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Responds to the 2026-07-01 adversarial review's load-bearing finding: advisory-only puts the brain round-trip in the barge-in trigger path, contradicting wedge #1 (README:98-100, ARCHITECTURE.md:79-81). Spec changes: - §1.1: LocalVadReflex<P> added to scope as primary trigger - §1.2: local VAD tuning framework deferred (the VAD itself in scope) - §3.4: new — LocalVadReflex design (RMS, debounce, observe-then-delegate) - §5.1: data flow shows local VAD as primary (≤80ms, zero brain round-trip); brain advisory as secondary (confirms ~300ms later) - §6.1: 'Why advisory-only' → 'Why both, local VAD primary' (revised rationale) - §7: done-criteria 5-12 (added LocalVadReflex unit tests + two e2e paths) Plan changes: - Task 2b: new — LocalVadReflex<P> + 6 unit tests - Task 5: spawn_tap_engine signature revised (takes advisory_tx parameter; media thread owns the channel; two senders via tokio mpsc Sender Clone) - Task 6: Connected spawn site wires LocalVadReflex<Reflex<TapAudioPipe>> - Task 9: two e2e cases — PRIMARY (kill WITHOUT brain, wedge #1 proof) + SECONDARY (advisory backstop) - Self-review: wedge-#1 audit line added — Task 9 step 1 is the proof DCO signoff added per AGENTS.md (commit -s). Signed-off-by: opencode controller <controller@local>