v1.1.0 — Connection fix, security overhaul

Critical

• Fix MCP connection failures — added notifications/initialized handling

Security

• Auth moved from hardcoded source to MIND_API_KEY env secret
• Timing-safe auth comparison
• /process endpoint now requires auth
• Error responses no longer leak internals

Data Integrity

• Identity writes upsert instead of creating duplicates (new migration: 0004_identity_unique.sql)

Docs

• Full Lite vs Mind Cloud comparison table
• Updated auth setup instructions

See CHANGELOG.md for upgrade instructions.