feat(risk): Phase 12 — Risk Intelligence [FASE-12]

- TechniqueRiskProfile model: per-technique risk scoring (0-100)
- 4-factor weighted scoring: detection_gap(35%) + threat_actors(30%) + osint(20%) + test_failures(15%)
- Risk levels: critical(≥75) / high(≥50) / medium(≥25) / low(≥10) / info
- Detailed scoring_breakdown (JSONB) + actionable recommendations per technique
- Router /api/v1/risk: compute-all, compute-one, list, matrix, summary, recommendations, top
- Alembic migration b038risk (raw SQL, idempotent)
- QA script: 60+ tests across all endpoints

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/alembic/versions/b038_risk_intelligence.py

@@ -0,0 +1,62 @@
+"""Phase 12: Risk Intelligence — technique_risk_profiles table
+
+Revision ID: b038risk
+Revises: b037know
+Create Date: 2026-05-20
+
+Uses raw SQL to bypass SQLAlchemy DDL hooks.
+"""
+
+from typing import Union
+from alembic import op
+import sqlalchemy as sa
+
+revision: str = "b038risk"
+down_revision: Union[str, None] = "b037know"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    conn = op.get_bind()
+
+    conn.execute(sa.text("""
+        CREATE TABLE IF NOT EXISTS technique_risk_profiles (
+            id                  UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+            technique_id        UUID NOT NULL REFERENCES techniques(id) ON DELETE CASCADE,
+            risk_score          FLOAT NOT NULL DEFAULT 0.0,
+            likelihood          FLOAT NOT NULL DEFAULT 0.0,
+            impact              FLOAT NOT NULL DEFAULT 0.0,
+            risk_level          VARCHAR(16) NOT NULL DEFAULT 'info',
+            detection_gap       FLOAT NOT NULL DEFAULT 1.0,
+            threat_actor_count  INTEGER NOT NULL DEFAULT 0,
+            osint_signal_count  INTEGER NOT NULL DEFAULT 0,
+            test_fail_count     INTEGER NOT NULL DEFAULT 0,
+            test_total_count    INTEGER NOT NULL DEFAULT 0,
+            test_failure_rate   FLOAT NOT NULL DEFAULT 0.0,
+            confidence_level    FLOAT NOT NULL DEFAULT 0.0,
+            scoring_breakdown   JSONB,
+            recommendations     JSONB,
+            computed_at         TIMESTAMP DEFAULT now(),
+            is_stale            BOOLEAN DEFAULT TRUE,
+            CONSTRAINT uq_risk_profile_technique UNIQUE (technique_id)
+        )
+    """))
+
+    conn.execute(sa.text(
+        "CREATE INDEX IF NOT EXISTS ix_risk_profiles_risk_score "
+        "ON technique_risk_profiles (risk_score)"
+    ))
+    conn.execute(sa.text(
+        "CREATE INDEX IF NOT EXISTS ix_risk_profiles_risk_level "
+        "ON technique_risk_profiles (risk_level)"
+    ))
+    conn.execute(sa.text(
+        "CREATE INDEX IF NOT EXISTS ix_risk_profiles_stale "
+        "ON technique_risk_profiles (is_stale)"
+    ))
+
+
+def downgrade() -> None:
+    conn = op.get_bind()
+    conn.execute(sa.text("DROP TABLE IF EXISTS technique_risk_profiles"))