adapters/postgres/work_repository.go

@@ -199,6 +199,26 @@ func (r *WorkRepository) LoadWorkGraph(ctx context.Context, graphID string, revi
 	return graph, nil
 }
 
+func (r *WorkRepository) SaveGraphSynthesis(ctx context.Context, conflict work.ConflictSet, candidates []work.ResultCandidate, synthesis work.GraphSynthesisCandidate) error {
+	tx, err := r.pool.Begin(ctx)
+	if err != nil {
+		return err
+	}
+	defer tx.Rollback(ctx)
+	for _, candidate := range candidates {
+		if _, err := tx.Exec(ctx, `INSERT INTO work.graph_result_candidates(result_candidate_id,graph_id,graph_revision,node_id,author_run_id,artifact_refs,evidence_summary,summary) VALUES($1,$2,$3,$4,$5,$6,$7,$8) ON CONFLICT(result_candidate_id) DO NOTHING`, candidate.ID, candidate.GraphID, candidate.GraphRevision, candidate.NodeID, candidate.AuthorRunID, candidate.ArtifactRefs, candidate.EvidenceSummary, candidate.Summary); err != nil {
+			return err
+		}
+	}
+	if _, err := tx.Exec(ctx, `INSERT INTO work.graph_conflicts(conflict_id,graph_id,graph_revision,node_id,candidate_ids,resolved) VALUES($1,$2,$3,$4,$5,$6) ON CONFLICT(conflict_id) DO NOTHING`, conflict.ID, conflict.GraphID, conflict.GraphRevision, conflict.NodeID, conflict.CandidateIDs, conflict.Resolved); err != nil {
+		return err
+	}
+	if _, err := tx.Exec(ctx, `INSERT INTO work.graph_synthesis_candidates(synthesis_id,graph_id,graph_revision,node_id,candidate_ids,selected_candidate_id,dissent_candidate_ids,verifier_run_id,verifier_identity,evidence_refs,summary,state) VALUES($1,$2,$3,$4,$5,$6,$7,$8,$9,$10,$11,$12) ON CONFLICT(synthesis_id) DO NOTHING`, synthesis.ID, synthesis.GraphID, synthesis.GraphRevision, synthesis.NodeID, synthesis.CandidateIDs, synthesis.SelectedCandidateID, synthesis.DissentCandidateIDs, synthesis.VerifierRunID, synthesis.VerifierIdentity, synthesis.EvidenceRefs, synthesis.Summary, synthesis.State); err != nil {
+		return err
+	}
+	return tx.Commit(ctx)
+}
+
 func (r *WorkRepository) RecoverStaleClaims(ctx context.Context, nowUnixMillis, staleAfterMillis int64) (int64, error) {
 	command, err := r.pool.Exec(ctx, `UPDATE work.agent_dispatch_queue SET state='QUEUED',claimed_by='',updated_at_unix_millis=$1 WHERE state='CLAIMED' AND updated_at_unix_millis <= $2`, nowUnixMillis, nowUnixMillis-staleAfterMillis)
 	if err != nil {

cmd/work-graph-runtime/main.go

@@ -55,6 +55,19 @@ func main() {
 		}
 		writeJSON(w, graph)
 	})
+	mux.HandleFunc("POST /v1/work-graphs/synthesis", func(w http.ResponseWriter, r *http.Request) {
+		var request application.GraphSynthesisRequest
+		if err := json.NewDecoder(http.MaxBytesReader(w, r.Body, 4<<20)).Decode(&request); err != nil {
+			http.Error(w, "invalid graph synthesis request", http.StatusBadRequest)
+			return
+		}
+		conflict, synthesis, err := application.SynthesizeGraph(r.Context(), repository, request)
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusUnprocessableEntity)
+			return
+		}
+		writeJSON(w, map[string]any{"conflict": conflict, "synthesis": synthesis})
+	})
 	addr := os.Getenv("LISTEN_ADDR")
 	if addr == "" {
 		addr = ":8088"

