test: stabilize dashboard PR repository fixtures (#1824)

## Summary
- Mocks `git remote get-url origin` for dashboard PR lifecycle tests via
`execFileSync`, matching the production repository resolver.
- Keeps the missing-repository error covered for cases where no project
remote is resolvable.
- Tightens dashboard PR lifecycle assertions so PR status checks use the
resolved owner/repo.

## Verification
- `corepack pnpm build` — pass
- `corepack pnpm --filter @runfusion/fusion exec vitest run
src/commands/__tests__/dashboard.test.ts --silent=passed-only
--reporter=dot --no-color` — pass, 86 tests
- `corepack pnpm --filter @runfusion/fusion exec vitest run
src/commands/__tests__/dashboard.test.ts -t
"processPullRequestMergeTask|PR-first auto-merge queue"
--silent=passed-only --reporter=dot --no-color` — pass, 7 tests
- Clean rebuilt stale bundled plugin dist, then `corepack pnpm --filter
@runfusion/fusion exec vitest run --changed
24d78816a0 --passWithNoTests
--silent=passed-only --reporter=dot --no-color` — pass, 75 files / 1186
tests
- `corepack pnpm check:changesets` — pass
- `corepack pnpm lint` — pass
- `corepack pnpm typecheck` — pass

No changeset: test-only fixture coverage; no package runtime behavior
changed.

## CI note
The current Gate failure is the pre-existing engine-core workflow
expectation drift fixed by PR #1822. Lint, Typecheck, Build, CodeRabbit,
and Greptile passed on this PR.


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Tests**
* Expanded dashboard and pull request merge coverage to verify
repository detection and merge-status handling across merge lifecycle
paths.
* Added a failure-path assertion for when the app can’t determine the
current repository, ensuring the operation stops and surfaces the
expected error.
* Improved assertions for auto-merge and manual merge flows to confirm
the correct repository lookup occurs in each scenario.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
## Current Gate status

`Gate` is failing on current `origin/main` before these PR changes. I
reproduced the same engine-core failures directly on `origin/main`
(`task-pipeline-smoke.test.ts` and
`workflow-graph-executor-parity.test.ts`, caused by the new
`completion-summary` / `post-merge-verification` default workflow
nodes). The PR-local review feedback is addressed and focused validation
passes; the remaining Gate failure should be fixed in the upstream
workflow-test drift PR, not copied into this PR branch.

packages/cli/src/commands/__tests__/dashboard.test.ts

@@ -261,6 +261,7 @@ vi.mock("@fusion/core", async (importOriginal) => {
 const {
   mockExec,
   mockExecSync,
+  mockExecFileSync,
   mockFindPrForBranch,
   mockCreatePr,
   mockGetPrMergeStatus,
@@ -282,6 +283,16 @@ const {
     };
   }),
   mockExecSync: vi.fn(() => ""),
+  mockExecFileSync: vi.fn((file: string, args: readonly string[] = [], options?: { cwd?: string }) => {
+    if (file === "git" && args.join(" ") === "remote get-url origin") {
+      const effectiveCwd = options?.cwd ?? process.cwd();
+      if (effectiveCwd !== "/repo" && effectiveCwd !== process.cwd()) {
+        throw new Error(`unexpected repository cwd: ${options?.cwd ?? "<unset>"}`);
+      }
+      return "https://github.com/owner/repo.git\n";
+    }
+    return "";
+  }),
   mockFindPrForBranch: vi.fn(),
   mockCreatePr: vi.fn(),
   mockGetPrMergeStatus: vi.fn(),
@@ -307,6 +318,7 @@ vi.mock("node:child_process", async (importOriginal) => {
     exec: mockExec,
     execSync: mockExecSync,
     execFile: mockExecFile,
+    execFileSync: mockExecFileSync,
   };
 });
 
