docs(claude): fix multi-agent methodology reference to ClickHouse
docs(migration): document expected CLI test failures in v4.0.0
docs(readme): remove second cli.py reference from project structure
docs(readme): remove cli.py from project structure diagrams
docs(claude): update version to 4.0.0 and database info
docs(readme): update CLI removal notice to past tense
fix(version)!: update __version__ to 4.0.0 for release consistency
docs(v4.0.0)!: comprehensive ClickHouse documentation and migration guide
chore(deps): remove QuestDB dependencies for v4.0.0
feat(clickhouse)!: remove QuestDB implementation for v4.0.0
feat(clickhouse)!: implement ClickHouse as primary database (ADR-0005)
docs(validation): complete Agent 3 validation with Bug #5 discovery
fix(query): resolve detect_gaps() QuestDB SQL incompatibility (Bug #5)
fix(questdb)!: resolve all critical bugs from e2e validation (4 bugs + dedup)
fix(questdb)!: critical bugs found in e2e validation - RELEASE BLOCKED
