fix(eq): resolve base-speaker preset live instead of pinning a stale copy

_onDispositivoCambiado() bootstrapped a device-level preset entry for
every never-seen device id, including the built-in speaker. That
persistent level-3 entry masked later global-preset edits (level 3
beats level 4 on every resolution), so disconnecting a BT device or
cold-starting without one could leave the EQ stuck on an outdated
copy instead of the current global preset.

The base speaker is now excluded from the first-seen bootstrap:
disconnect and cold start always resolve through the live hierarchy.
BT/wired/USB devices keep their bootstrap behavior unchanged.

openspec/changes/archive/2026-07-10-eq-device-disconnect-revert/state.yaml

@@ -0,0 +1,17 @@
+schema: sdd-change-state
+change: eq-device-disconnect-revert
+status: archived
+archived_date: 2026-07-10
+verification_verdict: PASS WITH WARNINGS
+critical_issues: 0
+warning_issues: 1
+suggestion_issues: 3
+tasks_complete: 15
+tasks_total: 16
+notes: |
+  Change archived successfully. Spec delta merged into main spec.
+  Task 5.1 (manual on-device sanity check) remains PENDING as non-blocking human gate.
+  Pre-existing cambiarPresetPrincipal() hierarchy-bypass carried forward as tracked tech debt.
+  Verification WARNING (spec-text/implementation drift on Requirement 2) already resolved:
+  on-disk spec file at openspec/changes/eq-device-disconnect-revert/specs/multi-device-eq/spec.md
+  was edited post-verify to match safer implementation (no entry ever created for builtin_speaker).