fix(cognitive): separate reachability from quality evidence

dev/ACTIVE_TASK.json

@@ -1,5 +1,5 @@
 {
-  "task_file": "dev/tasks/DEV-000218-automatic-expansion-policy.json",
-  "task_id": "DEV-000218",
+  "task_file": "dev/tasks/DEV-000219-reachability-not-quality.json",
+  "task_id": "DEV-000219",
   "task_revision": 1
 }

dev/tasks/DEV-000219-reachability-not-quality.json

@@ -0,0 +1,23 @@
+{
+  "task_id": "DEV-000219",
+  "task_revision": 1,
+  "architecture_revision": "ADR-0018",
+  "base_repo_revision": "7476f43ffa57d55f5a5a9bddc7f1c74e9b87ae0e",
+  "risk_tier": "E",
+  "intent": "Prevent task-evaluation invocation success from being recorded as semantic model quality or support without independent verifier evidence.",
+  "requirement_ids": ["truthful model evidence", "independent verification", "no false qualification"],
+  "allowed_change_scope": {"modules": ["cognitive-worker"], "paths": ["cmd/cognitive-worker/task_evaluation.go", "cmd/cognitive-worker/task_evaluation_test.go", "dev/ACTIVE_TASK.json", "dev/tasks/DEV-000219-reachability-not-quality.json"]},
+  "forbidden_change_scope": {"paths": ["architecture/**", "security/**", "database/**", "deploy/**", "contracts/**", "modules/**", "LLM-local/**"]},
+  "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},
+  "contracts": {"consume": ["TaskEvaluationExecutionRequest/Response", "TaskCaseObservation", "Cognitive Gateway"], "may_change": []},
+  "semantic_owner": "capability evidence remains owner; cognitive-worker only records invocation observation",
+  "canonical_state": ["existing task-evaluation evidence; no new persistence"],
+  "state_transitions": ["successful invocation -> UNKNOWN reachability observation", "independent verifier evidence -> future supported/quality observation"],
+  "side_effects_and_privileges": ["no additional provider calls or privileges"],
+  "persistence_and_migrations": ["none"],
+  "failure_retry_restart": ["unknown evidence remains retryable/eligible for a separately verified evaluation; no promotion follows invocation alone"],
+  "assumptions": ["a later verifier task will attach answer-quality evidence and score cases"],
+  "acceptance_scenarios": ["nonempty provider response is not SUPPORTED", "quality score remains zero", "provider invocation failure remains UNKNOWN with critical failure", "no model/hardware label can manufacture quality evidence"],
+  "required_tests": ["go test", "go vet", "preflight", "check-diff", "check-architecture", "independent", "git diff --check", "CI", "production public health check"],
+  "terminal_gap_states": ["BLOCKED_BY_MISSING_CAPABILITY", "BLOCKED_BY_SPEC_GAP"]
+}