ci: scope Homeboy PR checks to changed files

[chubes4]

Summary

• set lint-changed-only: true in Homeboy action workflow
• set test-scope: changed for pull request runs
• keep command set as lint,test,audit while reducing unrelated baseline failures from untouched code

Why

Current PR CI is red due to broad baseline lint/static/audit drift unrelated to PR diffs. This change makes PR checks actionable by focusing on changed files/tests.

Expected impact

• improved signal-to-noise for PR review
• fewer false-negative red builds on unrelated legacy debt
• faster triage while we continue paying down global lint/phpstan/audit backlog

Related

• feat: add workspace global read AI tools #620
• feat: add generic workspace git abilities and CLI #621
• feat: add scoped workspace fetch and publish handlers #622
• Add CI failure digest comment with top failed tests and audit findings homeboy-action#19
• Expose structured test failure summary output for CI consumers homeboy#457

[github-actions]

Homeboy Results — data-machine

✅ lint (changed files only)

• PHPStan: PHPSTAN SUMMARY: 133 errors at level 5

❌ test

• BUILD FAILED: PHPUnit tests

❌ audit (changed files only)

Audit summary

• Drift increased: no
• Outliers in current run: 76

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Homeboy Action v1 — homeboy 0.56.0