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CLAUDE.md

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+# CLAUDE.md
+
+Batman: Arkham City (PC) audio toolkit + editor. Read `NOTES.md` first (status, next steps, environment).
+
+- Layout: `ackit/` library + CLI (`python -m ackit -h`), `app/` PySide6 editor, `tests/` pytest, `data/catalog/`
+  CSVs (+ user's original lists in `data/catalog/source/`, never edit them), `docs/`, `tools/` build scripts.
+- Dev env: `.venv` (Python 3.14, `pip install -e .[app,dev]`). Run tests with `.venv/Scripts/python -m pytest -q`.
+- Writing game files goes through `ackit.workspace.Workspace` only (originals store, atomic writes, conflict checks).
+  Speech/ambience: in place, never larger than the original WEM; music packs: any size (`docs/formats/wad.md`).
+- Never use Steam "verify integrity". Keep game files original after tests (`ackit status`, `ackit revert --all`).
+- Real-game checks: `ackit verify` (offline), `ackit verify --ingame` (Windows; needs Steam running and logged in,
+  WinDbg; ~1.5 min; reverts and checks byte-identity itself).
+- Rebuild catalogs only from original game files: `python tools/build_catalog.py`.
+- Shell: git at `C:\Program Files\Git\cmd` (prepend to PATH). Write Python with the Write/Edit tools; avoid
+  PowerShell here-strings and heredoc string surgery with backslash escapes (they produced NUL bytes before).
+- The speaker loopback can contain other apps' audio (voice chat): never save raw captures.