# 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,verify]`). 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`).
  In-memory sounds (archive BANK, loose `.bnk` + `.upk` packages): in place into every copy; a bank file is always
  rebuilt from the store's original copy + the applied replacements (`docs/formats/banks.md`, `upk.md`).
  Texts go through `Workspace.texts` (subtitles in packages, in place and NUL-padded; menu `.int` files).
- Never use Steam "verify integrity". Keep game files original after tests (`ackit status`, `ackit revert --all`).
- Real-game checks: `ackit verify` (offline), `ackit verify --catalog [--quick]` (catalog vs game files),
  `ackit verify --ingame [--banks | --texts]` (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` (~5 min, scans all packages).
- 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.