@@ -861,6 +873,18 @@ function resetGitHubMocks() {
   mockCreatePr.mockReset();
   mockGetPrMergeStatus.mockReset();
   mockMergePr.mockReset();
+  mockExecFileSync.mockReset();
+
+  mockExecFileSync.mockImplementation((file: string, args: readonly string[] = [], options?: { cwd?: string }) => {
+    if (file === "git" && args.join(" ") === "remote get-url origin") {
+      const effectiveCwd = options?.cwd ?? process.cwd();
+      if (effectiveCwd !== "/repo" && effectiveCwd !== process.cwd()) {
+        throw new Error(`unexpected repository cwd: ${options?.cwd ?? "<unset>"}`);
+      }
+      return "https://github.com/owner/repo.git\n";
+    }
+    return "";
+  });
 
   mockFindPrForBranch.mockResolvedValue(null);
   mockCreatePr.mockResolvedValue({
@@ -1006,6 +1030,36 @@ describe("processPullRequestMergeTask", () => {
       expect.objectContaining({ number: 42, status: "open" }),
     );
     expect(store.updateTask).toHaveBeenCalledWith("FN-093", { status: "awaiting-pr-checks" });
+    expect(mockExecFileSync).toHaveBeenCalledWith(
+      "git",
+      ["remote", "get-url", "origin"],
+      expect.objectContaining({ cwd: "/repo" }),
+    );
+  });
+
+  it("keeps the production missing-repository error when no project remote is resolvable", async () => {
+    mockExecFileSync.mockImplementationOnce(() => {
+      throw new Error("not a git repository");
+    });
+    const store = makeMockStore();
+    store.getTask.mockResolvedValue({
+      id: "FN-093",
+      title: "Task",
+      description: "Description",
+      column: "in-review",
+      paused: false,
+      log: [],
+    });
+
+    await expect(processPullRequestMergeTask(store as any, "/repo", "FN-093", {
+      findPrForBranch: mockFindPrForBranch,
+      createPr: mockCreatePr,
+      getPrMergeStatus: mockGetPrMergeStatus,
+      mergePr: mockMergePr,
+    } as any, () => undefined)).rejects.toThrow("processPullRequestMergeTask: could not determine repository");
+
+    expect(mockCreatePr).not.toHaveBeenCalled();
+    expect(mockGetPrMergeStatus).not.toHaveBeenCalled();
   });
 
   it("links an existing PR instead of creating a duplicate", async () => {
@@ -1050,6 +1104,7 @@ describe("processPullRequestMergeTask", () => {
     } as any, mockGetTaskMergeBlocker);
 
     expect(mockCreatePr).not.toHaveBeenCalled();
+    expect(mockGetPrMergeStatus).toHaveBeenCalledWith("owner", "repo", 7);
     expect(store.logEntry).toHaveBeenCalledWith(
       "FN-093",
       "Linked existing PR",
@@ -1114,6 +1169,7 @@ describe("processPullRequestMergeTask", () => {
     } as any, mockGetTaskMergeBlocker);
 
     expect(result).toBe("merged");
+    expect(mockGetPrMergeStatus).toHaveBeenCalledWith("owner", "repo", 42);
     expect(mockMergePr).toHaveBeenCalledWith({ number: 42, method: "squash" });
     expect(store.moveTask).toHaveBeenCalledWith("FN-093", "done");
     // Check that exec was called with the expected commands (options object and callback may follow)
@@ -1177,6 +1233,7 @@ describe("processPullRequestMergeTask", () => {
     } as any, mockGetTaskMergeBlocker);
 
     expect(result).toBe("waiting");
+    expect(mockGetPrMergeStatus).toHaveBeenCalledWith("owner", "repo", 42);
     expect(mockMergePr).not.toHaveBeenCalled();
     expect(store.moveTask).not.toHaveBeenCalled();
     expect(store.updateTask).toHaveBeenCalledWith("FN-093", { status: "awaiting-pr-checks" });
@@ -1234,6 +1291,11 @@ describe("runDashboard — PR-first auto-merge queue", () => {
       head: "fusion/fn-093",
       base: "main",
     });
+    expect(mockExecFileSync).toHaveBeenCalledWith(
+      "git",
+      ["remote", "get-url", "origin"],
+      expect.objectContaining({ cwd: process.cwd() }),
+    );
     expect(aiMergeTask).not.toHaveBeenCalled();
   });
 
@@ -1263,6 +1325,11 @@ describe("runDashboard — PR-first auto-merge queue", () => {
       head: "fusion/fn-093",
       base: "main",
     });
+    expect(mockExecFileSync).toHaveBeenCalledWith(
+      "git",
+      ["remote", "get-url", "origin"],
+      expect.objectContaining({ cwd: process.cwd() }),
+    );
     expect(aiMergeTask).not.toHaveBeenCalled();
   });
 });