docs(notion): add Phase 3b-i implementation plan
Eight bite-sized TDD tasks covering: LLM client abstraction, cache
layer, query expansion, search execution, candidate enrichment,
rerank, CLI assembly, and slash command + docs. Each task ends with
a working commit; total 29 passing tests at completion.
Plan: docs/superpowers/plans/2026-04-28-notion-semantic-search.md
Spec: docs/superpowers/specs/2026-04-28-notion-semantic-search-design.md
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Andrew Yim
56f33eca3f