fix: dedupe generated agent rule artifacts

[markcallen]

Summary

• skip common agents when emitting language-specific rule subdirectories, and skip language agents when emitting the common rule subdirectory
• remove stale generated common-vs-TypeScript duplicate rule artifacts and an unselected generated Claude skill
• add a generated artifact inventory GitHub Action and reference it from the issue priority plan

Validation

• Tests or checks run: pnpm --filter @everydaydevopsio/ballast exec jest src/build.test.ts src/install.test.ts src/repo-generated-artifacts.test.ts --runInBand
• Tests or checks run: pnpm --filter @everydaydevopsio/ballast run build
• Tests or checks run: pnpm --filter @everydaydevopsio/ballast run lint
• Tests or checks run: pnpm --filter @everydaydevopsio/ballast run prettier
• Docs updated or not needed: plans/issue-priority-plan.md references the new generated artifact inventory gate
• Generated files updated or not needed: stale generated duplicate artifacts removed from .codex/rules and .claude/rules

Agent Notes

• Related issue/PRD: Add agent validation tests: Dockerfiles + rule validation per AI platform #10
• Risk level: Medium; changes generated artifact inventory and install filtering for rule subdirectories
• Follow-up needed: promote generated artifact gate to strict byte-for-byte drift enforcement after version-stamp drift is cleaned up

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Pull request overview

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Pull request overview

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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