feat(FN-676): fix mission route typing and add regression coverage

- Tighten mission route status validation with generic typing to preserve exact status unions
- Expand mission API end-to-end coverage for feature patching, invalid statuses, and task unlink support in the mock store
- Point dashboard Vitest core alias at the package index so mission route tests resolve the full mission store API
- Add a changeset for the sticky New Task modal action button position fix

packages/dashboard/src/mission-e2e.test.ts

@@ -175,6 +175,19 @@ function createMockMissionStore() {
       return updated;
     }),
 
+    updateFeature: vi.fn((id: string, updates: Partial<MissionFeature>) => {
+      const feature = features.get(id);
+      if (!feature) throw new Error("Feature " + id + " not found");
+      const updated = { ...feature, ...updates, updatedAt: new Date().toISOString() };
+      features.set(id, updated);
+      return updated;
+    }),
+
+    deleteFeature: vi.fn((id: string) => {
+      if (!features.has(id)) throw new Error("Feature " + id + " not found");
+      features.delete(id);
+    }),
+
     linkFeatureToTask: vi.fn((featureId: string, taskId: string) => {
       const feature = features.get(featureId);
       if (!feature) throw new Error("Feature " + featureId + " not found");
@@ -183,6 +196,14 @@ function createMockMissionStore() {
       return updated;
     }),
 
+    unlinkFeatureFromTask: vi.fn((featureId: string) => {
+      const feature = features.get(featureId);
+      if (!feature) throw new Error("Feature " + featureId + " not found");
+      const updated = { ...feature, taskId: undefined, status: "defined" as const, updatedAt: new Date().toISOString() };
+      features.set(featureId, updated);
+      return updated;
+    }),
+
     reorderMilestones: vi.fn(),
     reorderSlices: vi.fn(),
 
@@ -391,7 +412,56 @@ describe("Mission API", () => {
     });
   });
 
-  describe("Feature linking", () => {
+  describe("Feature routes", () => {
+    it("should patch a feature status using a normalized featureId string", async () => {
+      const { app, missionStore } = buildApp();
+      const mission = missionStore.createMission({ title: "Test Mission" });
+      const milestone = missionStore.addMilestone(mission.id, { title: "Test Milestone" });
+      const slice = missionStore.addSlice(milestone.id, { title: "Test Slice" });
+      const feature = missionStore.addFeature(slice.id, { title: "Test Feature" });
+
+      const res = await request(
+        app,
+        "PATCH",
+        `/api/missions/features/${feature.id}`,
+        JSON.stringify({ status: "triaged", acceptanceCriteria: "Shippable" }),
+        { "content-type": "application/json" }
+      );
+
+      expect(res.status).toBe(200);
+      expect(res.body.id).toBe(feature.id);
+      expect(res.body.status).toBe("triaged");
+      expect(res.body.acceptanceCriteria).toBe("Shippable");
+      expect(missionStore.updateFeature).toHaveBeenCalledWith(feature.id, {
+        status: "triaged",
+        acceptanceCriteria: "Shippable",
+      });
+    });
+
+    it("should reject invalid feature status values", async () => {
+      const { app, missionStore } = buildApp();
+      const mission = missionStore.createMission({ title: "Test Mission" });
+      const milestone = missionStore.addMilestone(mission.id, { title: "Test Milestone" });
+      const slice = missionStore.addSlice(milestone.id, { title: "Test Slice" });
+      const feature = missionStore.addFeature(slice.id, { title: "Test Feature" });
+
+      app.use((err: Error, _req: express.Request, res: express.Response, _next: express.NextFunction) => {
+        res.status(500).json({ error: err.message });
+      });
+
+      const res = await request(
+        app,
+        "PATCH",
+        `/api/missions/features/${feature.id}`,
+        JSON.stringify({ status: "complete" }),
+        { "content-type": "application/json" }
+      );
+
+      expect(res.status).toBe(500);
+      expect(res.body.error).toContain("Invalid status");
+      expect(missionStore.updateFeature).not.toHaveBeenCalled();
+    });
+
     it("should link feature to task", async () => {
       const { app, missionStore } = buildApp();
       const mission = missionStore.createMission({ title: "Test Mission" });

packages/dashboard/src/mission-routes.ts

@@ -23,10 +23,6 @@ import type {
   MilestoneCreateInput,
   SliceCreateInput,
   FeatureCreateInput,
-  MissionStatus,
-  MilestoneStatus,
-  SliceStatus,
-  FeatureStatus,
   InterviewState,
 } from "@fusion/core";
 import {
@@ -83,14 +79,14 @@ function validateDescription(desc: unknown): string | undefined {
   return desc.trim() || undefined;
 }
 
-function validateStatus(status: unknown, allowedStatuses: readonly string[]): string {
+function validateStatus<TStatus extends string>(status: unknown, allowedStatuses: readonly TStatus[]): TStatus {
   if (!status || typeof status !== "string") {
     throw new Error(`Status is required and must be one of: ${allowedStatuses.join(", ")}`);
   }
-  if (!allowedStatuses.includes(status)) {
+  if (!allowedStatuses.includes(status as TStatus)) {
     throw new Error(`Invalid status. Must be one of: ${allowedStatuses.join(", ")}`);
   }
-  return status;
+  return status as TStatus;
 }
 
 function validateInterviewState(state: unknown): InterviewState {
@@ -228,7 +224,7 @@ export function createMissionRouter(store: TaskStore): Router {
         updates.description = validateDescription(description);
       }
       if (status !== undefined) {
-        updates.status = validateStatus(status, MISSION_STATUSES) as MissionStatus;
+        updates.status = validateStatus(status, MISSION_STATUSES);
       }
 
       if (Object.keys(updates).length === 0) {
@@ -510,7 +506,7 @@ export function createMissionRouter(store: TaskStore): Router {
         updates.description = validateDescription(description);
       }
       if (status !== undefined) {
-        updates.status = validateStatus(status, MILESTONE_STATUSES) as MilestoneStatus;
+        updates.status = validateStatus(status, MILESTONE_STATUSES);
       }
       if (dependencies !== undefined) {
         updates.dependencies = validateStringArray(dependencies, "dependencies");
@@ -768,7 +764,7 @@ export function createMissionRouter(store: TaskStore): Router {
         updates.description = validateDescription(description);
       }
       if (status !== undefined) {
-        updates.status = validateStatus(status, SLICE_STATUSES) as SliceStatus;
+        updates.status = validateStatus(status, SLICE_STATUSES);
       }
 
       if (Object.keys(updates).length === 0) {
@@ -955,7 +951,7 @@ export function createMissionRouter(store: TaskStore): Router {
         updates.acceptanceCriteria = validateDescription(acceptanceCriteria);
       }
       if (status !== undefined) {
-        updates.status = validateStatus(status, FEATURE_STATUSES) as FeatureStatus;
+        updates.status = validateStatus(status, FEATURE_STATUSES);
       }
 
       if (Object.keys(updates).length === 0) {

packages/dashboard/vitest.config.ts

@@ -8,7 +8,7 @@ export default defineConfig({
   plugins: [react()],
   resolve: {
     alias: {
-      "@fusion/core": resolve(__dirname, "../core/src/types.ts"),
+      "@fusion/core": resolve(__dirname, "../core/src/index.ts"),
     },
   },
   test: {