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/ROADMAP.md

@@ -10,14 +10,35 @@ the plugin's privacy-first scope during brainstorming.
 
 ---
 
-## Next Cycle (v1.4.9)
+## Next Cycle (v1.4.10)
 
-**Plugin-Load Render Polish.** Erststart-Frame-Hitch (~110 ms UiBuilder) and the related Font-Atlas + Auto-Translate
-warmup costs surface every load and are reproducible in `/xlstats`. The cycle also unblocks the lazy-window refactor
-sketched in `feedback_lazy_window_dalamud` and the slash-command centralisation that comes with it.
+**Render Clipper, Symbol-Picker and Final-Cleanup.** Reserve items inherited from the v1.4.9 plan that did not need to
+land in the HITCH-cut: an `ImGuiListClipper` for variable-height messages in `DrawMessages` (the OtterGui `ImGuiClip.cs`
+wrapper is the idiom anchor), a Symbol Picker popup for the chat input (`imgui_demo.cpp` Popups & Modal Windows section
+is the pattern reference), plus the carry-over from v1.4.9: structural First-Frame-Layout rewrite if the v1.4.9 selective
+defers turn out to be too narrow once user-side regressions surface. Lazy-Window-Init naive is **not** in scope — the
+v1.4.9 Stage-2 diagnose falsified that path (`WindowSystem.windows` is non-thread-safe, Game-Freeze under reload stress,
+no measurable HITCH delta). A clean DI-container adoption (Lightless `PluginHostFactory` pattern) belongs in v1.5.x and
+will revisit the question with the right threading model.
 
 ---
 
+## v1.4.9 — Plugin-Load Render Polish (released 2026-05-15)
+
+Tenth sub-patch of the v1.4.x Polish Sweep series. First-frame HITCH drops from ~127 ms median to ~76 ms median (4-reload
+sample), comfortably under Dalamud's 100 ms warning threshold. Mechanism: a single `_firstFrameDone` flag inside
+`ChatLogWindow` defers six non-essential rendering sections (bottom status bar, channel-name SeString chunks, window
+bounds check, v0.6.1 hint banner, autocomplete, input-preview calculation) from frame 0 to frame 1. User sees those
+sections ~17 ms (60 fps) later, invisible inside the ~2.5 s font-atlas build window after every reload. Slash-command
+registration moved from individual window constructors to a central `SetupCommands` / `TearDownCommands` pair in
+`Plugin.cs` — `/hellion`, `/hellionView`, `/hellionSeString` and `/hellionDebugger` work before their target windows are
+opened the first time, and Dalamud's plugin-manager `OpenConfigUi` / `OpenMainUi` buttons hang on the same path.
+Plugin-load profiling logs (auto-translate warmup, `MessageStore.Connect`, `MessageStore.Migrate`, `FilterAllTabs`) stay
+on at Information level as a regression tripwire. Migration v17 stays (no schema bump). Hypothesis-triage falsified
+three of four candidate root causes (font-atlas sync fallback, theme-apply ABGR-cache init, multiple-window render via
+lazy-init) — actual cost distributes evenly across ~10 ImGui sections inside ChatLogWindow, so structural rewrite is
+deferred to v1.5.x DI-container cycle.
+
 ## v1.4.8 — Hook-Layer and Polish Quick-Wins (released 2026-05-14)
 
 Ninth sub-patch of the v1.4.x Polish Sweep series. Database Viewer gains an optional FTS5 full-text search across the