- Add ## Contents and ## Decision Tree to all 10 existing pattern files - Fix embed_as/1 semantics inversion in types.md (:self → :dump) - Fix fabricated __meta__.changes reference in changesets.md - Fix default primary key type (:integer → :id) in schemas.md - Combine @impl subsections into single "Minimal Callback Annotation"
Adds 5 new pattern files covering the core Ecto APIs, each with real source citations at commit fd2ec52b, before/after examples, anti-patterns, and decision trees. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>