chore: bump version to 1.4.9, sync manifest

Manifest version bump for the v1.4.9 release cut. Schema-required v16
stays unchanged (R1/R2/R3 are all config-neutral refactors).

Files touched:
- HellionChat/HellionChat.csproj: <Version> 1.4.8 -> 1.4.9
- HellionChat/Plugin.cs: schema-migration error string self-reference
  (v1.4.8 -> v1.4.9, required schema v16 stays)
- repo.json: AssemblyVersion, TestingAssemblyVersion, 3x DownloadLink*
  URLs all bumped to 1.4.9 / v1.4.9. Changelog field is still on v1.4.8;
  the v1.4.9 block plus v1.4.5 slim-drop land in the next commit.
- README.md: shield badge, version header in lead paragraph, project-
  status block rewritten for v1.4.9 (Plugin-Load Render Polish).
- docs/CHANGELOG.md: v1.4.9 block inserted above v1.4.8.
- docs/ROADMAP.md: v1.4.9 moved into the released-versions list,
  "Next Cycle" header now targets v1.4.10 (Render Clipper + Symbol
  Picker reserves carried over from the v1.4.9 plan).

yaml changelog block and repo.json Changelog field follow in the
docs commit so the slim-drop of v1.4.5 stays atomic with the v1.4.9
block insert.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

docs/CHANGELOG.md

@@ -10,6 +10,35 @@ to the release pages for details.
 
 ---
 
+## Hellion Chat 1.4.9 — Plugin-Load Render Polish (2026-05-15)
+
+Tenth sub-patch of the v1.4.x polish-sweep series. First-frame render cost drops from ~127 ms median down to
+~76 ms median — comfortably under Dalamud's 100 ms HITCH warning threshold. The remaining ~13 ms gap to ChatTwo
+upstream (~63 ms median) is the cost of HellionChat-only features (sidebar tab view, custom status bar,
+Honorific integration).
+
+- First-frame defer: six non-essential rendering sections inside `ChatLogWindow` skip their first Draw and run
+  one frame later. Covered sections are the bottom status bar, channel-name SeString chunks, window bounds
+  check, v0.6.1 hint banner, autocomplete and input-preview calculation. At 60 fps the user sees those sections
+  ~17 ms after plugin reload — invisible inside the ~2.5 s font-atlas build window every reload runs through
+  anyway. Frame 1 stays well under 100 ms too (~40 ms), so no secondary HITCH warning appears.
+- Slash-command centralisation: `/hellion`, `/hellionView`, `/hellionSeString` and `/hellionDebugger` are now
+  registered during `LoadAsync` instead of inside the corresponding window constructors. The commands work
+  before their target window is opened the first time, and Dalamud's plugin-manager configuration / open
+  buttons (`UiBuilder.OpenConfigUi` / `OpenMainUi`) hang on the same path.
+- Plugin-load profiling logs stay on: `MessageStore.Connect`, `MessageStore.Migrate`, `FilterAllTabs` and the
+  auto-translate warm-up timing log are now Information level rather than Debug. They serve as a tripwire so a
+  future regression past 100 ms shows up directly in `/xllog` without re-enabling Debug.
+- Migration v17 stays (no schema bump).
+- Internal: hypothesis-triage during the R2 cycle falsified three of the four candidate root causes
+  (font-atlas sync, theme-apply ABGR-cache init, multiple-window render). Actual cause is `DrawList` setup
+  cost distributed across ~10 ImGui sections inside ChatLogWindow (5-20 ms each). The six selective defers
+  above are the pragmatic fix — a clean structural rewrite would belong in the v1.5.x DI-container cycle.
+
+Based on Chat 2 1.35.3 (upstream Infiziert90/ChatTwo, EUPL-1.2).
+
+---
+
 ## Hellion Chat 1.4.8 — Hook-Layer and Polish Quick-Wins (2026-05-14)
 
 Ninth sub-patch of the v1.4.x polish-sweep series. Hook-layer cluster (FTS5 full-text search, ad-block foundation