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

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 The original change folder has been archived to openspec/changes/archive/2026-07-19-android-auto-eq-presets/ and the source folder deleted.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.