Adds `uv.lock` as a supported `version-file` source. When `uv` is locked
as a
dependency in `uv.lock`, the action now installs the exact pinned
version,
closing the gap reported in #682.
This is useful for deterministic CI: the same uv version is used until
the
lockfile is updated, which avoids "CI worked yesterday, fails today"
drift and
reduces supply-chain exposure from auto-installing the latest release.
The implementation mirrors the existing `version-file` parsers — a new
`uv.lock`
entry in the parser registry reads the `[[package]]` whose `name = "uv"`
and
returns its locked `version`. Scoped to explicit `version-file:
uv.lock`;
workspace auto-detection is left as a possible follow-up to avoid
precedence
ambiguity with `uv.toml` / `pyproject.toml`.
Validation (local, Node 23; dist build is esbuild-deterministic):
- `npm run all` → build clean, biome clean, package clean, jest 77/77
- New tests: 3 unit (`uv-lock-file.test.ts`) + 1 integration — exact pin
resolves
through the full pipeline (`uv.lock` → `0.8.17`)
- dist rebuilt + committed (single bundle, no spurious churn)
related: #682
