fix(e2e): restore project-collab P0 gate and collab mock seeding

PerishCode correctly blocked the follow-up that retagged the multi-client
convergence specs as P1 and dropped project-collab from the merge-gated UI P0
matrix: those two cases are the only browser coverage for live two-client
content/presence/unshare and authority-revocation convergence.

- Restore [P0] tags, the project-collab group/matrix/coverage entries, and the
  six-domain / four-domain shadow contracts (matches main).
- Teach collab-cluster unit mocks about addInitScript so the campaign-
  dismissal seed on independently created BrowserContexts does not break E2E
  Vitest.

e2e/lib/playwright/suites.ts

@@ -62,6 +62,17 @@ export const uiP0Groups = {
       "ui/workspace-team-design-system-picker.test.ts",
     ],
   },
+  // Split out of "project-workspace" (2026-08-04): the two multi-client collab
+  // specs alone accounted for ~10 of that group's ~26min single-worker wall
+  // time (workspace-multi-client-collab.test.ts spins up two isolated
+  // client/daemon runtimes per case). Keep this shard limited to the cluster-
+  // owned spec so it does not also boot the default worker runtime needed by
+  // ordinary UI files.
+  "project-collab": {
+    grep: String.raw`\[P0\]`,
+    workers: 1,
+    files: ["ui/workspace-multi-client-collab.test.ts"],
+  },
   "project-runtime": {
     grep: String.raw`\[P0\]`,
     workers: 1,
@@ -80,6 +91,7 @@ export const uiP0CiMatrix = [
   { name: "entry-settings", shard: "entry-settings" },
   { name: "project-workspace", shard: "project-workspace" },
   { name: "project-workspace-editor", shard: "project-workspace-editor" },
+  { name: "project-collab", shard: "project-collab" },
   { name: "project-runtime", shard: "project-runtime" },
   { name: "workspace-restoration", shard: "workspace-restoration" },
 ] as const satisfies readonly UiP0CiMatrixEntry[];
@@ -108,6 +120,7 @@ const uiP0CoverageFiles = [
   "ui/settings-connectors-auth-recovery.test.ts",
   "ui/settings-local-cli-codex-fallback.test.ts",
   "ui/workspace-team-interactions.test.ts",
+  "ui/workspace-multi-client-collab.test.ts",
   "ui/workspace-team-design-system-picker.test.ts",
   "ui/workspace-keyboard-flows.test.ts",
 ] as const;

e2e/tests/collab-cluster.test.ts

@@ -114,6 +114,9 @@ describe('createCollabCluster acquisition cleanup', () => {
     expect(secondSpec.root).toContain(runtimeMocks.workspaceRoot);
     expect(firstSpec.dataDir).toBe(join(firstSpec.root, 'scratch', 'data'));
     expect(secondSpec.dataDir).toBe(join(secondSpec.root, 'scratch', 'data'));
+    // Isolated cluster contexts never pass through the suite fixture, so
+    // campaign dismissal must be seeded on each newContext result — and
+    // before newPage, so the init script is installed for the first load.
     expect(firstContext.addInitScript).toHaveBeenCalledTimes(1);
     expect(secondContext.addInitScript).toHaveBeenCalledTimes(1);
     expect(firstContext.addInitScript.mock.invocationCallOrder[0]).toBeLessThan(

e2e/tests/packaged-smoke-workflow.test.ts

@@ -1220,6 +1220,7 @@ process.stdin.on("end", () => {
       "entry-settings",
       "project-workspace",
       "project-workspace-editor",
+      "project-collab",
       "project-runtime",
       "workspace-restoration",
     ]);
@@ -1238,6 +1239,10 @@ process.stdin.on("end", () => {
         "ui/workspace-team-design-system-picker.test.ts",
       ],
     });
+    expect(uiP0Groups["project-collab"].files).toEqual([
+      "ui/workspace-multi-client-collab.test.ts",
+    ]);
+    expect(uiP0Groups["project-collab"].workers).toBe(1);
     expect(uiP0Groups["critical-extras"]).toEqual({
       grep: "@merge-extra",
       workers: 1,

e2e/tests/scripts/scopes.test.ts

@@ -947,7 +947,7 @@ test("merge-queue threshold escalates medium-confidence files to the full radius
   });
 });
 
