Prefer a markdown skill's heading title over its name slug in the skill menu

[jurgenwerk]

The room skill menu labeled markdown skills with their kebab-case frontmatter slug (source-code-editing) because the display-title fallback chain checked frontmatter.name before the file's indexed title. Reordering the chain shows the H1 the realm already extracts ("Source Code Editing"), with the slug remaining as last resort for heading-less files. Skill cards are unaffected — cardTitle still wins first. The prompt-facing title in prompt assembly deliberately keeps the slug, since skills cross-reference each other by slug in prose.

Before:

After:

[github-actions]

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Host Test Results

    1 files      1 suites   2h 48m 43s ⏱️
3 469 tests 3 454 ✅ 15 💤 0 ❌
3 488 runs  3 473 ✅ 15 💤 0 ❌

Results for commit a7bff58.

Realm Server Test Results

    1 files      1 suites   11m 48s ⏱️
1 814 tests 1 814 ✅ 0 💤 0 ❌
1 893 runs  1 893 ✅ 0 💤 0 ❌

Results for commit a7bff58.