chore: bump version to 2.1.20 — cuts CI-unblocking release (exec bit + warm-build P0)

[zackees]

Summary

Cuts 2.1.20 with the two P0 fixes merged since 2.1.19. Both are currently blocking every FastLED uno build on GitHub Actions:

• fix(build): P0 regression — Operation not permitted (os error 1) on warm build #134 — P0 regression: Operation not permitted (os error 1) on warm build
• fix(ci): preserve exec bit on fbuild console script in wheel #135 — fix(ci): preserve exec bit on fbuild console script in wheel

Symptom on CI (from https://github.com/FastLED/FastLED/actions/runs/24621693195):

/opt/hostedtoolcache/Python/3.12.13/x64/bin/fbuild: Permission denied
fbuild --version not yet supported on this release
...
FAILED: Blink
build error: build failed: io error: Operation not permitted (os error 1)
FAILED: Cylon
...

2.1.19's wheel installs the fbuild console script without +x, so CI can't even run fbuild --version; then every example compile fails with the warm-build os error 1.

Also included (2.1.19 → 2.1.20)

• style: apply rustfmt to lnk pipeline files #131 style: rustfmt on lnk pipeline files
• fix(packages): migrate older DiskCache schemas to add leases.refcount #133 fix(packages): migrate older DiskCache schemas to add leases.refcount
• perf(daemon): watch-set cache hit/miss telemetry #127 perf(daemon): watch-set cache hit/miss telemetry (closes perf: watch-set cache hit/miss telemetry for validating savings in the field #123)
• perf(daemon): FBUILD_WATCH_SET_CACHE_SECS env override #126 perf(daemon): FBUILD_WATCH_SET_CACHE_SECS env override (closes perf: expose FBUILD_WATCH_SET_CACHE_SECS env override for the watch-set cache window #122)
• perf(build): add fast-path fingerprint check to AVR orchestrator #128 perf(build): add fast-path fingerprint check to AVR orchestrator
• f8533d3 perf(build): extend watch-set fingerprint fast-path to AVR orchestrator

What this PR contains

Pure version bump across the four lock/manifest files:

• Cargo.toml workspace version 2.1.19 → 2.1.20
• Cargo.lock — all 9 workspace crates bumped via cargo update --workspace
• pyproject.toml — 2.1.19 → 2.1.20
• uv.lock — fbuild package bumped via uv lock

Post-merge

Run uv run ci/publish.py (zero-arg release pipeline) to trigger the GitHub Actions build and upload wheels to PyPI. Downstream consumers (FastLED) will then bump their fbuild>=2.1.19 pin to >=2.1.20.

🤖 Generated with Claude Code

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📥 Commits

Reviewing files that changed from the base of the PR and between f8533d3 and 55bb513.

⛔ Files ignored due to path filters (2)

• Cargo.lock is excluded by !**/*.lock
• uv.lock is excluded by !**/*.lock

📒 Files selected for processing (2)

• Cargo.toml
• pyproject.toml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch bump-to-2.1.20

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