database/migrations/036_work_graph_result_synthesis.sql

@@ -0,0 +1,58 @@
+BEGIN;
+
+SET ROLE work_role;
+
+CREATE TABLE IF NOT EXISTS work.graph_result_candidates (
+  result_candidate_id TEXT PRIMARY KEY,
+  graph_id TEXT NOT NULL,
+  graph_revision BIGINT NOT NULL,
+  node_id TEXT NOT NULL,
+  author_run_id TEXT NOT NULL,
+  artifact_refs TEXT[] NOT NULL DEFAULT ARRAY[]::TEXT[],
+  evidence_summary TEXT NOT NULL,
+  summary TEXT NOT NULL,
+  recorded_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  CHECK (result_candidate_id <> ''), CHECK (graph_id <> ''), CHECK (graph_revision > 0),
+  CHECK (node_id <> ''), CHECK (author_run_id <> ''), CHECK (evidence_summary <> ''), CHECK (summary <> ''),
+  FOREIGN KEY (graph_id, graph_revision) REFERENCES work.graphs(graph_id, revision)
+);
+
+CREATE TABLE IF NOT EXISTS work.graph_conflicts (
+  conflict_id TEXT PRIMARY KEY,
+  graph_id TEXT NOT NULL,
+  graph_revision BIGINT NOT NULL,
+  node_id TEXT NOT NULL,
+  candidate_ids TEXT[] NOT NULL,
+  resolved BOOLEAN NOT NULL DEFAULT FALSE,
+  recorded_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  CHECK (conflict_id <> ''), CHECK (graph_id <> ''), CHECK (graph_revision > 0), CHECK (node_id <> ''),
+  CHECK (cardinality(candidate_ids) >= 2),
+  FOREIGN KEY (graph_id, graph_revision) REFERENCES work.graphs(graph_id, revision)
+);
+
+CREATE TABLE IF NOT EXISTS work.graph_synthesis_candidates (
+  synthesis_id TEXT PRIMARY KEY,
+  graph_id TEXT NOT NULL,
+  graph_revision BIGINT NOT NULL,
+  node_id TEXT NOT NULL,
+  candidate_ids TEXT[] NOT NULL,
+  selected_candidate_id TEXT NOT NULL,
+  dissent_candidate_ids TEXT[] NOT NULL DEFAULT ARRAY[]::TEXT[],
+  verifier_run_id TEXT NOT NULL,
+  verifier_identity TEXT NOT NULL,
+  evidence_refs TEXT[] NOT NULL,
+  summary TEXT NOT NULL,
+  state TEXT NOT NULL,
+  recorded_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  CHECK (synthesis_id <> ''), CHECK (graph_id <> ''), CHECK (graph_revision > 0), CHECK (node_id <> ''),
+  CHECK (cardinality(candidate_ids) >= 2), CHECK (selected_candidate_id <> ''), CHECK (verifier_run_id <> ''),
+  CHECK (verifier_identity <> ''), CHECK (cardinality(evidence_refs) >= 1), CHECK (summary <> ''), CHECK (state = 'VERIFIED'),
+  FOREIGN KEY (graph_id, graph_revision) REFERENCES work.graphs(graph_id, revision)
+);
+
+CREATE INDEX IF NOT EXISTS graph_result_candidates_node_idx ON work.graph_result_candidates(graph_id, graph_revision, node_id);
+CREATE INDEX IF NOT EXISTS graph_conflicts_node_idx ON work.graph_conflicts(graph_id, graph_revision, node_id);
+CREATE INDEX IF NOT EXISTS graph_synthesis_node_idx ON work.graph_synthesis_candidates(graph_id, graph_revision, node_id);
+
+RESET ROLE;
+COMMIT;

dev/ACTIVE_TASK.json

@@ -1,5 +1,5 @@
 {
-  "task_file": "dev/tasks/DEV-000188-graph-synthesis-independent-verifier.json",
-  "task_id": "DEV-000188",
+  "task_file": "dev/tasks/DEV-000189-durable-graph-synthesis-runtime.json",
+  "task_id": "DEV-000189",
   "task_revision": 1
 }

