
 sublicensable licence to do the following, for the duration of copyright vested
 in the Original Work:
 - use the Work in any circumstance and for all usage,
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 - modify the Work, and make Derivative Works based upon the Work,
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 Those rights can be exercised on any media, supports and formats, whether now
 known or later invented, as far as the applicable law permits so.
 In the countries where moral rights apply, the Licensor waives his right to
 exercise his moral right to the extent allowed by law in order to make effective
 the licence of the economic rights here above listed.
 The Licensor grants to the Licensee royalty-free, non-exclusive usage rights to
 any patents held by the Licensor, to the extent necessary to make use of the
 rights granted on the Work under this Licence.
 3. Communication of the Source Code
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 Executable Code. If the Work is provided as Executable Code, the Licensor
 provides in addition a machine-readable copy of the Source Code of the Work
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 the Source Code is easily and freely accessible for as long as the Licensor
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 Copyleft clause: If the Licensee distributes or communicates copies of the
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 Contributors grant You a licence to their contributions to the Work, under the
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 7. Disclaimer of Warranty
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 Contributors. It is not a finished work and may therefore contain defects or
 ‘bugs’ inherent to this type of development.
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 material or moral, damages of any kind, arising out of the Licence or of the use
 of the Work, including without limitation, damages for loss of goodwill, work
 stoppage, computer failure or malfunction, loss of data or any commercial
 damage, even if the Licensor has been advised of the possibility of such damage.
 However, the Licensor will be liable under statutory product liability laws as
 far such laws apply to the Work.
 9. Additional agreements
 While distributing the Work, You may choose to conclude an additional agreement,
 defining obligations or services consistent with this Licence. However, if
 accepting obligations, You may act only on your own behalf and on your sole
 responsibility, not on behalf of the original Licensor or any other Contributor,
 and only if You agree to indemnify, defend, and hold each Contributor harmless
 for any liability incurred by, or claims asserted against such Contributor by
 the fact You have accepted any warranty or additional liability.
 10. Acceptance of the Licence
 The provisions of this Licence can be accepted by clicking on an icon ‘I agree’
 placed under the bottom of a window displaying the text of this Licence or by
 affirming consent in any other similar way, in accordance with the rules of
 applicable law. Clicking on that icon indicates your clear and irrevocable
 acceptance of this Licence and all of its terms and conditions.
 Similarly, you irrevocably accept this Licence and all of its terms and
 conditions by exercising any rights granted to You by Article 2 of this Licence,
 such as the use of the Work, the creation by You of a Derivative Work or the
 Distribution or Communication by You of the Work or copies thereof.
 11. Information to the public
 In case of any Distribution or Communication of the Work by means of electronic
 communication by You (for example, by offering to download the Work from a
 remote location) the distribution channel or media (for example, a website) must
 at least provide to the public the information requested by the applicable law
 regarding the Licensor, the Licence and the way it may be accessible, concluded,
 stored and reproduced by the Licensee.
 12. Termination of the Licence
 The Licence and the rights granted hereunder will terminate automatically upon
 any breach by the Licensee of the terms of the Licence.
 Such a termination will not terminate the licences of any person who has
 received the Work from the Licensee under the Licence, provided such persons
 remain in full compliance with the Licence.
 13. Miscellaneous
 Without prejudice of Article 9 above, the Licence represents the complete
 agreement between the Parties as to the Work.
 If any provision of the Licence is invalid or unenforceable under applicable
 law, this will not affect the validity or enforceability of the Licence as a
 whole. Such provision will be construed or reformed so as necessary to make it
 valid and enforceable.
 The European Commission may publish other linguistic versions or new versions of
 this Licence or updated versions of the Appendix, so far this is required and
 reasonable, without reducing the scope of the rights granted by the Licence. New
 versions of the Licence will be published with a unique version number.
 All linguistic versions of this Licence, approved by the European Commission,
 have identical value. Parties can take advantage of the linguistic version of
 their choice.
