chore: activate generic agent execution task

dev/ACTIVE_TASK.json

@@ -1,5 +1,5 @@
 {
-  "task_file": "dev/tasks/DEV-000279-live-audit-matrix-reconciliation.json",
-  "task_id": "DEV-000279",
+  "task_file": "dev/tasks/DEV-000280-local-generic-agent-execution.json",
+  "task_id": "DEV-000280",
   "task_revision": 1
 }

dev/tasks/DEV-000280-local-generic-agent-execution.json

@@ -3,12 +3,12 @@
   "task_revision": 1,
   "architecture_revision": "ADR-0018",
   "base_repo_revision": "51db637",
-  "risk_tier": "C",
+  "risk_tier": "E",
   "intent": "Add a typed local generic cognitive specialist execution path for Work Graph nodes, preserving independent verification and durable recovery semantics.",
   "requirement_ids": ["generic local agent execution", "candidate output is not verified fact", "work graph callback remains independently verifiable"],
   "allowed_change_scope": {
     "modules": ["work"],
-    "paths": ["contracts/work/bridge.go", "contracts/work/lease.go", "adapters/postgres/work_repository.go", "cmd/agent-execution-bridge/**", "cmd/agent-worker/**", "tests/agent_execution/**", "dev/tasks/DEV-000280-local-generic-agent-execution.json"]
+    "paths": ["contracts/work/bridge.go", "contracts/work/lease.go", "adapters/postgres/work_repository.go", "cmd/agent-execution-bridge/**", "cmd/agent-worker/**", "tests/agent_execution/**", "dev/ACTIVE_TASK.json", "dev/tasks/DEV-000280-local-generic-agent-execution.json"]
   },
   "forbidden_change_scope": {"paths": ["architecture/**", "security/**", "database/**", "modules/identity/**", "modules/authority/**", "LLM-local/**", "deploy/**"]},
   "allowed_architecture_delta": {"new_cross_module_dependencies": 0, "new_canonical_owners": 0, "new_privileges": 0, "new_third_party_dependencies": 0, "new_database_owner_roles": 0},