test: intentionally broken boombox submission [NAT-133]

[tallnato]

Summary

• Adds a test boombox entry (content/_boombox/test-broken-boombox/) with 4 intentional validation errors
• Missing audio field in frontmatter
• Wrong file extension (.aac instead of .mp3/.wav/.flac)
• Missing description field in frontmatter
• Invalid tag not in content/tags.yaml

Expected CI Behavior

Both validate-pr.yml and validate-boombox.yml should fail with these errors:

boombox/test-broken-boombox.md: missing required field "description"
boombox/test-broken-boombox.md: unknown tag "definitely-not-a-real-tag"
boombox/test-broken-boombox/broken-track.aac: invalid file type ".aac" (allowed: .mp3, .wav, .flac)
boombox/test-broken-boombox.md: missing required field "audio"

Test plan

• Local validation confirms all 4 errors detected
• CI Validate PR workflow fails
• CI Validate Boombox Content workflow fails
• Results documented in PR comments

🤖 Generated with Claude Code

[tallnato]

CI Results (Expected Failures)

Both validation workflows failed as expected:

Check	Status
Validate PR	Failed
Validate Boombox Content	Failed
Semantic PR	Passed
Label	Passed
Single Component Check	Passed

Validation errors detected:

1. boombox/test-broken-boombox.md: missing required field "description"
2. boombox/test-broken-boombox.md: unknown tag "definitely-not-a-real-tag"
3. boombox/test-broken-boombox/broken-track.aac: invalid file type ".aac" (allowed: .mp3, .wav, .flac)
4. boombox/test-broken-boombox.md: missing required field "audio"

Conclusion: Validation pipeline correctly catches all 4 intentional errors.

[tallnato]

Review: Looks Good ✓

Intentional test PR — all 4 validation errors are present and CI correctly rejects the submission.

Checklist:

• ✅ Missing audio field in frontmatter
• ✅ Wrong file extension (.aac instead of .mp3/.wav/.flac)
• ✅ Missing description field in frontmatter
• ✅ Invalid tag (definitely-not-a-real-tag)
• ✅ Validate PR workflow failed as expected
• ✅ Validate Boombox Content workflow failed as expected
• ✅ Changes scoped to content/_boombox/ only — no unrelated files

No security, correctness, or scoping issues. LGTM for the stated test purpose.

Note: This PR should NOT be merged to main since it contains intentionally invalid content. Close it once test results are documented, or keep it open as a reference.