Prepare release v0.22.1

[Copilot]

Patch release to ship the release pipeline fix from #1289 (pnpm lockfile migration) that was merged after v0.22.0.

Changes

• Cargo.toml — bump workspace version 0.22.0 → 0.22.1
• Cargo.lock — regenerated via cargo check
• CHANGELOG.md — promote Unreleased → [0.22.1] - 2026-03-13, document the pipeline fix, add fresh Unreleased section

Post-merge

Maintainer must create and push a signed tag to trigger the (now-fixed) release pipeline:

git tag -s v0.22.1 -m "Release v0.22.1"
git push upstream v0.22.1

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.3%. Comparing base (36a07f8) to head (f767b03).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #1290   +/-   ##
=====================================
  Coverage   81.2%   81.3%           
=====================================
  Files        111     111           
  Lines       9377    9377           
=====================================
+ Hits        7623    7625    +2     
+ Misses      1754    1752    -2     

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