 14. Jurisdiction
 Without prejudice to specific agreement between parties,
 - any litigation resulting from the interpretation of this License, arising
  between the European Union institutions, bodies, offices or agencies, as a
  Licensor, and any Licensee, will be subject to the jurisdiction of the Court
  of Justice of the European Union, as laid down in article 272 of the Treaty on
  the Functioning of the European Union,
 - any litigation arising between other parties and resulting from the
  interpretation of this License, will be subject to the exclusive jurisdiction
  of the competent court where the Licensor resides or conducts its primary
  business.
 15. Applicable Law
 Without prejudice to specific agreement between parties,
 - this Licence shall be governed by the law of the European Union Member State
  where the Licensor has his seat, resides or has his registered office,
 - this licence shall be governed by Belgian law if the Licensor has no seat,
  residence or registered office inside a European Union Member State.
 Appendix
 ‘Compatible Licences’ according to Article 5 EUPL are:
 - GNU General Public License (GPL) v. 2, v. 3
 - GNU Affero General Public License (AGPL) v. 3
 - Open Software License (OSL) v. 2.1, v. 3.0
 - Eclipse Public License (EPL) v. 1.0
 - CeCILL v. 2.0, v. 2.1
 - Mozilla Public Licence (MPL) v. 2
 - GNU Lesser General Public Licence (LGPL) v. 2.1, v. 3
 - Creative Commons Attribution-ShareAlike v. 3.0 Unported (CC BY-SA 3.0) for
  works other than software
 - European Union Public Licence (EUPL) v. 1.1, v. 1.2
 - Québec Free and Open-Source Licence — Reciprocity (LiLiQ-R) or Strong
  Reciprocity (LiLiQ-R+).
 The European Commission may update this Appendix to later versions of the above
 licences without producing a new version of the EUPL, as long as they provide
 the rights granted in Article 2 of this Licence and protect the covered Source
 Code from exclusive appropriation.
 All other changes or additions to this Appendix require the production of a new
 EUPL version.
@@ -0,0 +1,332 @@
 HellionChat — a privacy-focused fork of ChatTwo
 Copyright (c) 2024-2025 Infiziert90 (Infi) and Anna Clemens
    (original ChatTwo authors and copyright holders of the upstream work
    this fork is built on)
 Copyright (c) 2025-2026 Florian Wathling / Hellion Online Media
    (HellionChat-specific modifications, Privacy/Export/Auto-Tell-Tabs
    features, Hellion theme, German localisation, EUPL-1.2 fork
    maintenance)
 Licensed under the European Union Public Licence (EUPL), Version 1.2 only.
 You may obtain a copy of the Licence at:
 https://eupl.eu/1.2/en/
 Unless required by applicable law or agreed to in writing, software
 distributed under the Licence is distributed on an "AS IS" basis, WITHOUT
 WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 Licence for the specific language governing permissions and limitations
 under the Licence.
 The full Licence text follows below.
 ================================================================================
 EUROPEAN UNION PUBLIC LICENCE v. 1.2
 EUPL (c) the European Union 2007, 2016
 This European Union Public Licence (the 'EUPL') applies to the Work (as
 defined below) which is provided under the terms of this Licence. Any use
 of the Work, other than as authorised under this Licence is prohibited (to
 the extent such use is covered by a right of the copyright holder of the
 Work).
 The Work is provided under the terms of this Licence when the Licensor (as
 defined below) has placed the following notice immediately following the
 copyright notice for the Work:
    Licensed under the EUPL
 or has expressed by any other means his willingness to license under the
 EUPL.
 1. Definitions
 In this Licence, the following terms have the following meaning:
 - 'The Licence': this Licence.
 - 'The Original Work': the work or software distributed or communicated by
  the Licensor under this Licence, available as Source Code and also as
  Executable Code as the case may be.
 - 'Derivative Works': the works or software that could be created by the
  Licensee, based upon the Original Work or modifications thereof. This
  Licence does not define the extent of modification or dependence on the
  Original Work required in order to classify a work as a Derivative Work;
  this extent is determined by copyright law applicable in the country
  mentioned in Article 15.
 - 'The Work': the Original Work or its Derivative Works.
 - 'The Source Code': the human-readable form of the Work which is the most
  convenient for people to study and modify.
 - 'The Executable Code': any code which has generally been compiled and
  which is meant to be interpreted by a computer as a program.
 - 'The Licensor': the natural or legal person that distributes or
  communicates the Work under the Licence.
