Module inventory 

SHA-validated ahead/behind memo store.

One JSON file per git common-dir lives at ~/.open-loops/inventory/<fnv64hex>.json. The heavy git phase (rev-list) is memoised per (branch, head_sha, ab_base_sha) pair. Reads are tolerant; writes are atomic (tmp → rename).

Structs

InventoryFile

Per-repo inventory file serialised to JSON.

InventoryStore

Thin wrapper around the inventory directory.

LoopMemo

One memoised ahead/behind entry for a branch.

Functions

common_dir_hash

FNV-1a 64-bit hash of the absolute common-dir path, returned as 16 hex chars.

lookup_ahead_behind

Looks up the cached ahead/behind for a branch, validating SHA keys and TTL.