feat(pipeline): G3 Full Decision Memory — compliance lifecycle event stream

New table: decision_events (assessment→decision→fix→verification→failure cycle)
New API:
  POST /v1/decision-events (record lifecycle event)
  GET /v1/decision-events (list with filters)
  GET /v1/decision-events/timeline/{control_id} (full chronological timeline)
  GET /v1/decision-events/stats (failure rate, cycle times)

Each event captures input_state, output_state, actor, evidence.
454 tests pass, 0 regressions.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

control-pipeline/migrations/008_decision_events.sql

@@ -0,0 +1,37 @@
+-- Migration 008: Decision Events / Full Decision Memory (G3)
+-- Schema: compliance
+-- Run: ssh macmini "docker exec -i bp-core-postgres psql -U breakpilot -d breakpilot_db" < control-pipeline/migrations/008_decision_events.sql
+
+SET search_path TO compliance, public;
+
+CREATE TABLE IF NOT EXISTS decision_events (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    decision_trace_id UUID REFERENCES decision_traces(id) ON DELETE SET NULL,
+    control_uuid UUID NOT NULL,
+    tenant_id UUID,
+
+    -- Event type
+    event_type VARCHAR(30) NOT NULL
+        CHECK (event_type IN (
+            'assessment', 'decision', 'fix_planned', 'fix_started',
+            'fix_completed', 'verification', 'failure', 'exception', 'escalation'
+        )),
+
+    -- State before/after
+    input_state JSONB DEFAULT '{}',
+    output_state JSONB DEFAULT '{}',
+
+    -- Details
+    summary TEXT,
+    actor VARCHAR(200),
+    evidence_ids JSONB DEFAULT '[]',
+    metadata JSONB DEFAULT '{}',
+
+    created_at TIMESTAMPTZ DEFAULT NOW()
+);
+
+CREATE INDEX IF NOT EXISTS idx_de_control ON decision_events(control_uuid);
+CREATE INDEX IF NOT EXISTS idx_de_trace ON decision_events(decision_trace_id);
+CREATE INDEX IF NOT EXISTS idx_de_tenant ON decision_events(tenant_id);
+CREATE INDEX IF NOT EXISTS idx_de_type ON decision_events(event_type);
+CREATE INDEX IF NOT EXISTS idx_de_created ON decision_events(created_at);