 - 'Contributor(s)': any natural or legal person who modifies the Work under
  the Licence, or otherwise contributes to the creation of a Derivative
  Work.
 - 'The Licensee' or 'You': any natural or legal person who makes any usage
  of the Work under the terms of the Licence.
 - 'Distribution' or 'Communication': any act of selling, giving, lending,
  renting, distributing, communicating, transmitting, or otherwise making
  available, online or offline, copies of the Work or providing access to
  its essential functionalities at the disposal of any other natural or
  legal person.
 2. Scope of the rights granted by the Licence
 The Licensor hereby grants You a worldwide, royalty-free, non-exclusive,
 sublicensable licence to do the following, for the duration of copyright
 vested in the Original Work:
 - use the Work in any circumstance and for all usage,
 - reproduce the Work,
 - modify the Work, and make Derivative Works based upon the Work,
 - communicate to the public, including the right to make available or
  display the Work or copies thereof to the public and perform publicly,
  as the case may be, the Work,
 - distribute the Work or copies thereof,
 - lend and rent the Work or copies thereof,
 - sublicense rights in the Work or copies thereof.
 Those rights can be exercised on any media, supports and formats, whether
 now known or later invented, as far as the applicable law permits so.
 In the countries where moral rights apply, the Licensor waives his right
 to exercise his moral right to the extent allowed by law in order to make
 effective the licence of the economic rights here above listed.
 The Licensor grants to the Licensee royalty-free, non-exclusive usage
 rights to any patents held by the Licensor, to the extent necessary to
 make use of the rights granted on the Work under this Licence.
 3. Communication of the Source Code
 The Licensor may provide the Work either in its Source Code form, or as
 Executable Code. If the Work is provided as Executable Code, the Licensor
 provides in addition a machine-readable copy of the Source Code of the
 Work along with each copy of the Work that the Licensor distributes or
 indicates, in a notice following the copyright notice attached to the
 Work, a repository where the Source Code is easily and freely accessible
 for as long as the Licensor continues to distribute or communicate the
 Work.
 4. Limitations on copyright
 Nothing in this Licence is intended to deprive the Licensee of the
 benefits from any exception or limitation to the exclusive rights of the
 rights owners in the Work, of the exhaustion of those rights or of other
 applicable limitations thereto.
 5. Obligations of the Licensee
 The grant of the rights mentioned above is subject to some restrictions
 and obligations imposed on the Licensee. Those obligations are the
 following:
 Attribution right: The Licensee shall keep intact all copyright, patent or
 trademarks notices and all notices that refer to the Licence and to the
 disclaimer of warranties. The Licensee must include a copy of such notices
 and a copy of the Licence with every copy of the Work he/she distributes
 or communicates. The Licensee must cause any Derivative Work to carry
 prominent notices stating that the Work has been modified and the date of
 modification.
 Copyleft clause: If the Licensee distributes or communicates copies of the
 Original Works or Derivative Works, this Distribution or Communication
 will be done under the terms of this Licence or of a later version of
 this Licence unless the Original Work is expressly distributed only under
 this version of the Licence. The Licensee (becoming Licensor) cannot
 offer or impose any additional terms or conditions on the Work or
 Derivative Work that alter or restrict the terms of the Licence.
 Compatibility clause: If the Licensee Distributes or Communicates
 Derivative Works or copies thereof based upon both the Work and another
 work licensed under a Compatible Licence, this Distribution or
 Communication can be done under the terms of this Compatible Licence. For
 the sake of this clause, 'Compatible Licence' refers to the licences
 listed in the appendix attached to this Licence. Should the Licensee's
 obligations under the Compatible Licence conflict with his/her obligations
 under this Licence, the obligations of the Compatible Licence shall
 prevail.
 Provision of Source Code: When distributing or communicating copies of
 the Work, the Licensee will provide a machine-readable copy of the Source
 Code or indicate a repository where this Source will be easily and freely
 available for as long as the Licensee continues to distribute or
 communicate the Work.
 Legal Protection: This Licence does not grant permission to use the trade
 names, trademarks, service marks, or names of the Licensor, except as
 required for reasonable and customary use in describing the origin of the
 Work and reproducing the content of the copyright notice.
