chore(tasks): mark p9-fb-07 completed

PR #66 머지 (eac08ed). 머지 후 spec status 갱신.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tasks/p9/p9-fb-07-md-title-fallback.md

@@ -3,7 +3,7 @@ phase: P9
 component: kebab-parse-md + kebab-normalize
 task_id: p9-fb-07
 title: "Markdown title fallback chain (frontmatter → H1 → H2 → first paragraph → filename)"
-status: in_progress
+status: completed
 depends_on: []
 unblocks: []
 contract_source: ../../docs/superpowers/specs/2026-04-27-kebab-final-form-design.md