chore: drop stale uv.lock (#1604)

`pyproject.toml` has `dependencies = []` since #1554 deleted the
Python tree — the wheel ships a single Rust binary and has no
runtime Python deps. `uv.lock` is left over from the pre-port
state, still locking ~50 transitive deps (`aiofiles`, `anyio`,
`click`, ...) that nothing in the repo references. Renovate keeps
opening "bump ruff in uv.lock" PRs for a lock file that locks
nothing reachable.

No code change anywhere — `grep -r 'uv\.lock\|uv sync\|uv run'`
across the repo (AGENTS.md, README.md, .github/, .mergify.yml,
renovate.json) returns zero hits. Delete the file; Renovate stops
churning.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: jd