Remove packaged runtime repository dependency

docs/platform-portability.md

@@ -18,6 +18,9 @@ The VM and content pipeline are already mostly platform-neutral:
 - Native-compatible persistence uses managed streams behind `INativeDatStore`; Godot redirects AGE's
   related save/settings profile to `user://`, yielding `user://SAVE` and `user://SYS4REG.INI` while
   retaining native filenames and formats.
+- The Himegari Godot assembly embeds generated `build/opcodes.json` as profile runtime metadata. Exported
+  builds never search for an `age-reimpl` repository ancestor; their automatic page-map diagnostics live
+  under `user://diagnostics/page-maps`, while editor/development runs retain the workspace `build/` handoff.
 
 The sole movie path now uses the project-owned FFmpeg C ABI rather than a Windows multimedia API, but only a
 Windows-x64 native bundle is built and staged today. The accepted DirectShow fallback was deleted after the
@@ -36,7 +39,7 @@ or replaced before claiming portable exports.
 | ADV font discovery/raster fidelity | `Age.Engine.Text` remains OS-neutral. On compatible ACP-932 Windows, `auto` selects the separate exact `Age.Engine.Text.Windows` GDI gray-4 backend. Otherwise Godot TextServer supplies Unicode masks and metrics from ordered system-font substitutions in `godot/config/himegari-text-rendering.json`; this policy is explicitly not GDI pixel-exact. Immediate `0x204`/`0x205`, live ADV, retained History, and the wait atlas all enter ordinary RGBA surfaces/retained handles | Three Mincho/Gothic regular/bold samples byte-match an independent Unicode GDI oracle. Forced exact and forced portable self-tests cover immediate, live, and History rasterization, bounded caching, complete-line materialization, retained ordering, alpha/tint/fade, transforms, clipping, capture, HIDEWIN suspension, partial erase/republication, reset, and teardown. Gameplay `Label` pools and overlay projection are gone | Produce and smoke-test Linux/macOS exports, confirm installed family availability/fallback selection there, and keep the GDI project out of non-Windows deliverables |
 | Filesystem semantics | Several filename and containment comparisons use `OrdinalIgnoreCase`; installed assets are conventionally uppercase | Needs validation on case-sensitive filesystems; may hide casing or containment mistakes | Add Linux/macOS tests with mixed-case synthetic roots and use filesystem-appropriate containment rules |
 | Save/profile/settings storage | `Sys4PersistencePaths` models AGE's independent `SAVEPATH` and `REGFILEPATH` resolutions. Godot replaces Himegari's related profile directory with `user://`, yielding `user://SAVE` for native S3SD/S4SD/S3RT files and thumbnails plus `user://SYS4REG.INI` for the BOM-less CP932 options file; the preserving writer changes only its nine `[sound]` keys | Save payloads and engine options are isolated together without changing either native format. Native/drop-in resolution remains available through `USEAPPDATAFOLDER` plus both SYS4INI paths. A single-root override is rejected when `SAVEPATH` is not beneath `REGFILEPATH`, preventing cross-profile guesses | Expose explicit profile/native selection through the future launcher and allow independent overrides for profiles whose two native paths are unrelated. Validate CP932 availability, replace/flush, case, permissions, and interrupted-write behavior on each export target |
-| Game-install and repository discovery | `GameRootSelection` accepts `--game-root`, then probes the executable directory and current working directory for `SYS4INI.BIN`; on Unix the frontend prefers inherited shell `PWD` because Godot may change the process directory during project startup. Godot injects the selected root into its catalog and loose-first ALF store. `Paths.cs` remains the development/test locator for generated opcode data, diagnostics, and CLI conveniences | Installed game data no longer depends on the workspace sibling layout, enabling an executable beside `AGE.EXE`, a terminal launch from the install, or a launcher-supplied absolute profile root. A packaged export still needs its generated runtime metadata bundled independently of repository discovery | Add export packaging for the opcode/profile artifacts, let the future profile launcher pass `--game-root`, and run executable-directory/CWD plus case/permission smoke gates on Linux and macOS |
+| Game-install, runtime metadata, and repository discovery | `GameRootSelection` accepts `--game-root`, then probes the executable directory and current working directory for `SYS4INI.BIN`; on Unix the frontend prefers inherited shell `PWD` because Godot may change the process directory during project startup. Godot injects the selected root into its catalog and loose-first ALF store. `Himegari.csproj` embeds generated `build/opcodes.json`, and the frontend loads that assembly resource rather than `Paths.OpcodesJson`. `Paths.cs` remains a development/test locator; its page-map use is compiled only for `TOOLS` builds | Installed game data and packaged VM metadata no longer depend on the workspace sibling layout. An executable can sit beside the game, inherit a terminal-launched install directory, or receive a launcher-supplied absolute profile root. Exported automatic page maps use `user://diagnostics/page-maps`; editor/development runs preserve `build/page-map-<SCENE>.jsonl` | Add the export preset/artifact pipeline, let the future profile launcher pass `--game-root`, and run executable-directory/CWD plus case/permission smoke gates on Linux and macOS |
 | Archive parity oracle | One integration test launches `bin/BinExtractALF.exe` | Windows-only test helper, not a shipped runtime dependency | Skip/replace on non-Windows CI; runtime ALF/AAI readers do not depend on it |
 | Native RE tools | Frida/Ghidra helpers target the original `AGE.EXE`; supporting utilities include Windows executables and Windows command conventions | Development/research only | Keep separate from export requirements; document platform prerequisites per tool |
 | Python workflow | Operating guide uses Windows `py -3.11` invocation | Developer workflow only | Add equivalent `python3` instructions if non-Windows development becomes active |