feat(a2b): asset-RE tooling + findings; render blocked on asset resolution

- tools/convert_agf.py (AGF->BMP stills), tools/frida/ (capture harness + README; Frida 17.15.3)
- docs/asset-resolution-re.md: foundational RE steering doc (resId->file; graphics+audio; not
  machine-verifiable -> Frida ground truth + human oracle). RE plan: parse SYS4INI, crack resId->name,
  backend render (A2b plan Tasks 3-5), audio, movies.
- Finding: SC0000 bg = slot-0 slideshow (res 0x23 first); resolution opaque (CGINIT not a name map,
  SYS4INI S4IC needs RE, Frida file-I/O noisy/memory-mapped, opening mixes MPEG movies).
- slice plan updated; texture ops already engine-driven (Task 1, prior commit).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

tools/convert_agf.py

@@ -0,0 +1,33 @@
+#!/usr/bin/env python3
+"""Convert named AGF files (in extracted/DATA2 or DATA5) to BMP via AGF2BMP2AGF.exe,
+into build/textures/. Run: py -3.11 -X utf8 tools/convert_agf.py EV001AA.AGF ..."""
+import os, sys, shutil, subprocess
+sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
+import paths
+
+EXE = paths.EXTRACTED / "DATA1" / "AGF2BMP2AGF.exe"  # tool lives in extracted/DATA1
+SRC_DIRS = [paths.EXTRACTED / "DATA2", paths.EXTRACTED / "DATA5"]
+OUT = paths.BUILD / "textures"
+
+def find(name):
+    for d in SRC_DIRS:
+        p = d / name
+        if p.exists():
+            return p
+    return None
+
+def main(argv):
+    OUT.mkdir(parents=True, exist_ok=True)
+    for name in argv:
+        src = find(name)
+        if not src:
+            print(f"NOT FOUND: {name}"); continue
+        tmp = OUT / name
+        shutil.copy(src, tmp)
+        subprocess.run([str(EXE), name], cwd=str(OUT), check=True)
+        tmp.unlink(missing_ok=True)  # drop the copied .AGF, keep the .BMP
+        print(f"converted {name} -> {OUT / (os.path.splitext(name)[0] + '.BMP')}")
+    return 0
+
+if __name__ == "__main__":
+    sys.exit(main(sys.argv[1:]))