- Created Zod schemas for TaskState, AgentState, and OrchestratorEvent
- Added ValkeyValidationError class for detailed error context
- Validate task and agent state data after JSON.parse
- Validate events in subscribeToEvents handler
- Corrupted/tampered data now rejected with clear errors including:
- Key name for context
- Data snippet (truncated to 100 chars)
- Underlying Zod validation error
- Prevents silent propagation of invalid data (SEC-ORCH-6)
- Added 20 new tests for validation scenarios
Refs #337
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>