Add comprehensive research context tracking to jobs:
- Narrative fields: hypothesis, context, intent, expected_outcome
- Experiment groups and tags for organization
- Run comparison (compare command) for diff analysis
- Run search (find command) with criteria filtering
- Run export (export command) for data portability
- Outcome setting (outcome command) for experiment validation
Update queue and requeue commands to support narrative fields.
Add narrative validation to manifest validator.
Add WebSocket handlers for compare, find, export, and outcome operations.
Includes E2E tests for phase 2 features.
