feat: add minimal run engine

docs/schemas/personas/fake-devflow-agent@1.yaml

@@ -0,0 +1,15 @@
+name: fake-devflow-agent
+version: 1
+backend: fake
+capabilities:
+  - spec_write
+  - phase_planning
+  - task_dag_planning
+  - code_edit
+  - test_first_development
+  - command_execute
+  - final_report_compose
+maxRiskLevel: high
+promptConfig:
+  instructionsPrelude: "Use the fake backend fixture protocol."
+modelConfig: {}

docs/schemas/templates/development@1.yaml

@@ -0,0 +1,35 @@
+name: development
+version: 1
+roles:
+  - id: spec_writer
+    requiredCapabilities:
+      - spec_write
+    preferredBackends:
+      - fake
+  - id: phase_planner
+    requiredCapabilities:
+      - phase_planning
+    preferredBackends:
+      - fake
+phases:
+  - key: spec
+    title: Development Specification
+    risk: low
+    roles:
+      - spec_writer
+    expectedArtifact:
+      path: artifacts/spec.json
+      schema: dev/spec@1
+    gates:
+      - spec_approved
+  - key: phase_plan
+    title: Phase Plan
+    risk: low
+    roles:
+      - phase_planner
+    expectedArtifact:
+      path: artifacts/phase-plan.json
+      schema: dev/phase-plan@1
+    gates:
+      - phase_plan_approved
+defaultGates: []