Add Ehwrj clean-room live map

docs/feature-matrix.md

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+# Feature Matrix
+
+This matrix tracks the benign functionality identified from the analyzed WT Live Map resource and the corresponding clean-room Ehwrj implementation.
+
+| Feature | Ehwrj status | Notes |
+| --- | --- | --- |
+| Local War Thunder map polling | Implemented | Reads `map_info.json`, `map_obj.json`, and `map.img` from loopback. |
+| Map image preview | Implemented | Drawn by `MapCanvas`. |
+| Aircraft/object markers | Implemented | Uses `MapObjectKind` classification for player, ally, squad, enemy, and objective colors. |
+| Ally/enemy aircraft counters | Implemented | Derived from parsed object kind and aircraft flags. |
+| Player info panel | Implemented | Shows detected player name, map position, Mach, and heading when available. |
+| Flight telemetry | Implemented | Optional `/state` support for TAS/IAS, altitude, vertical speed, Mach, and climb angle. |
+| Battle timer | Implemented | Session-local timer starts on first live snapshot. |
+| Battle log panel | Implemented | Reads optional `/hudmsg` and `/gamechat` when available, and also logs local snapshot events. |
+| Labels | Implemented | Toggle-controlled map labels. |
+| Aircraft Mach labels | Implemented | Uses tracked motion estimates or state-derived values when present in parsed data. |
+| Follow player | Implemented | Main map zoom/pan centers the detected player. |
+| Rotate with player | Implemented | The map bitmap, grid, markers, range rings, and delivery tracker rotate around the view center using detected player heading. |
+| Range rings | Implemented | Drawn around detected player. |
+| Delivery tracker | Implemented | Draws projected approach lines from friendly/player aircraft to enemy objective targets when heading alignment passes the configured threshold. |
+| Transparent overlay | Implemented | Avalonia transparent window with Windows click-through interop. |
+| Overlay minimap | Implemented | Includes aircraft scale and minimum Mach filtering. |
+| Overlay spot radar | Implemented | Includes range, spread, vertical scale/offset, opacity, arrow size/outline/color, and distance/Mach/closure labels. |
+| Settings persistence | Implemented | Stored in `%LOCALAPPDATA%\Ehwrj\settings.json`. |
+| Local API capture/replay | Implemented | `Ehwrj.Tools.Capture` records fixtures and writes a validation report; `LocalApiStub --fixture-dir` replays them. |
+| Language selection | Implemented | English and Korean UI text can be selected from the main control panel and persists in settings. |
+| WebView2 host | Intentionally not used | Avalonia was chosen so Ubuntu ARM64 can build and publish Windows x64 artifacts without WindowsDesktop SDK support. |
+
+## Known Data Gaps
+
+Real War Thunder `map_obj.json`, `map_info.json`, `/state`, `/hudmsg`, and `/gamechat` captures are still needed to tune distance scale, object classification edge cases, and mode-specific fields. The local API stub covers development and UI testing but is not a replacement for game-mode validation.