ci: add per-package bundle size tracking to PRs

[ScriptedAlchemy]

Summary

• Add bundle size CI that measures each package's dist/ output, compares PR vs base branch, and posts a markdown comparison table as a PR comment
• Uses a two-workflow pattern (pull_request → workflow_run) for fork security
• Zero new dependencies — script uses only Node.js built-ins

Files added

• scripts/bundle-size-report.mjs — measurement & comparison script (discovers type:pkg packages, measures total dist + ESM gzip)
• .github/workflows/bundle-size.yml — build & measure workflow
• .github/workflows/bundle-size-comment.yml — PR comment workflow

Test plan

• Script syntax validated (node --check)
• Measure mode tested locally — discovers 36 packages, outputs JSON with sizes
• Compare mode tested with identical data — outputs "No bundle size changes detected"
• Compare mode tested with simulated deltas — renders markdown table with correct formatting, bolds >5% changes

🤖 Generated with Claude Code

[changeset-bot]

⚠️ No Changeset found

Latest commit: e212e1d

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Count dist/src outputs in total dist size

The size calculation skips any directory named src, which means packages that emit their build output to dist/src (e.g., several packages’ main/exports entries point at dist/src/index.js) will report a totalDist of 0 or severely undercounted. In those cases the “Total dist” column and deltas become meaningless even when the compiled output changes, so bundle size regressions in those packages will be hidden.

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