-test("runtime-definition changes produce only a three-shard UI P0 shadow candidate", async () => {
+test("runtime-definition changes produce only a four-domain UI P0 shadow candidate", async () => {
   const { evaluateUiP0Shadow } = await import("../../../scripts/scopes.ts");
   const decision = evaluateUiP0Shadow([
     "apps/daemon/src/runtimes/defs/atomcode.ts",
@@ -958,7 +958,7 @@ test("runtime-definition changes produce only a three-shard UI P0 shadow candida
   assert.equal(decision.capability, "daemon-runtime-definition");
   assert.deepEqual(
     decision.matrix.map((entry) => entry.name),
-    ["entry-settings", "project-workspace", "project-runtime"],
+    ["entry-settings", "project-workspace", "project-collab", "project-runtime"],
   );
   assert.deepEqual(decision.outsideCapabilityFiles, []);
 });
@@ -979,6 +979,7 @@ test("runtime-definition shadow fails closed for mixed, unknown, empty, and unre
         "entry-settings",
         "project-workspace",
         "project-workspace-editor",
+        "project-collab",
         "project-runtime",
         "workspace-restoration",
       ],
@@ -1031,7 +1032,7 @@ test("plan trace reports the runtime-definition UI P0 shadow without changing th
   assert.equal(result.trace.uiP0Shadow.mode, "candidate");
   assert.deepEqual(
     result.trace.uiP0Shadow.matrix.map((entry) => entry.name),
-    ["entry-settings", "project-workspace", "project-runtime"],
+    ["entry-settings", "project-workspace", "project-collab", "project-runtime"],
   );
 });
 

e2e/ui/workspace-multi-client-collab.test.ts

@@ -34,7 +34,7 @@ const MEMBER = {
 
 test.describe.configure({ timeout: T.xlong * 5 });
 
-test('[P1] two isolated clients converge live content, presence, and owner unshare', async ({
+test('[P0] two isolated clients converge live content, presence, and owner unshare', async ({
   browser,
 }, testInfo) => {
   const hubRoot = testInfo.outputPath('fake-collab-hub');
@@ -334,7 +334,7 @@ test('[P1] two isolated clients converge live content, presence, and owner unsha
   }
 });
 
-test('[P1] two active clients converge when a member gains then loses admin access', async ({
+test('[P0] two active clients converge when a member gains then loses admin access', async ({
   browser,
 }, testInfo) => {
   const hubRoot = testInfo.outputPath('fake-role-change-hub');

scripts/lib/guard/scope.ts

@@ -19,12 +19,14 @@ const fullMatrixNames = [
   "entry-settings",
   "project-workspace",
   "project-workspace-editor",
+  "project-collab",
   "project-runtime",
   "workspace-restoration",
 ] as const;
 const candidateMatrixNames = [
   "entry-settings",
   "project-workspace",
+  "project-collab",
   "project-runtime",
 ] as const;
 
@@ -39,7 +41,7 @@ function sameValues(actual: readonly string[], expected: readonly string[]): boo
 export function uiP0ShadowContractErrors(): string[] {
   const errors: string[] = [];
   if (!sameValues(matrixNames(uiP0CiMatrix), fullMatrixNames)) {
-    errors.push("the applied UI P0 matrix is no longer the guarded full five-shard matrix");
+    errors.push("the applied UI P0 matrix is no longer the guarded full six-domain matrix");
   }
 
   const sourceSample = `${DAEMON_RUNTIME_DEFINITION_PREFIXES[0]}example.ts`;
@@ -50,7 +52,7 @@ export function uiP0ShadowContractErrors(): string[] {
     candidate.capability !== "daemon-runtime-definition" ||
     !sameValues(matrixNames(candidate.matrix), candidateMatrixNames)
   ) {
-    errors.push("the runtime-definition shadow no longer resolves to the guarded three-shard candidate");
+    errors.push("the runtime-definition shadow no longer resolves to the guarded four-domain candidate");
   }
 
   for (const outsideFile of [

scripts/scopes.ts

@@ -74,6 +74,7 @@ export const DAEMON_RUNTIME_DEFINITION_EXACT = [
 const DAEMON_RUNTIME_DEFINITION_MATRIX_NAMES = [
   "entry-settings",
   "project-workspace",
+  "project-collab",
   "project-runtime",
 ] as const;