 6. Chain of Authorship
 The original Licensor warrants that the copyright in the Original Work
 granted hereunder is owned by him/her or licensed to him/her and that
 he/she has the power and authority to grant the Licence.
 Each Contributor warrants that the copyright in the modifications he/she
 brings to the Work are owned by him/her or licensed to him/her and that
 he/she has the power and authority to grant the Licence.
 Each time You accept the Licence, the original Licensor and subsequent
 Contributors grant You a licence to their contributions to the Work,
 under the terms of this Licence.
 7. Disclaimer of Warranty
 The Work is a work in progress, which is continuously improved by
 numerous Contributors. It is not a finished work and may therefore contain
 defects or 'bugs' inherent to this type of development.
 For the above reason, the Work is provided under the Licence on an 'as
 is' basis and without warranties of any kind concerning the Work,
 including without limitation merchantability, fitness for a particular
 purpose, absence of defects or errors, accuracy, non-infringement of
 intellectual property rights other than copyright as stated in Article 6
 of this Licence.
 This disclaimer of warranty is an essential part of the Licence and a
 condition for the grant of any rights to the Work.
 8. Disclaimer of Liability
 Except in the cases of wilful misconduct or damages directly caused to
 natural persons, the Licensor will in no event be liable for any direct
 or indirect, material or moral, damages of any kind, arising out of the
 Licence or of the use of the Work, including without limitation, damages
 for loss of goodwill, work stoppage, computer failure or malfunction,
 loss of data or any commercial damage, even if the Licensor has been
 advised of the possibility of such damage. However, the Licensor will be
 liable under statutory product liability laws as far such laws apply to
 the Work.
 9. Additional agreements
 While distributing the Work, You may choose to conclude an additional
 agreement, defining obligations or services consistent with this Licence.
 However, if accepting obligations, You may act only on your own behalf
 and on your sole responsibility, not on behalf of the original Licensor
 or any other Contributor, and only if You agree to indemnify, defend, and
 hold each Contributor harmless for any liability incurred by, or claims
 asserted against such Contributor by the fact You have accepted any
 warranty or additional liability.
 10. Acceptance of the Licence
 The provisions of this Licence can be accepted by clicking on an icon 'I
 agree' placed under the bottom of a window displaying the text of this
 Licence or by affirming consent in any other similar way, in accordance
 with the rules of applicable law. Clicking on that icon indicates your
 clear and irrevocable acceptance of this Licence and all of its terms and
 conditions.
 Similarly, you irrevocably accept this Licence and all of its terms and
 conditions by exercising any rights granted to You by Article 2 of this
 Licence, such as the use of the Work, the creation by You of a Derivative
 Work or the Distribution or Communication by You of the Work or copies
 thereof.
 11. Information to the public
 In case of any Distribution or Communication of the Work by means of
 electronic communication by You (for example, by offering to download the
 Work from a remote location) the distribution channel or media (for
 example, a website) must at least provide to the public the information
 requested by the applicable law regarding the Licensor, the Licence and
 the way it may be accessible, concluded, stored and reproduced by the
 Licensee.
 12. Termination of the Licence
 The Licence and the rights granted hereunder will terminate automatically
 upon any breach by the Licensee of the terms of the Licence.
 Such a termination will not terminate the licences of any person who has
 received the Work from the Licensee under the Licence, provided such
 persons remain in full compliance with the Licence.
 13. Miscellaneous
 Without prejudice of Article 9 above, the Licence represents the complete
 agreement between the Parties as to the Work.
 If any provision of the Licence is invalid or unenforceable under
 applicable law, this will not affect the validity or enforceability of
 the Licence as a whole. Such provision will be construed or reformed so
 as necessary to make it valid and enforceable.
 The European Commission may publish other linguistic versions or new
 versions of this Licence or updated versions of the Appendix, so far this
 is required and reasonable, without reducing the scope of the rights
 granted by the Licence. New versions of the Licence will be published
 with a unique version number.
 All linguistic versions of this Licence, approved by the European
 Commission, have identical value. Parties can take advantage of the
 linguistic version of their choice.
