docs(openspec): archive android-auto-eq-presets

Merges its delta requirements into the android-auto-media base spec.

openspec/changes/archive/2026-07-19-android-auto-eq-presets/archive-report.md

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+# Archive Report: android-auto-eq-presets
+
+**Date**: 2026-07-19  
+**Change**: android-auto-eq-presets  
+**Status**: ARCHIVED - VERIFIED PASS  
+**Commit**: 90cd232 on main  
+
+## Summary
+
+The android-auto-eq-presets change has completed all phases (proposal → spec → design → tasks → apply → verify) with a PASS verdict (0 CRITICAL, 0 WARNING, 0 SUGGESTION). The change adds a browsable `Ecualizador` folder to the Android Auto media tree, exposing the 6 fixed EQ presets as selectable items without interrupting playback. Implementation spans 3 files with 346 changed lines (339 insertions + 7 deletions), all covered by strict TDD (46/46 tests passing). Delta spec requirements have been merged into the base `openspec/specs/android-auto-media/spec.md`. The original change folder has been archived to `openspec/changes/archive/2026-07-19-android-auto-eq-presets/` and the source folder deleted.
+
+## Artifacts Preserved
+
+| Artifact | Location | Type |
+|----------|----------|------|
+| Proposal | `archive/2026-07-19-android-auto-eq-presets/proposal.md` | Requirements intent and scope |
+| Design | `archive/2026-07-19-android-auto-eq-presets/design.md` | Architecture, 6 ADRs, integration points |
+| Tasks | `archive/2026-07-19-android-auto-eq-presets/tasks.md` | 5 phases, 21 tasks (all complete) |
+| Apply Progress | `archive/2026-07-19-android-auto-eq-presets/apply-progress.md` | TDD cycle evidence, 3 files modified |
+| Verify Report | `archive/2026-07-19-android-auto-eq-presets/verify-report.md` | Test execution, spec compliance, 0 issues |
+| Delta Spec | `archive/2026-07-19-android-auto-eq-presets/specs/android-auto-media/spec.md` | Original change-scoped spec delta |
+
+## Base Spec Merge
+
+**File**: `openspec/specs/android-auto-media/spec.md`
+
+**Changes**:
+1. **Modified "Browsable Media Tree" requirement** (line 63):
+   - Root folder count updated from 3 to 4 (added `Ecualizador`)
+   - Updated scenario "Car requests the root" to return 4 folders instead of 3
+   - Updated requirement description to reference EQ folder and preset behavior
+
+2. **Added "EQ Preset Browsable Folder" requirement** (new):
+   - 6 fixed presets exposed as playable items in `Ecualizador` folder
+   - Distinct `eq_preset:<nombre>` media-id scheme
+
+3. **Added "EQ Preset Selection Applies Without Disturbing Playback" requirement** (new):
+   - Branch in `playFromMediaId` intercepted BEFORE `emisora:`/`grupo:` routing
+   - No `playMediaItem` call, no `mediaItem` mutation
+   - Three scenarios: preset while playing, preset while stopped, unknown/stale id
+
+4. **Added "EQ Preset Persistence and Phone/Car Parity" requirement** (new):
+   - Preset applied from car persists as principal preset
+   - Eventual phone/car parity via SharedPreferences
+   - Two scenarios: car-to-phone, phone-to-car parity
+
+5. **Added "Active Preset Indication (Optional)" requirement** (new):
+   - Optional visual marker via title-text convention
+   - Explicitly allows out-of-scope scoping (ADR-6)
+   - Two scenarios: with marker, without marker
+
+## Implementation Evidence
+
+**Files Modified**:
+- `lib/servicios/navegacion_auto.dart` — 94 insertions (const, functions, tree builder)
+- `lib/servicios/servicio_audio.dart` — 26 insertions (handler wiring)
+- `test/servicios/navegacion_auto_test.dart` — 226 insertions (15 new test cases, 46/46 passing)
+
+**Test Results**:
+- `navegacion_auto_test.dart`: 46/46 passing (34 pre-existing + 12 new test blocks)
+- Regression check: `estado_radio_test.dart` (favorite-groups shared surface): 22/22 passing
+- Load-bearing invariant verified: preset tap structurally cannot reach `playMediaItem`
+
+**Design Adherence**:
+- All 6 ADRs (ADR-1 through ADR-6) verified in live code
+- Headless-safe persistence via `ServicioEcualizador.guardarPrincipal` (SharedPreferences)
+- Per-station preset override gate mirrored from `cambiarPresetPrincipal`
+- Active-preset marker scoped out per ADR-6 (no partial/stale implementation)
+
+## Verification
+
+**Verdict**: PASS (0 CRITICAL, 0 WARNING, 0 SUGGESTION)
+
+**Coverage**:
+- Completeness: All 21 tasks verified complete
+- Test execution: Independently re-run (46/46 navegacion_auto, 22/22 regression)
+- Structural invariants: Signature-enforced non-playback guarantee
+- Spec compliance: All 5 spec requirements mapped to code
+- Design coherence: All ADRs traced against implementation
+
+**Deviations identified and verified harmless**:
+1. `servicio_ecualizador.dart` import added (required for instantiation, task-description omission only)
+2. `playFromMediaId` restructured to single outer try/catch (functionally inert for pre-existing paths, required for spec exception safety)
+
+## Archive Integrity
+
+**Source deletion**: Original `openspec/changes/android-auto-eq-presets/` directory has been deleted. No files remain in the change folder; all artifacts are archived in `openspec/changes/archive/2026-07-19-android-auto-eq-presets/`.
+
+**Engram memory**: Archive report saved to engram topic `sdd/android-auto-eq-presets/archive-report` with full observation ID for traceability.
+
+## Next Steps
+
+- Change is complete and closed.
+- No follow-up work required (ADR-6 scoping decision on active-preset marker is intentional; revisit only if reliable tree-refresh trigger is added).
+- Merged base spec is ready for team use and future changes.