# Archive Report: android-auto-favorite-groups

**Date**: 2026-07-19
**Status**: PASS WITH WARNINGS → ARCHIVED
**Artifact Store**: hybrid (openspec + engram)

## Change Summary

**Change Name**: android-auto-favorite-groups
**Proposal**: Expose favorite groups (`GrupoFavoritos`) as browsable, non-playable sub-folders in the Android Auto browse tree under the existing `Favoritos` folder, leveraging the existing group data model without introducing new schema or phone-UI changes.

**Verification Verdict**: PASS WITH WARNINGS
- **CRITICAL Issues**: 0
- **WARNING Issues**: 1 (test-count report accuracy in apply-progress.md, corrected to 54/54 before archive)
- **SUGGESTION Issues**: 2 (non-blocking, low-priority)

**Implementation Status**: Complete (git commit f368bcc on main, 291 changed lines across 5 files)

## Artifacts Archived

| Artifact | Location | Status |
|----------|----------|--------|
| proposal.md | openspec/changes/archive/2026-07-19-android-auto-favorite-groups/proposal.md | Archived |
| design.md | openspec/changes/archive/2026-07-19-android-auto-favorite-groups/design.md | Archived |
| tasks.md | openspec/changes/archive/2026-07-19-android-auto-favorite-groups/tasks.md | Archived |
| apply-progress.md | openspec/changes/archive/2026-07-19-android-auto-favorite-groups/apply-progress.md | Archived |
| verify-report.md | openspec/changes/archive/2026-07-19-android-auto-favorite-groups/verify-report.md | Archived |
| delta spec | openspec/changes/archive/2026-07-19-android-auto-favorite-groups/specs/android-auto-media/spec.md | Archived |

## Spec Synchronization

### Main Spec Updated
**File**: openspec/specs/android-auto-media/spec.md

**Changes Applied**:
1. **ADDED**: "Favorite Group Sub-Folders" requirement (3 scenarios)
   - Car requests Favoritos folder and groups exist
   - Car requests a group folder's stations
   - Car requests an unknown or stale group id

2. **ADDED**: "Empty Favorite Group Handling" requirement (2 scenarios)
   - Empty group folder is browsed (if shown)
   - No user-facing dead end

3. **MODIFIED**: "Browsable Media Tree" requirement
   - Updated description to note `Favoritos` MAY contain favorite-group sub-folders
   - Changed precedent note from "Previously: no subtitle requirement..." to "Previously: `Favoritos` was a flat folder of playable station items only, with no sub-folder nesting."
   - Added new scenario: "Ungrouped station appears exactly as before (regression guard)"

**Summary**: 2 new requirements (7 scenarios total), 1 existing requirement enhanced with 1 new scenario, maintaining full backward-compatibility for ungrouped stations.

## Implementation Verification

**Verification Command**:
```
flutter test test/servicios/navegacion_auto_test.dart test/estado/estado_radio_test.dart --concurrency=1 --timeout=60s
```

**Result**: PASS — 54/54 tests
- navegacion_auto_test.dart: 33/33 passed
- estado_radio_test.dart: 21/21 passed

**Files Changed** (5 total, 291 changed lines):
1. `lib/servicios/navegacion_auto.dart` — Added `grupos()` source, snapshot field, `esCarpetaGrupo`, `itemGrupo`, `carpetasFavoritos`, `hijosGrupo` methods
2. `lib/servicios/servicio_audio.dart` — Added two new branches in `getChildren` dispatch
3. `lib/estado/estado_radio.dart` — Push `gruposFavoritos` into Auto snapshot
4. `test/servicios/navegacion_auto_test.dart` — Added 8 new test groups covering pure builders
5. `test/estado/estado_radio_test.dart` — Updated fake, added snapshot-push assertion

**Regression Guard**: Regression parity test confirms byte-identical output for `Favoritos` folder when no custom groups exist — the no-custom-groups case reuses the existing `hijos()` path, not a parallel reimplementation.

## Issues Summary

### WARNING (1)
1. **Test-count report accuracy** (apply-progress.md)
   - apply-progress.md originally claimed 55/55 tests (34/34 + 21/21)
   - Actual: 54/54 tests (33/33 + 21/21)
   - Status: Corrected before archive
   - Impact: Cosmetic documentation defect only; no missing coverage

### SUGGESTIONS (2)
1. **50-group cap boundary test** — uses bulk-of-60 style, not exact 50-vs-51 boundary; consistent with pre-existing precedent
2. **Mixed browsable+playable children car-UI rendering** — flagged as open question, requires DHU/hardware testing; carry forward as known residual risk

## Rollback Information

**Rollback is straightforward**:
- Revert the `grupos()` method and snapshot field from `FuenteEmisorasAuto`
- Revert the two new branches in `servicio_audio.dart` `getChildren`
- Revert the `_fuenteAuto?.actualizarSnapshot(grupos: ...)` push in `estado_radio.dart`
- All changes are additive; pre-existing 3-folder tree, group CRUD, phone UI, and SQLite schema remain untouched

## Verification Compliance

| Requirement | Status | Evidence |
|-------------|--------|----------|
| Favorite Group Sub-Folders spec compliance | PASS | carpetasFavoritos test cases (459-524), esCarpetaGrupo prefix checks |
| grupo:<id> collision-free vs emisora:<uuid> | PASS | resolver collision test (557-565) confirms no-op for grupo: prefix |
| Empty group handling | PASS | empty-group fixture test (484-505) confirms omission from tree |
| Regression guard (ungrouped stations) | PASS | byte-identical output via direct hijos() reuse (navegacion_auto.dart:234, test 429-457) |
| Design coherence | PASS | All 7 design decisions verified against implementation |
| Task completion | PASS | All 22 tasks marked complete, confirmed by code inspection |
| TDD cycle compliance | PASS | 54/54 tests passing, pure functions fully unit-tested |

## SDD Cycle Closure

This change completes the full SDD cycle for android-auto-favorite-groups:

1. ✅ **Exploration**: Investigation 1 (Approach 1 — data-model reuse)
2. ✅ **Proposal**: Defined scope, capabilities, risks, rollback
3. ✅ **Spec**: Delta spec with 2 new + 1 modified requirements
4. ✅ **Design**: 4 architecture decisions, pure-function seam strategy
5. ✅ **Tasks**: 5 phases, 22 tasks (foundation → core → wiring → testing → cleanup)
6. ✅ **Apply**: Strict TDD, single PR, 291 changed lines, 54/54 tests green
7. ✅ **Verify**: Fresh adversarial pass, PASS WITH WARNINGS (1 cosmetic, 2 suggestions)
8. ✅ **Archive**: Specs merged, change folder moved, audit trail created

## Next Steps

- **No follow-up required** — change is complete and ready for release
- **Known residual risk**: Mixed browsable+playable children rendering on real car UI — schedule DHU/hardware verification before launch if not yet done
- **Optional enhancement**: Consider boundary test for 50-vs-51 group cap as a future refinement (non-blocking)

## Persistence

This archive report is persisted to:
1. **Filesystem**: openspec/changes/archive/2026-07-19-android-auto-favorite-groups/archive-report.md (this file)
2. **Engram**: topic_key `sdd/android-auto-favorite-groups/archive-report` (via mem_save, architecture type)

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**Archive Date**: 2026-07-19
**Archived By**: sdd-archive executor
**Status**: COMPLETE