 14. Jurisdiction
 Without prejudice to specific agreement between parties,
 - any litigation resulting from the interpretation of this License,
  arising between the European Union institutions, bodies, offices or
  agencies, as a Licensor, and any Licensee, will be subject to the
  jurisdiction of the Court of Justice of the European Union, as laid
  down in article 272 of the Treaty on the Functioning of the European
  Union,
 - any litigation arising between other parties and resulting from the
  interpretation of this License, will be subject to the exclusive
  jurisdiction of the competent court where the Licensor resides or
  conducts its primary business.
 15. Applicable Law
 Without prejudice to specific agreement between parties,
 - this Licence shall be governed by the law of the European Union Member
  State where the Licensor has his seat, resides or has his registered
  office,
 - this licence shall be governed by Belgian law if the Licensor has no
  seat, residence or registered office inside a European Union Member
  State.
 Appendix
 'Compatible Licences' according to Article 5 EUPL are:
 - GNU General Public License (GPL) v. 2, v. 3
 - GNU Affero General Public License (AGPL) v. 3
 - Open Software License (OSL) v. 2.1, v. 3.0
 - Eclipse Public License (EPL) v. 1.0
 - CeCILL v. 2.0, v. 2.1
 - Mozilla Public Licence (MPL) v. 2
 - GNU Lesser General Public Licence (LGPL) v. 2.1, v. 3
 - Creative Commons Attribution-ShareAlike v. 3.0 Unported (CC BY-SA 3.0)
  for works other than software
 - European Union Public Licence (EUPL) v. 1.1, v. 1.2
 - Quebec Free and Open-Source Licence — Reciprocity (LiLiQ-R) or Strong
  Reciprocity (LiLiQ-R+)
 The European Commission may update this Appendix to later versions of the
 above licences without producing a new version of the EUPL, as long as
 they provide the rights granted in Article 2 of this Licence and protect
 the covered Source Code from exclusive appropriation.
 All other changes or additions to this Appendix require the production of
 a new EUPL version.
@@ -0,0 +1,89 @@
 # Notice
 ## Acknowledgements
 HellionChat is a fork of [Chat 2](https://github.com/Infiziert90/ChatTwo) by
 **Infiziert90 (Infi)** and **Anna Clemens**, both of whom kept that plugin
 running and maintained for years before I ever opened the source. Without
 their work this fork would not exist, full stop. I owe them the architecture,
 the message store, the channel filtering, the sidebar tab system, the
 hooks into FFXIV's chat, the localisation infrastructure, and countless
 small decisions that I only noticed because they had already been made
 correctly.
 If you find HellionChat useful, please remember that the foundation came
 from Chat 2. The code Anna and Infi wrote is doing most of the heavy
 lifting in this fork too.
 ## A direct word to Infi and Anna
 Hi. I am Florian (Flo, also Jon Kazama in-game on Phoenix). I forked Chat 2
 because I wanted a privacy-by-default version for my own use case and a
 small group of friends I play with, not because I thought I could do
 anything better than what you built. The opposite is true. ChatTwo's
 default of full history and cross-character logging is the right call for
 most users. I just have a different threat model and a different
 data-handling philosophy that fits a smaller, locally-stored, retention-
 limited approach.
 What HellionChat adds is mostly Hellion-specific surface area: a privacy
 filter, per-channel retention windows, an export pipeline, an Auto-Tell-
 Tabs feature for FFXIV club greeters, the Hellion theme and font, German
 localisation, and a settings UX rebuild. None of it touches the bones of
 what you built. Where I had to modify your code I tried to keep the
 edits minimal, isolated to clearly-marked Hellion files, and reversible.
 Concrete example: when API 15 hit, I cherry-picked your fix for the
 BetterTTV emote regression with `git cherry-pick -x` so authorship and
 co-author trail stay intact. That is the standard I want to keep using as
 long as both projects are alive. You should never have to look at this
 fork and wonder if I quietly ate your work.
 If anything in this fork ever steps on something you would not be okay
 with, please reach out and I will fix it. Genuinely. The list of contacts
 is below.
