feat(vue): support named slots

[Railly]

Summary

Recreates the Vue named slots implementation from #322 on top of current main, with @wotnak preserved as co-author.

• exposes Vue-native lazy slot functions through defineRegistry
• renders children as the default slot and slots as named slots
• supports raw Vue registries through the same low-level renderer path
• adds catalog-backed slot warnings and Vue schema/prompt support
• updates Vue docs and skill guidance
• adds regression coverage for raw registries, lazy non-consumption, slots.default, undeclared slots, loading warnings, repeat scope, nested conversion, and prompt output

Supersedes #322 after preserving its implementation and authorship.

Verification

• focused Vue renderer/hooks: 36/36
• full test suite: 1,069/1,069
• type-check: 59/59 tasks
• lint: 14/14 tasks
• force-red: removing named-slot delivery fails five focused tests
• Solution Gate: Amend and recreate with credit
• Review Gate: pass on a34d63b

Co-authored implementation credit: @wotnak

[vercel]

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