zit 0.14.1

zit 0.14.1 makes annotate cheap at any limit once a file has been annotated, and about a third cheaper the first time.

This release is from trunk. Stores and the wire are unchanged from 0.14.0. One cache is added beside each store and is filled as annotate runs; nothing is rebuilt on upgrade.

annotate

• A diff cache. annotate keeps, per file, the line diff between each pair of consecutive versions it has walked, in .zit-cache/diff, keyed by the two versions' content hashes. A later annotate of that file, at any -n limit or none, replays those diffs instead of recomputing them, and a version whose diffs are all cached is not read at all. The answer is the same, byte for byte: a diff depends only on the two contents and the diff options, and both are part of the key. This also covers the case 0.14.0 could not answer from the blame cache, a window holding a version whose primary parent is outside it and a merge parent inside it. On a 32,500-line file with 1,700 versions, after one walk:

	0.14.0	0.14.1
annotate -n 40	0.59 s	0.09 s
annotate -n 50	0.67 s	0.10 s
annotate -n 100	1.38 s	0.15 s

The cache is capped at 4 MB per file, and a damaged or inconsistent file is ignored and rewritten, never trusted.

• Each version is split into lines once. The diff engine (the port of Fossil's diff.c) split every version twice, once as the newer side of one diff and once as the older side of the next. A first, uncached annotate costs about 15% to 40% less: on the same file -n 40 went from 0.57 s to 0.48 s, and an unlimited annotate from 10.6 s to 6.4 s.

A version answered entirely from cached diffs is not read. Content removed by policy (purge, shun, a signed erasure) still refuses as before, because the cache is keyed to the same fingerprint as the blame cache. But content that vanished from the store with no such record, which only store damage does, is no longer noticed by annotate. zit verify is the check for that.

Compatibility

Stores, check-ins, the sync protocol and the daemon protocol version are unchanged. The new .zit-cache/diff directory is advisory: deleting it costs only speed, and an older zit ignores it.

Qualification

The release manifest records native qualification against the exact tagged source archive on macOS ARM64, Linux x86-64 and Linux ARM64, using the pinned Zig 0.17.0 toolchain. Publication is gated on unit and end-to-end tests, Git differentials, deterministic simulation, seeded fuzzing, and Fossil interoperability checks on every distributed target.

For the basis of the conformance claim, see the 0.1.0 release notes.