PC port: phase 2 — D43 mechanical ABI edits + D46 buffer sizing + fast3d seg-5 case; converter spec validated (D47)

- bondtypes.h/model.c/chr.c/objecthandler_2.c/tex.c: PORT-guarded pointer-width
  and Gfx-size fixes (D43 step 2, uncommitted since prior session)
- front.c cast-screen bufferRemaining 0x1C000->0x25000, initmenus.c logo
  buffer 0x7C000->0x85000 (D46 strict bound)
- gfx_pc.cpp seg_addr: resolve raw 0x05xxxxxx via segmentPointers[5] + low24
  (unmarked segmented addresses, ROM convention)
- docs: D47 finding — converter contract finalized (compaction delta=R-P,
  accessors at 0x80090000, G_VTX GBI1 encoding, opcode-aware w1 remap rule,
  vertex formats, no embedded blobs, zero-vtx-array rule, staging contract,
  reload-hazard poolRemaining reset); HANDOFF rewritten around the remaining
  C implementation
- build-pc/d43_convert.py (gitignored, local): reference converter + validator —
  full N64->PC conversion spec run on all 512 ROM files, ALL CLEAN (max D_PC=0xB7E0)

AGENTS.md

@@ -48,6 +48,6 @@ Run `/linkcheck` for this sweep. Record new findings in `docs/PCPortResearch.md`
 - **Compile+link milestone:** all ~235 TUs compile and `ge007.x86_64.exe` links clean (`ninja ge007 -k 0`, 236/236). Findings D7–D17 in `docs/PCPortResearch.md` §11; asset stubs in `port/src/assetstubs.c`, fast3d no-ops in `port/src/gfxstub.c` (delete when real fast3d lands).
 - **Phase 1 (boot to window):** done — ROM loads/validates/maps at cart base 0x10000000 (`romdata.c`), SDL2 window + GL clear loop (`video.c`), absolute asset symbols from `scripts/gen_romassets.py` → `port/src/romassets_<r>.s` (findings D18–D23).
 - **Phase 1.5 (boot to first frame):** DONE — boot chain complete AND real frames render (`[NOTE] frame N rendered in … us`). D34–D42 closed the blockers on top of D31–D33: ANIM_DATA lvalues, music seq-table ABI+endianness, music-heap sizing, libaudio bank-tree re-layout, implicit-declaration prototype shim (D38), Globalimagetable rebasing + true segment size (D39), ModelHitEntry pool sizing (D40), cross-thread GL context release (D41), rsp task-settings toggle (D42). ROM dump verified against the No-Intro good dump (byte-identical, header CRCs re-checked — `tools_pc/romverify.c`).
-- **Phase 2 (rendering):** IN PROGRESS — fast3d integrated + first frames render; current blocker is **D43** (model-file loading ABI mismatch: N64-layout ROM model files read as 8-byte-pointer PC structs → D37-style re-layout in `port/src/romdata.c`; a Rare-validated near-analogue exists in the PD port's `preprocess/filemodel.c` — §2.4). **D43 investigation complete:** all 512 model files validated (opcodes, tiling invariants, GDL visit order), converter design + full implementation checklist in `docs/HANDOFF.md`; helper scripts in `build-pc/d43_*.py`. Recurring sub-task: ABI/layout fixes per the D32 procedure (§H) as more asset types are first touched (PD's `preprocess/` module already solves most of them).
+- **Phase 2 (rendering):** IN PROGRESS — fast3d integrated + first frames render; current blocker is **D43** (model-file loading ABI mismatch: N64-layout ROM model files read as 8-byte-pointer PC structs → D37-style re-layout in `port/src/romdata.c`; a Rare-validated near-analogue exists in the PD port's `preprocess/filemodel.c` — §2.4). **D43 status:** all 512 model files validated; buffer sizing finalized by the D46 overlap-safety analysis (strict bound from N64 ground truth); step-2 mechanical game-code edits APPLIED (uncommitted); **D47 closed every open converter question** — compaction state values, G_VTX encoding, opcode-aware remap rule, vertex formats, staging contract — and the full conversion spec is implemented + validated 512/512 by `build-pc/d43_convert.py` (max D_PC = 0xB7E0, ratio ≤ 1.31). Done this session: D46 buffer corrections (front.c 0x25000 / initmenus.c 0x85000) + fast3d seg_addr seg-5 raw-VMA case. Remaining: C implementation of `romdataFixupModelFile` in `port/src/romdata.c` (port d43_convert.py 1:1) + hook in load_object_fill_header (+ poolRemaining=0 reset), build + soak — full checklist in `docs/HANDOFF.md`; findings D47 in §F. Recurring sub-task: ABI/layout fixes per the D32 procedure (§H) as more asset types are first touched (PD's `preprocess/` module already solves most of them).
 - **Phase 3 (audio + input):** libaudio → SDL — largely copy-and-adapt from PD (`mixer.c` 722 lines vs our 31-line stub; `input.c` SDL_GameController backend; §2.4); decide the ASP strategy (C2: `aspMain*` dummies in `ucode.c`).
 - **Phase 4 (saves + polish):** file-backed EEPROM — build on PD's `fs.c` (file-backed save dir); PFS/motor already no-op stubs.