v5.0.0

Added — Multi-Tool AI Framework

• Canonical Rule Engine (src/core/rule-engine.ts): Rules live in .rulebook/rules/ with YAML frontmatter and are projected to 6 AI tool formats simultaneously (Claude Code, Cursor, Gemini, Copilot, Windsurf, Continue.dev). One source, multiple projections.
• 9 Canonical Rule Templates in templates/rules/: no-shortcuts, git-safety, sequential-editing, research-first, task-decomposition, incremental-tests, no-deferred, follow-task-sequence, session-workflow
• Adaptive Agent Framework (src/core/agent-template-engine.ts): Agent templates per project type with graceful degradation — full agents for Claude Code, contextual .mdc rules for Cursor, inline sections for Gemini/Codex
• 15 Agent Templates across 5 project types: generic (5), game-engine (4), compiler (3), web-app (5), mobile (2)
• Project Complexity Detection (src/core/complexity-detector.ts): Auto-assess LOC, languages, and structure to calibrate rule generation (small/medium/large/complex tiers)
• 7 Tier 1 Prohibitions in TIER1_PROHIBITIONS.md: no shortcuts, git safety, no delete, research-first, sequential editing, no deferred, follow task sequence
• Token Optimization in TOKEN_OPTIMIZATION.md: Model tier assignment (core/standard/research) with per-tier output verbosity rules
• Session Management MCP Tools: rulebook_session_start (load PLANS.md + memories), rulebook_session_end (save summary), rulebook_rules_list, rulebook_blockers
• Task Blocker Chain: blocks/blockedBy/cascadeImpact in task metadata, rulebook task blockers CLI command, rulebook_blockers MCP tool
• Config Schema Extensions: agentFramework and referenceSource sections in RulebookConfig
• New CLI Commands: rulebook assess, rulebook rules list|add|project, rulebook task blockers, rulebook task blocked-by <id>
• --tools flag on rulebook init and rulebook update for explicit tool targeting
• Calibrated Init: rulebook init now auto-assesses complexity, installs appropriate rules, and projects to detected tools
• 58 New Tests across 4 test files: rule-engine (22), agent-template-engine (15), complexity-detector (13), task-blockers (5), session-management (3)

Changed — Performance

• BREAKING: Replaced sql.js (WASM) with better-sqlite3 (native): Eliminates db.export() copies (100-500MB per save), WAL journal for zero-copy writes, <5ms init vs ~300ms WASM JIT, O(1) size check via statSync. Existing .db files are compatible (standard SQLite3 format).
• Replaced fs.watch with chokidar for background indexer: OS-level ignore patterns (no more node_modules event flood), cross-platform reliability, write stabilization
• HNSW search optimized: Replaced array.sort() with MinHeap/MaxHeap priority queues (~100x fewer comparisons per query)
• Fixed HNSW orphan leak: Code node vectors now properly removed from HNSW index on file delete
• Cached getDbSizeBytes(): No longer allocates full DB copy just to get size
• Moved checkAndEvict() out of saveMemory() hot path — runs every 50 saves
• Fixed BM25 query safety: Proper FTS5 special character escaping
• Clamped exportMemories limit from 100,000 to 1,000
• Removed duplicate SIGINT/SIGTERM listeners in Ralph MCP tool
• Updated GIT_WORKFLOW.md with explicit allow-list/forbidden-list table