ci(release): replace auto-release with conventional commit-based workflow

[llbbl]

Summary

• Replaced auto-release.yml with a unified workflow: conventional commit analysis → version bump → multi-platform binary builds → GitHub Release with git-cliff changelog
• Deleted release.yml (now redundant — build and release are handled inside auto-release.yml)
• Removed manual bump-patch, bump-minor, bump-major, and release-* recipes from justfile; replaced with a single CI-friendly set-version recipe

Changes

CI/CD

• .github/workflows/auto-release.yml: Rewrote from a simple patch-bumping PR-merge hook into a three-job pipeline (version → build → release). The version job parses commit messages since the last tag to determine the correct semver bump, runs lint and tests, commits the updated package.json, and pushes an annotated tag. The build job checks out that tag and compiles binaries for linux-x64, darwin-arm64, darwin-x64, and windows-x64 in parallel. The release job downloads all artifacts, generates a changelog via git-cliff, and publishes a GitHub Release.
• .github/workflows/release.yml: Deleted — fully superseded by the new auto-release.yml.

Refactoring

• justfile: Removed six manual version-bump and release recipes (bump-patch, bump-minor, bump-major, release-patch, release-minor, release-major). Added set-version <version> — a minimal, Linux-compatible recipe that writes the version into package.json without any git side effects, for use by CI.

Test plan

• Merge a fix: commit to main and verify a patch bump is created and a release is published
• Merge a feat: commit to main and verify a minor bump is created
• Verify binaries for all four targets are attached to the release
• Verify the release body contains the git-cliff changelog
• Confirm chore(release): commits do not re-trigger the workflow (skip guard)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.88%. Comparing base (76ce26b) to head (ef018c4).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main       #2   +/-   ##
=======================================
  Coverage   95.88%   95.88%           
=======================================
  Files          13       13           
  Lines         680      680           
=======================================
  Hits          652      652           
  Misses         28       28           

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