docs(plan): add M3 session similarity implementation plan
Eight-task TDD-shaped plan covering pure Similarity + ContextualMatchScore functions, Score extension with ContextWeight=2.0, two new sqlc queries (ListActiveContextualLikesForUser, GetCurrentSessionVectorForUser), LoadCandidates signature change to accept currentVector, radio handler wiring, end-to-end contextual ranking test, and final verification. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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