 ## Maintainer contact
 If something in HellionChat causes problems, especially if it relates back
 to Chat 2 or to anything Infi or Anna would want flagged:
 - **GitHub Issues:** [JonKazama-Hellion/HellionChat/issues](https://github.com/JonKazama-Hellion/HellionChat/issues)
 - **Discord:** `@j.j_kazama`
 - **Email (business):** maintainer@hellion-media.de
 I respond on weekdays during European business hours. For anything
 urgent (security, attribution, takedown), email is the fastest path.
 ## Why this fork is not upstreamed
 The privacy-by-default position fits a small audience. ChatTwo's
 full-history-by-default position fits a much larger one, including the
 roleplaying community where chat archive is part of the play experience.
 Trying to upstream HellionChat's defaults would have meant arguing that
 Chat 2's defaults are wrong, and they are not. They are right for the
 user base ChatTwo serves. So I keep the fork separate, attribute clearly,
 and pull selected upstream patches when they apply.
 ## Why HellionChat left the GitHub fork network
 The Dalamud plugin ecosystem treats the GitHub-Fork relation as a signal
 that a fork is either a development branch or a dead mirror. HellionChat
 is neither. It is an independently-maintained EUPL-1.2 fork with its own
 release cadence, its own custom repo, its own user base. Detaching the
 fork-network relation just makes the situation honest. The git history,
 the cherry-pick trail, and the attribution stay exactly the same. The
 only thing that changes is the GitHub UI no longer says "forked from".
 ## Trademarks and naming
 "Chat 2" and "ChatTwo" are the names Infi and Anna chose for the upstream
 plugin. HellionChat does not use either of those names in user-facing
 copy except where required to describe origin (settings tab, manifest,
 this file, the README). The Hellion brand is mine.
 ## Questions
 This file is the canonical place for "is this attribution correct, is the
 maintainer reachable, is the relationship to Chat 2 documented". If
 anything in here is wrong, please open an issue or contact me directly.
@@ -1,10 +1,14 @@
 # Hellion Chat
-**Version 0.3.1** — DSGVO-bewusste Erweiterung von [Chat 2](https://github.com/Infiziert90/ChatTwo) für FINAL FANTASY XIV / Dalamud.
+**Version 0.5.1** — DSGVO-bewusste Erweiterung von [Chat 2](https://github.com/Infiziert90/ChatTwo) für FINAL FANTASY XIV / Dalamud.
 Hellion Chat baut auf Chat 2 auf und ergänzt es um Datenschutz- und Daten-Handling-Kontrollen, die mit den Datenschutz-Regeln in der EU, den USA und Japan im Einklang sind. Alle Chat-2-Funktionen, Befehle und Tastenkürzel funktionieren unverändert. Eigenständiger Plugin-Slot, eigene Konfiguration, eigene Datenbank.
-Privates Repository, EUPL-1.2-lizenziert. Distribution über Custom-Repo während der Bootstrap-Phase.
+Eigenständiges Repository, EUPL-1.2-lizenziert. Distribution über Custom-Repo. Selektive Cherry-Picks von Upstream-Chat-2 nach Bedarf, dokumentiert in [UPSTREAM_SYNC.md](UPSTREAM_SYNC.md).
 ## Acknowledgements
 Hellion Chat baut auf [Chat 2](https://github.com/Infiziert90/ChatTwo) von **Infiziert90 (Infi)** und **Anna Clemens** auf, die das Plugin über Jahre gepflegt haben bevor ich den Source-Code überhaupt gesehen habe. Die ganze Kern-Architektur, der Message-Store, die Channel-Logik, das Hook-System und vieles mehr stammt von ihnen. Wenn dir Hellion Chat hilft, dann läuft die Anerkennung dafür zu großen Teilen an Infi und Anna. Eine ausführliche Danksagung liegt in [NOTICE.md](NOTICE.md).
 ---
@@ -265,7 +269,7 @@ Phase 3 (offen, kein festes Datum):
 ## Lizenz
-EUPL-1.2 (gleiche Lizenz wie Upstream Chat 2). Siehe `LICENCE`.
+EUPL-1.2 (gleiche Lizenz wie Upstream Chat 2). Volltext liegt in [LICENSE](LICENSE), persönliche Danksagung an die Upstream-Autoren in [NOTICE.md](NOTICE.md).
