docs: Update documentation for search pipeline and Phase A spec
- README.md: Add hybrid search and robot mode to feature list. Update quick start to use new noun-first CLI syntax (lore issues, lore mrs, lore search). Add embedding configuration section. Update command examples throughout. - AGENTS.md: Update robot mode examples to new CLI syntax. Add search, sync, stats, and generate-docs commands to the robot mode reference. Update flag conventions (-n for limit, -s for state, -J for JSON). - docs/prd/checkpoint-3.md: Major expansion with gated milestone structure (Gate A: lexical, Gate B: hybrid, Gate C: sync). Add prerequisite rename note, code sample conventions, chunking strategy details, and sqlite-vec rowid encoding scheme. Clarify that Gate A requires only SQLite + FTS5 with no sqlite-vec dependency. - docs/phase-a-spec.md: New detailed specification for Gate A (lexical search MVP) covering document schema, FTS5 configuration, dirty queue mechanics, CLI interface, and acceptance criteria. - docs/api-efficiency-findings.md: Analysis of GitLab API pagination behavior and efficiency observations from production sync runs. Documents the missing x-next-page header issue and heuristic fix. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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