chore: bootstrap Anvil repo skeleton

First commit on feature/v0.1.0 establishes the Hellion Forge plugin
scaffold:

- .gitattributes: Linux-first LF defaults, Windows-script CRLF exceptions,
  binary markers for fonts / images / archives. Pre-empts the
  Forgeimizer pre-push hook crash that was caused by Asriels CRLF default.
- .editorconfig: Hellion Forge .NET conventions
  (private fields _camelCase, Allman braces, var-preferred).
- .gitignore: VisualStudio baseline + secrets bucket + Anvil.Tests
  excluded (build-suite lives in the local Hellion Build test repo).
- LICENSE: MIT, Hellion Online Media 2026.
- NOTICE.md: goodwill attribution to Craftimizer and clean-room
  anonymisation note.
- PRIVACY.md: zero-telemetry statement matching 00-Anvil-Scope.
- README.md: v0.1.0 status + planned-feature outline + custom-repo URL.
- Anvil.sln + Anvil/Anvil.csproj: Dalamud.NET.Sdk/15.0.0, x64 platform
  pinned (forge-wide rule), Microsoft.Extensions.Hosting stack closed-range
  pin to 10.0.7 matching HellionChat v1.5.0. No DalamudPackager.targets
  override - SDK 15 default packager handles images / icon / image_urls.
- Anvil/Anvil.yaml: plugin manifest with explicit icon_url / image_urls
  (top-level fields required for SDK 15 default packager) and a v0.1.0
  changelog entry that names RecipeData as the first module.

NOTICE.md

@@ -0,0 +1,34 @@
+# NOTICE
+
+## Goodwill Attribution
+
+Anvil is an independent Hellion Forge plugin for FFXIV, built as a clean-room
+re-implementation. The plugin exists because the upstream Craftimizer plugin
+went dormant when the Dalamud SDK moved from API level 14 to 15.
+
+**Inspired by [Craftimizer](https://github.com/WorkingRobot/Craftimizer) by
+Asriel Camora (MIT).**
+
+This attribution is a goodwill marker, not a legal requirement. Anvil does not
+contain Craftimizer source code or paraphrased code patterns. The clean-room
+pipeline used official FFXIV game mechanics documentation, the
+[Artisan](https://github.com/PunishXIV/Artisan) plugin (as a mechanics
+reference for crafting domain values, with the "pattern and values may be
+adapted, no 1:1 code port" rule), and direct Lumina sheet inspection as the
+sole sources for the simulator and recipe data.
+
+## Crafting Domain Patterns
+
+Crafting mechanic constants (action CP/durability costs, condition multipliers,
+buff durations) are FFXIV game data and belong to Square Enix. The values were
+cross-checked against the publicly available datamining repository
+(`xivapi/ffxiv-datamining`) and against the Artisan plugin's documented
+constants. The Artisan plugin is GPL-3.0; Anvil does not port its code,
+only consumes its documented mechanic values which are themselves the
+underlying game's data.
+
+## Anonymisation Policy
+
+Anvil follows the Hellion Forge clean-room policy: no class names, method
+names, or code structures were imported from any external plugin. Namespace
+layout, type design, and threading model are independent.