Fix pass Git config and lazy OTP commits

crates/storage/tests/fixtures/compatibility/README.md

@@ -30,6 +30,11 @@ password-store tree, and the expected plaintext. It deliberately lives outside
 the reproducible generator's `stores/`, `expected/`, and `repositories/`
 directories so a refresh cannot silently replace genuine GnuPG producer output.
 
+`pass-git-config.ini` records the local diff driver written by upstream
+`pass git init`. IronStorage preserves this configuration for repository
+compatibility, but its embedded Rust diff implementation never evaluates the
+driver or launches the configured GnuPG command.
+
 Rust tests parse keys, verify signatures, decrypt every entry, compare exact
 plaintext bytes, validate ciphertext digests, validate Git objects and refs,
 and materialize isolated stores and repositories. They never invoke `pass`,