Add-git seeds a minimal .gitignore (.DS_Store) before the initial
stage — the seed rides "Initial board state" and .DS_Store never
enters history; an existing .gitignore (or a directory wearing the
name) is left alone forever, adoption and repo-nested seed nothing.
GitHousekeeping is the periodic loose-object repack: filesystem
enumeration of objects/<2hex>/<38hex> (never git_odb_foreach, which
would rewrite the whole database into a fresh pack each pass),
git_packbuilder_insert one oid at a time, additive pack write — and
deletion only after each oid is re-verified against the written
pack opened as a standalone one-pack odb with no loose backend. Any
failure returns before deleting; the worst case is a stray pack.
Nothing prunes, expires, or consolidates — existing packs
accumulate, recorded as the accepted cost of never rewriting
storage the app didn't write. GitHousekeeper schedules it: git's
own 6700 threshold, 8s after session activation (outlasting the
launch catch-up), background priority, skipped under pause states,
held locks, or an in-flight commit, never retried — the next open
tries again. Free tier composes none of it.
20 new tests: full-odb equality, per-oid survival, identical walks,
byte+mtime-identical refs/HEAD/working tree, whole-.git identity on
every declined pass, and deleting-never-forgets. 2394 tests / 412
suites green; InertGitTests untouched. Closes pro-m1-git-undo.
Claude-Session: https://claude.ai/code/session_01SR4XGjmBE16ZUYWpfFHXwY
