ci: lint PR titles against Conventional Commits

[daniel3303]

Summary

• Adds a workflow using amannn/action-semantic-pull-request@v5 to validate every PR title against the Conventional Commits spec.
• The repo already follows the convention (e.g. fix(json-query): ..., test(integration): ..., ci: ...) — this just enforces it for external contributors via a required check.
• Uses default config (built-in list of accepted types). No additional secrets needed; the workflow has read-only pull-requests permission.

Code changes

• .github/workflows/lint-pr-title.yml — new workflow firing on opened, edited, synchronize PR events.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.56%. Comparing base (205e71c) to head (6e4499a).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #68   +/-   ##
=======================================
  Coverage   99.56%   99.56%           
=======================================
  Files          25       25           
  Lines        1157     1157           
  Branches      128      128           
=======================================
  Hits         1152     1152           
  Misses          1        1           
  Partials        4        4           

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