dev/tasks/DEV-000189-durable-graph-synthesis-runtime.json

@@ -0,0 +1,23 @@
+{
+  "task_id": "DEV-000189",
+  "task_revision": 1,
+  "architecture_revision": "ADR-0018",
+  "base_repo_revision": "41bc4b5",
+  "risk_tier": "E",
+  "intent": "Persist Work Graph result candidates, conflicts and independently verified synthesis through the work owner and expose the governed synthesis runtime path.",
+  "requirement_ids": ["WP-403", "Durable graph result evidence", "Durable conflict resolution", "Synthesis runtime endpoint"],
+  "allowed_change_scope": {"modules": ["work-agent-execution", "work-storage", "work-graph-runtime"], "paths": ["database/migrations/036_work_graph_result_synthesis.sql", "adapters/postgres/work_repository.go", "modules/work/ports/graph.go", "modules/work/application/graph_runtime.go", "cmd/work-graph-runtime/main.go", "tests/agent_execution/graph_persistence_sql_test.go", "tests/agent_execution/graph_runtime_test.go", "dev/ACTIVE_TASK.json", "dev/tasks/DEV-000189-durable-graph-synthesis-runtime.json"]},
+  "forbidden_change_scope": {"paths": ["architecture/**", "security/**", "contracts/authority/**", "modules/epistemics/**", "deploy/**", ".gitea/**"]},
+  "allowed_architecture_delta": {"new_cross_module_dependencies": 0, "new_canonical_owners": 0, "new_privileges": 0, "new_third_party_dependencies": 0, "new_database_owner_roles": 1},
+  "contracts": {"consume": ["Existing Work Graph ResultCandidate/ConflictSet/GraphSynthesisCandidate contracts", "WP-403 independent verifier gate"], "may_change": ["GraphStore persistence port"]},
+  "semantic_owner": "work-agent-execution",
+  "canonical_state": ["work.graph_result_candidates", "work.graph_conflicts", "work.graph_synthesis_candidates"],
+  "state_transitions": ["result candidate append -> conflict append -> independently verified synthesis append", "failed verification does not persist a resolved synthesis"],
+  "side_effects_and_privileges": ["Work schema writes only; no external mutation, provider call, secret expansion, or authority change"],
+  "persistence_and_migrations": ["Append-only migration 036; one owner-local transaction persists candidates, conflict and synthesis"],
+  "failure_retry_restart": ["Idempotent exact-record inserts; transaction rollback preserves no partial resolution; restart reloads durable evidence"],
+  "assumptions": ["Production migration runner applies migration before runtime endpoint use", "Authenticated upstream boundary already protects runtime access"],
+  "acceptance_scenarios": ["SQL is revision scoped and work-owned", "runtime rejects invalid/self-verifying synthesis", "successful synthesis persists all candidates, dissent and verifier identity atomically", "production canary returns durable success without external side effect"],
+  "required_tests": ["go test ./...", "go vet ./...", "go run ./cmd/devctl preflight -task dev/tasks/DEV-000189-durable-graph-synthesis-runtime.json", "go run ./cmd/devctl check-diff -task dev/tasks/DEV-000189-durable-graph-synthesis-runtime.json", "go run ./cmd/devctl check-architecture", "go run ./cmd/devctl independent", "git diff --check", "CI", "production migration/readiness and authenticated synthesis canary"],
+  "terminal_gap_states": ["BLOCKED_BY_MIGRATION_DECISION", "BLOCKED_BY_SPEC_GAP", "BLOCKED_BY_CONFLICT"]
+}

modules/work/application/graph_runtime.go

@@ -25,6 +25,28 @@ type GraphCompleteRequest struct {
 	Succeeded bool             `json:"succeeded"`
 }
 
+type GraphSynthesisRequest struct {
+	Conflict          work.ConflictSet       `json:"conflict"`
+	Candidates        []work.ResultCandidate `json:"candidates"`
+	SelectedCandidate string                 `json:"selected_candidate_id"`
+	VerifierRunID     work.AgentRunID        `json:"verifier_run_id"`
+	VerifierIdentity  string                 `json:"verifier_identity"`
+	EvidenceRefs      []work.EvidenceRef     `json:"evidence_refs"`
+	Summary           string                 `json:"summary"`
+	Verified          bool                   `json:"verified"`
+}
+
+func SynthesizeGraph(ctx context.Context, store ports.GraphResultStore, request GraphSynthesisRequest) (work.ConflictSet, work.GraphSynthesisCandidate, error) {
+	conflict, synthesis, err := domain.BuildVerifiedGraphSynthesis(request.Conflict, request.Candidates, request.SelectedCandidate, request.VerifierRunID, request.VerifierIdentity, request.EvidenceRefs, request.Summary, request.Verified)
+	if err != nil {
+		return work.ConflictSet{}, work.GraphSynthesisCandidate{}, err
+	}
+	if err := store.SaveGraphSynthesis(ctx, conflict, request.Candidates, synthesis); err != nil {
+		return work.ConflictSet{}, work.GraphSynthesisCandidate{}, err
+	}
+	return conflict, synthesis, nil
+}
+
 func AdmitAndSchedule(ctx context.Context, store ports.GraphStore, request GraphScheduleRequest) (work.WorkGraph, []work.GraphNodeID, error) {
 	if request.Now < 1 {
 		request.Now = time.Now().UnixMilli()

