Fixes issue #3440: agents session show JSON output uses wrong field names and wrong data types.
- Add LinkedPlan value object with plan_id, phase, state fields
- Add automation field to Session domain model
- Rewrite as_cli_dict() with spec-compliant field names in session_summary wrapper
- Use 'text' key in recent_messages items
- Replace linked_plan_ids with linked_plans objects
- Format estimated_cost as string (e.g. '$0.0184')
- Update session show rich output with spec-compliant labels
- Update tests to assert new field names
ISSUES CLOSED: #3440
Co-authored-by: Jeffrey Phillips Freeman <the@jeffreyfreeman.me>
Co-committed-by: Jeffrey Phillips Freeman <the@jeffreyfreeman.me>
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Jeff