fix: drop false-positive committed_reservation_for_existing_id integrity check

The rule flagged every committed reservation pointing at an existing task ID
as an anomaly, but that's the happy-path steady state — reservations
transition to `committed` immediately after the task row is inserted, so a
committed reservation is always expected to reference an existing task. On
any node with task history, the dashboard banner fired with hundreds of
"affected" IDs and the store emitted a spurious `[task-id-integrity] anomaly
detected` error log.

Removes the rule, its type/label/reader, and updates tests (core regression
guard now asserts committed reservations don't trigger anomalies; dashboard
server-test fixtures use a still-valid anomaly kind).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.changeset/fix-task-id-integrity-false-positive.md

@@ -0,0 +1,6 @@
+---
+"@fusion/core": patch
+"@fusion/dashboard": patch
+---
+
+Remove false-positive `committed_reservation_for_existing_id` task-ID-integrity check. The rule flagged every committed reservation that pointed at an existing task, but that's the happy-path steady state — a reservation transitions to `committed` immediately after the task row is inserted, so it's always expected to map to an existing ID. The banner was firing on every healthy node with task history.

packages/core/src/__tests__/task-id-integrity.test.ts

@@ -99,7 +99,7 @@ describe("detectTaskIdIntegrityAnomalies", () => {
     );
   });
 
-  it("detects committed reservations that target existing task IDs", () => {
+  it("does not flag committed reservations that point at existing task IDs (the happy-path steady state)", () => {
     const db = createDb();
     const now = new Date().toISOString();
     insertTask(db, "FN-103");
@@ -124,13 +124,8 @@ describe("detectTaskIdIntegrityAnomalies", () => {
 
     const report = detectTaskIdIntegrityAnomalies(db);
 
-    expect(report.anomalies).toContainEqual(
-      expect.objectContaining({
-        kind: "committed_reservation_for_existing_id",
-        prefix: "FN",
-        affectedIds: ["FN-103"],
-      }),
-    );
+    expect(report.status).toBe("ok");
+    expect(report.anomalies).toEqual([]);
   });
 
   it("detects active task rows whose prefix is outside distributed state", () => {

packages/core/src/task-id-integrity.ts

@@ -6,7 +6,6 @@ export type TaskIdIntegrityAnomalyKind =
   | "duplicate_active_id"
   | "id_in_active_and_archived"
   | "next_sequence_at_or_below_used"
-  | "committed_reservation_for_existing_id"
   | "task_row_outside_known_prefix";
 
 export interface TaskIdIntegrityAnomaly {
@@ -24,7 +23,6 @@ export interface TaskIdIntegrityReport {
 
 type TaskRow = { id: string; source: "tasks" | "archivedTasks" };
 type StateRow = { prefix: string; nextSequence: number };
-type ReservationRow = { prefix: string; taskId: string; status: string };
 type DuplicateRow = { id: string; duplicateCount: number };
 
 function parseTaskId(taskId: string): { prefix: string; sequence: number } | null {
@@ -79,20 +77,6 @@ function readStateRows(db: Database): StateRow[] {
   }
 }
 
-function readCommittedReservations(db: Database): ReservationRow[] {
-  if (!hasTable(db, "distributed_task_id_reservations")) {
-    return [];
-  }
-
-  try {
-    return db
-      .prepare("SELECT prefix, taskId, status FROM distributed_task_id_reservations WHERE status = 'committed'")
-      .all() as ReservationRow[];
-  } catch {
-    return [];
-  }
-}
-
 function readDuplicateActiveIds(db: Database): DuplicateRow[] {
   if (!hasTable(db, "tasks")) {
     return [];
@@ -215,24 +199,6 @@ export function detectTaskIdIntegrityAnomalies(db: Database): TaskIdIntegrityRep
       }
     }
 
-    const existingIds = new Set(allRows.map((row) => row.id));
-    const committedReservationsByPrefix = new Map<string, string[]>();
-    for (const row of readCommittedReservations(db)) {
-      if (!existingIds.has(row.taskId)) {
-        continue;
-      }
-      const prefix = row.prefix.trim().toUpperCase() || parseTaskId(row.taskId)?.prefix || "unknown";
-      committedReservationsByPrefix.set(prefix, [...(committedReservationsByPrefix.get(prefix) ?? []), row.taskId]);
-    }
-    for (const [prefix, affectedIds] of committedReservationsByPrefix) {
-      anomalies.push({
-        kind: "committed_reservation_for_existing_id",
-        prefix,
-        affectedIds: uniqueSorted(affectedIds),
-        details: `Committed reservation rows still reference task IDs that already exist for prefix ${prefix}.`,
-      });
-    }
-
     return buildReport(checkedAt, anomalies);
   } catch {
     return buildReport(checkedAt, []);

packages/dashboard/app/components/TaskIdIntegrityBanner.tsx

@@ -14,7 +14,6 @@ const ANOMALY_LABELS: Record<TaskIdIntegrityReport["anomalies"][number]["kind"],
   duplicate_active_id: "Duplicate active task ID",
   id_in_active_and_archived: "Task ID present in active and archived storage",
   next_sequence_at_or_below_used: "Allocator next sequence overlaps an existing task ID",
-  committed_reservation_for_existing_id: "Committed reservation still points at an existing task ID",
   task_row_outside_known_prefix: "Task row uses a prefix outside allocator state",
 };
 

packages/dashboard/src/__tests__/server.test.ts

@@ -440,10 +440,10 @@ describe("createServer health and headless mode", () => {
         checkedAt: "2026-05-12T11:00:00.000Z",
         anomalies: [
           {
-            kind: "committed_reservation_for_existing_id",
+            kind: "duplicate_active_id",
             prefix: "FN",
             affectedIds: ["FN-103"],
-            details: "reservation collision",
+            details: "duplicate row",
           },
         ],
       }),
@@ -468,10 +468,10 @@ describe("createServer health and headless mode", () => {
         checkedAt: "2026-05-12T11:00:00.000Z",
         anomalies: [
           {
-            kind: "committed_reservation_for_existing_id",
+            kind: "duplicate_active_id",
             prefix: "FN",
             affectedIds: ["FN-103"],
-            details: "reservation collision",
+            details: "duplicate row",
           },
         ],
         recommendedAction: