feat: support release stream baselines

[jasonsaayman]

Summary

• Add optional release-stream input and config validation
• Select npm baselines from configured major release stream while preserving latest behavior by default
• Update report/comment metadata, docs, tests, and dist bundle

Tests

• pnpm run lint
• pnpm run typecheck
• pnpm test
• pnpm run build

---

Summary by cubic

Adds optional release-stream input to select baselines from a specific major stream (e.g., 1.x) instead of npm latest. Reports, PR comments, and outputs now reflect the chosen stream; default behavior is unchanged.

• New Features

  • Add release-stream (major number). Primary baseline is newest stable in that stream; history stays within the stream. Default still uses npm latest.
  • Reports/comments/docs: JSON adds releaseStream; PR comment baseline and history labels identify the stream; action outputs/README say “selected primary release.” Errors/logs now say “primary release.”
  • Implementation: strict config validation for a non‑negative integer stream; npm resolver filters by major and fails when no matches; action wiring updated; tests added; rebuilt dist; .gitattributes marks generated and archived files; version bumped to 0.1.1.

• Migration

  • No changes needed. To use a stream, set release-stream: '1' (compares against 1.x).

^{Written for commit b9469f4. Summary will update on new commits. Review in cubic}

[github-actions]

Bundle Size Report

Compared current build against latest npm release 7.0.0 for is-number.

File	Baseline gzip	Current gzip	Difference	Status
index.js	267 B	43 B	-224 B (-83.90%)	🟢
Total	267 B	43 B	-224 B (-83.90%)	🟢

Historical comparison: latest + 10 previous npm releases

Release	Baseline gzip	Current gzip	Difference	Status
7.0.0 latest	267 B	43 B	-224 B (-83.90%)	🟢
6.0.0	381 B	43 B	-338 B (-88.71%)	🟢
5.0.0	368 B	43 B	-325 B (-88.32%)	🟢
4.0.0	336 B	43 B	-293 B (-87.20%)	🟢
3.0.0	287 B	43 B	-244 B (-85.02%)	🟢
2.1.0	279 B	43 B	-236 B (-84.59%)	🟢
2.0.2	279 B	43 B	-236 B (-84.59%)	🟢
2.0.1	270 B	43 B	-227 B (-84.07%)	🟢
2.0.0	228 B	43 B	-185 B (-81.14%)	🟢
1.1.2	233 B	43 B	-190 B (-81.55%)	🟢
1.1.1	233 B	43 B	-190 B (-81.55%)	🟢

[cubic-dev-ai]

2 issues found across 21 files

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[cubic-dev-ai]

1 issue found across 10 files (changes from recent commits).

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