port: D184 — F10 port-layer options overlay (approach C)

New port/src/optionsoverlay.c + port/include/optionsoverlay.h: an
immediate-mode options overlay drawn as its own fast3d 2D display list,
appended after the game DL. Implements docs/dev/OPTIONS-MENU-PLAN.md §2/§3.

- config.c/h: configForEachOption() + configSetOptionMeta() label/step/enum
  side table; CONFIG_OPT_* enum. config.c stays free of specific-key knowledge.
- gfx_pc.cpp gfx_run(): one-line hook runs optionsOverlayEmit() after the game
  DL, before gfx_flush. Returns NULL when closed -> zero bytes appended, golden
  dumps byte-identical.
- video.c: F10 toggles (videoPumpEvents, next to F12); ESC closes; wheel
  scrolls; videoRequestLiveConfig()/liveCfgDirty re-applies VSync/FpsCap/
  TextureFilter at frame start.
- input.c: while open, controller 0 returns a neutral pad and nav
  (arrows/enter/wheel/mouse) routes to optionsOverlayHandleInput() — mirrors
  the D180 WI-1 swallow pattern.
- v1 rows: VSync, FpsCap, MSAA(restart), TextureFilter, MouseAimSpeed,
  MouseTurnSpeed, MouseInvertY, MouseCaptureMode, ScreenShakeIntensity.
  Live-apply where possible; configSave() on close.
- GE_OPTIONSOVERLAY=1 auto-opens at boot (env-gated diagnostic, left in).

Port-layer only, no src/ edits, no #ifdef PORT in game code. Build links
241/241. Runtime framediff/soak/eyeball owed on an interactive machine
(this headless env kills the GUI process early and writes 0-byte PPMs).

