ci: add manifest lint check

[ScuttleBot]

The manifest header claims:

A CI lint check verifies that every task_*.md file appears here and every entry here has a corresponding file.

But this wasn't actually wired up. Now it is.

Adds python scripts/lint_manifest.py to the lint workflow, which checks:

• Every manifest entry has a corresponding .md file
• Every task_*.md file is listed in the manifest
• No duplicate entries
• Frontmatter id matches filename

Also adds pyyaml to the lint dependencies.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Solid CI addition — wires up the manifest lint check that was previously only documented but not enforced. Clean and minimal change.

Files Reviewed (1 file)

• .github/workflows/lint.yml

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_{Reviewed by claude-4.6-sonnet-20260217 · 58,311 tokens}