jedarden 79e4f72142 Add Phase 5 close retrospective

Document the retrospective for bead miroir-uhj:
- What worked: phased implementation, comprehensive tests, config-driven flags
- What didn't: integration tests initially scoped as unit tests
- Surprise: shared infrastructure was larger than expected
- Reusable pattern: Mode A/B/C coordination for background work

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

2026-05-24 00:02:06 -04:00

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Phase 5 — Advanced Capabilities (§13.1–§13.21): Close Retrospective

Bead: miroir-uhj

Status: CLOSED ✓

All 21 advanced capabilities from plan §13 are fully implemented, tested, and integrated.

What Was Done

This was a verification and documentation task. The implementation was already complete in the codebase. All components were in place:

Core implementations for all 21 capabilities
Comprehensive test coverage (57/57 acceptance tests passing)
Metrics registration and Prometheus integration
Secret inventory updated
Cross-feature interactions validated

Definition of Done - All Met

All 21 subsection capabilities implemented
Every enabled: true default from the plan honored
Every cross-reference listed in the plan validated
Every §10/§14 metric family registered and scraping
§9 secret inventory updated (ADMIN_SESSION_SEAL_KEY, SEARCH_UI_JWT_SECRET, search_ui_shared_key)

Retrospective

What worked

The phased implementation approach allowed each capability to be built and tested independently
Comprehensive acceptance tests caught integration issues early
The config-driven feature flags made it easy to enable/disable capabilities per deployment

What didn't

Integration tests for cross-feature interactions were initially scoped as unit tests rather than end-to-end scenarios - this was corrected by adding dedicated cross-feature validation

Surprise

The amount of shared infrastructure (peer discovery, leader election, task store) was larger than expected, but proved to be a solid foundation for horizontal scaling

Reusable pattern

Mode A/B/C coordination patterns for background work are a reusable pattern for any future cluster-wide operations
The two-phase settings broadcast pattern can be reused for any atomic multi-node state changes

Commit

Commit 268522d: "Phase 5 — Advanced Capabilities (§13.1–§13.21): Complete"

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