docs/dev/findings.md

@@ -400,6 +400,7 @@ covers D24–D69; the log continues in §H (D32 procedure, D70–D121).
 | D179 | **Packaged build crashes after the logos — the D43/D69 model + bg sidecars are ROM-derived and absent from any build that has no ROM (M-34, alpha-release QA).** The first `goldeneye-pc-port-*-win64.zip` from CI (bundle-win.sh) shows the Rare/Nintendo logos (compiled-in `assets/rarewarelogo.c`) then AVs at `0x6b157a88`/`0x70157a88` — symbolised: `modelPromoteNodeOffsetsToPointers` (`model.c`) ← `load_object_fill_header` (`objecthandler_2.c`) ← first prop/item model load. Root cause is **not** a code regression: the port loads PC-layout model geometry from `data/pcmodels-<region>/{pcmodels.bin,manifest.csv}` and stage bg/stan from `data/pccg-<region>/{pccg.bin,manifest.csv}`, both produced offline by `tools_pc/d43_emit.py` / `d69_emit.py` from the ROM (see `port/src/pcmodels.c` / `pccg.c`; `pcmodelsReserveSize` logs *"pcmodels.bin not found — model loads will fail"* and returns 0). CI has no ROM so it never runs the emit scripts, and the two `data/` dirs are (correctly) gitignored ROM-derived game data — **cannot be committed or shipped** (converted Nintendo/Rare geometry, DLs, collision, stan nav; = distributing assets). A local build with those dirs present runs clean (verified M-34: 1741 frames, `romdataInit ... mapped at 0x10000000`, `pcmodels: 512 sidecars`, `pccg: 73 sidecars`, no crash — so `0x10000000` is *not* the problem here). The `docs/building.md` sidecar-gen step was also missing entirely. **Fix = release-side, backlogged** (`docs/BACKLOG.md` → "Alpha release"): bundle the emit scripts + their committed inputs as a pure-stdlib-Python asset-prep tool the user runs once against their own ROM (~5 MB output, no MIPS toolchain). Secondary/latent: the fixed-address `VirtualAlloc((LPVOID)0x10000000)` in `romdata.c` has no working fallback (`"using heap copy — direct ROM reads will fail"` then limps into the same crash) — didn't bite M-34 but will on a machine where something occupies `0x10000000`; harden separately (reserve earliest in `main`, or retry low bases and derive all segment math from the base obtained). | Diagnosed, not fixed — release packaging gap + latent `romdata.c` fallback |
 | D180 | **Native-PC input pass (M-XX QoL run, `qol/native-pc-input-menu`, port-only).** Three parts, all config-gated with default = prior behaviour: **(WI-1) `Input.MouseCaptureMode`** (0 = legacy always-grab; 1 = Quake-style click-to-lock) in `port/src/input.c` + `port/src/video.c` — in mode 1 the OS cursor is free until a click lands in the game window (`SDL_MOUSEBUTTONDOWN` → `inputNotifyClick`), and ESC / focus-loss / entering any front-end menu (`current_menu != MENU_RUN_STAGE`) frees it again; re-entering a stage while still "armed" re-locks so unpausing needs no click. `reconcileGrab()` runs once per controller-0 poll. Mouse buttons are suppressed from the game while the cursor is free in-stage (no phantom fire). Controller paths untouched. **(WI-2) absolute-cursor menu tracking** — when capture mode is on and the cursor is free in a menu, the D165/D169 pointer P-controller takes its target from the real cursor's absolute window position mapped onto the live virtual front-end rect (`getPlayer_c_screen*`), giving true 1:1 tracking instead of the relative-delta estimator. Relative path unchanged for legacy/grabbed. **(B3) `Input.MouseAimSpeed` default 25 → 16** (aim mode still overshot at 25 per the backlog). | LANDED, port-only, no `#ifdef PORT`. Build 241/241, `-level_09` framediff 3/3 within threshold (unregressed), `GE_STARTMENU` menu boot crash-free. **Feel-checks owed** (headless can't drive the mouse): click-to-lock ergonomics, absolute menu tracking, the new aim-speed default. |
 | D181 | **`Game.ScreenShakeIntensity` — first route-(b) `src/` gameplay-cosmetic hook (M-XX QoL run).** `src/fr.c viShake()` gains a single `#ifdef PORT` line — `intensity *= portScreenShakeScale;` (extern `f32`, defined + `configRegisterFloat`'d 0.0–10.0 in `port/src/video.c`) — before the existing clamp. Default `1.0f` ⇒ exact no-op, every headless golden dump byte-unaffected; `0.0` disables explosion/effect screen shake, up to `10.0` exaggerates it. N64 build (no `-DPORT`) keeps the original line verbatim. Precedent per `docs/BACKLOG.md` "Fun features → screen-shake intensity slider" and AGENTS.md #2's documented-exception path. Same policy class as a future FOV hook. | LANDED behind config, default = original. Build green. |
+| D184 | **F10 port-layer options overlay — the approach-(C) surface from `OPTIONS-MENU-PLAN.md` (M-37).** New `port/src/optionsoverlay.c` + `port/include/optionsoverlay.h`: an immediate-mode overlay drawn as its own fast3d 2D DL, appended after the game DL in `gfx_pc.cpp gfx_run()` (`optionsOverlayEmit()` → NULL when closed ⇒ **zero bytes appended, golden dumps byte-identical**). F10 toggles (`video.c videoPumpEvents`, next to F12); while open, `input.c inputComputePad(0)` returns a neutral pad and routes arrows/enter/wheel/mouse-buttons to `optionsOverlayHandleInput()` (mirrors the WI-1/D180 swallow). ESC closes; `configSave()` on close. `config.c` gains `configForEachOption()` + a `configSetOptionMeta()` label/step/enum side table (no per-key knowledge in config.c). Live knobs (VSync/FpsCap/TextureFilter via `videoRequestLiveConfig()`; mouse + screen-shake via the registered pointer) apply immediately; MSAA tagged "(restart)". v1 rows per plan §3: VSync, FpsCap, MSAA, TextureFilter, MouseAimSpeed, MouseTurnSpeed, MouseInvertY, MouseCaptureMode, ScreenShakeIntensity. | **LANDED, port-only, no `#ifdef PORT` in `src/`.** Build links 241/241. **Runtime verification NOT run this session** — the headless env kills the GUI process after ~8 s and `gfx_opengl_dump_bound_fbo` writes 0-byte PPMs here, so framediff / 60 s soak / overlay-frame eyeball are all owed on an interactive machine. Overlay-closed no-op is code-evident (emit returns NULL before touching the DL buffer). |
 | D85 | room primary/secondary DL → `texLoadFromGdl` garbage | OPEN (safety-netted; widen/pool fixes landed, geometry now renders) |
 | D86 · D87 | modelInitRwData truncated ptr · attract-demo BE `ramromfilestructure` | resolved |
 | D88.1–D88.3 · D88.5–D88.6 | `Usetup*Z` header + sub-table width/endian conversion (`d88_emit.py`) | resolved |