 © 2023–2026 die Chat-2-Autoren (Infi, Anna und die Upstream-Contributors) für die Engine, IPC und Storage-Schicht.
 © 2026 Hellion Online Media für die Hellion-Chat-Erweiterungen.
@@ -0,0 +1,110 @@
 # Upstream sync workflow
 HellionChat is a standalone EUPL-1.2 fork of [Chat 2](https://github.com/Infiziert90/ChatTwo).
 We pull selected patches from upstream manually instead of running an
 automated mirror. This file documents how that works so anyone (including
 future-me) can do it cleanly.
 ## One-time setup
 Add the upstream repo as a remote on a fresh clone:
 ```bash
 git remote add upstream https://github.com/Infiziert90/ChatTwo.git
 git fetch upstream
 ```
 Verify both remotes are wired up:
 ```bash
 git remote -v
 # origin    https://github.com/JonKazama-Hellion/HellionChat.git (fetch)
 # origin    https://github.com/JonKazama-Hellion/HellionChat.git (push)
 # upstream  https://github.com/Infiziert90/ChatTwo.git (fetch)
 # upstream  https://github.com/Infiziert90/ChatTwo.git (push)
 ```
 You never push to `upstream`. It is read-only for us.
 ## Reviewing what is new upstream
 Before any feature cycle starts I run a quick check:
 ```bash
 git fetch upstream
 git log --oneline main..upstream/main | head -30
 ```
 That shows every commit Infi or contributors landed since the last sync.
 Read the messages, decide which ones apply.
 ## What we cherry-pick
 **Always:** security fixes, API-version compatibility patches (Dalamud
 API 15 → 16 → ...), BetterTTV / emote-cache fixes, regression fixes for
 the upstream behaviour we still rely on.
 **Sometimes:** small bug fixes in `MessageManager.cs`, `MessageStore.cs`,
 `ChatLogWindow.cs`, the Tabs system. Pull them when they touch code we
 have not heavily modified.
 **Never:** webinterface changes (the entire webinterface tree is gone in
 HellionChat), changes that conflict with the privacy filter, changes that
 re-add upstream defaults we deliberately reversed (full-history logging,
 Tell Exclusive defaults, etc.).
 ## How we cherry-pick
 Always with `-x` so authorship and the original commit hash stay
 visible:
 ```bash
 git checkout -b sync/upstream-<topic> main
 git cherry-pick -x <upstream-commit-sha>
 ```
 `-x` adds a `(cherry picked from commit <sha>)` line to the commit
 message. That preserves the upstream-author credit and lets anyone
 reading `git log` trace the change back to ChatTwo. Co-Author trail
 intact, no AI lines, no "Hellion" prefix on commits that were not
 authored by us.
 ## Conflict handling
 When a cherry-pick conflicts:
 1. Resolve the conflict by hand. Do not "fix" upstream code to match
   Hellion conventions; that is what the merge marker showed us.
 2. If the conflict is fundamental (touches code that no longer exists
   in our fork), abort the cherry-pick and document why in
   `Hellion Chat Backlog.md` instead. Some upstream patches are not
   portable; that is fine.
 3. After a successful resolve, the commit message stays identical to
   the upstream message, with the `-x` cherry-pick footer Git appends
   automatically. Do not rewrite the message to match our format.
 ## Pushing the sync
 Cherry-picked commits go through the same review as our own work: the
 sync branch lands in `main` via a no-fast-forward merge, then a release
 tag if the user-visible behaviour changes (otherwise just merged).
 ```bash
 git checkout main
 git merge --no-ff sync/upstream-<topic> -m "merge: upstream sync — <topic>"
 ```
 ## When upstream goes silent
 If Chat 2 stops receiving updates entirely we keep this workflow alive
 anyway. The remote stays configured, the documentation stays here. The
 moment maintenance picks back up we are ready to pull again.
 ## When upstream takes a direction we cannot follow
 If a future ChatTwo release breaks compatibility with our privacy
 philosophy in a way we cannot resolve (e.g. mandatory cloud sync,
 removal of the local message store, a license change that makes EUPL
 incompatible), HellionChat continues on its own from the last
 compatible cherry-pick. The history we already inherited stays under
 EUPL-1.2 and stays attributed.