modules/work/ports/graph.go

@@ -12,3 +12,7 @@ type GraphStore interface {
 	SaveDispatchIntent(context.Context, work.AgentDispatchIntent) error
 	EnqueueDispatch(context.Context, work.AgentDispatchQueueItem) error
 }
+
+type GraphResultStore interface {
+	SaveGraphSynthesis(context.Context, work.ConflictSet, []work.ResultCandidate, work.GraphSynthesisCandidate) error
+}

tests/agent_execution/graph_persistence_sql_test.go

@@ -18,3 +18,16 @@ func TestGraphPersistenceMigrationIsRevisionScoped(t *testing.T) {
 		}
 	}
 }
+
+func TestGraphSynthesisMigrationIsWorkOwnedAndAtomicInputsExist(t *testing.T) {
+	data, err := os.ReadFile("../../database/migrations/036_work_graph_result_synthesis.sql")
+	if err != nil {
+		t.Fatal(err)
+	}
+	sql := string(data)
+	for _, marker := range []string{"work.graph_result_candidates", "work.graph_conflicts", "work.graph_synthesis_candidates", "verifier_run_id", "dissent_candidate_ids", "FOREIGN KEY (graph_id, graph_revision)", "SET ROLE work_role"} {
+		if !strings.Contains(sql, marker) {
+			t.Fatalf("graph synthesis persistence marker missing: %s", marker)
+		}
+	}
+}

tests/agent_execution/graph_runtime_test.go

@@ -58,3 +58,26 @@ func TestGraphRuntimeSchedulesFanOutAndCompletesFanIn(t *testing.T) {
 		t.Fatalf("completed=%+v err=%v", completed, err)
 	}
 }
+
+type graphResultStoreStub struct {
+	conflict work.ConflictSet
+	count    int
+}
+
+func (s *graphResultStoreStub) SaveGraphSynthesis(_ context.Context, conflict work.ConflictSet, candidates []work.ResultCandidate, _ work.GraphSynthesisCandidate) error {
+	s.conflict = conflict
+	s.count = len(candidates)
+	return nil
+}
+
+func TestSynthesizeGraphPersistsVerifiedDissent(t *testing.T) {
+	store := &graphResultStoreStub{}
+	conflict, synthesis, err := application.SynthesizeGraph(context.Background(), store, application.GraphSynthesisRequest{
+		Conflict:          work.ConflictSet{ID: "conflict-1", GraphID: "graph-1", GraphRevision: 1, NodeID: "node-1", CandidateIDs: []string{"candidate-a", "candidate-b"}},
+		Candidates:        []work.ResultCandidate{{ID: "candidate-a", GraphID: "graph-1", GraphRevision: 1, NodeID: "node-1", AuthorRunID: "producer-a", EvidenceSummary: "a", Summary: "a"}, {ID: "candidate-b", GraphID: "graph-1", GraphRevision: 1, NodeID: "node-1", AuthorRunID: "producer-b", EvidenceSummary: "b", Summary: "b"}},
+		SelectedCandidate: "candidate-a", VerifierRunID: "verifier-1", VerifierIdentity: "independent", EvidenceRefs: []work.EvidenceRef{"tests:1"}, Summary: "verified", Verified: true,
+	})
+	if err != nil || !conflict.Resolved || synthesis.State != work.GraphSynthesisVerified || store.count != 2 || !store.conflict.Resolved {
+		t.Fatalf("unexpected runtime synthesis: conflict=%+v synthesis=%+v stored=%+v err=%v", conflict, synthesis, store.conflict, err)
+	}
+}