test(sync): update stale tests to current pipeline contracts

Four sync tests had been failing for a while (CI doesn't run them, so
nobody noticed). All four asserted behavior that was deliberately
changed by earlier refactors — the production code is correct:

- Three event-pipeline tests still expected message.part.updated events
  to coalesce in the queue. That coalescing was removed in #1167 to
  preserve part update ordering (the new contract is covered by
  event-pipeline.test.ts). Updated the delta-ordering and no-coalescing
  expectations, and switched the routes-before-queueing test to
  session.status, which is still a coalescible type, so it keeps
  proving that coalescing happens on the resolved directory.
- One session-ui-store test expected shell sends to run inside an
  opencodeClient.withDirectory scope. Since #1228 the session directory
  travels as an explicit request param on shellSession; the test now
  asserts that contract directly.

All 165 sync tests pass.

packages/ui/src/sync/__tests__/event-pipeline.test.js

@@ -320,7 +320,8 @@ describe('createEventPipeline', () => {
           },
         },
       },
-      // T2: message.part.updated for part-A — coalesces with T0
+      // T2: a newer message.part.updated for part-A — delivered as its own
+      // event (part.updated is never coalesced, ordering is preserved).
       {
         payload: {
           type: 'message.part.updated',
@@ -337,7 +338,7 @@ describe('createEventPipeline', () => {
         sdk,
         onEvent: (dir, payload) => {
           received.push({ directory: dir, payload });
-          if (received.length === 2) {
+          if (received.length === 3) {
             cleanup();
             releaseStream();
             resolve();
@@ -348,10 +349,11 @@ describe('createEventPipeline', () => {
 
     await delivered;
 
-    expect(received.length).toBe(2);
+    expect(received.length).toBe(3);
     expect(received[0].payload.type).toBe('message.part.updated');
     expect(received[1].payload.type).toBe('message.part.delta');
     expect(received[1].payload.properties.delta).toBe(' world');
+    expect(received[2].payload.type).toBe('message.part.updated');
   });
 
   it('keeps delta events for other fields on the same part', async () => {
@@ -416,7 +418,7 @@ describe('createEventPipeline', () => {
     expect(received[1].payload.properties.delta).toBe('hello');
   });
 
-  it('coalesces message.part.updated events for the same part', async () => {
+  it('delivers every message.part.updated for the same part (never coalesced)', async () => {
     installDomStubs();
 
     let releaseStream;
@@ -427,6 +429,8 @@ describe('createEventPipeline', () => {
     const received = [];
     const directory = '/test/dir';
 
+    // part.updated snapshots must all reach the reducer in order — coalescing
+    // them can drop intermediate states deltas depend on (see PR #1167).
     const sdk = createSdkWithEvents([
       {
         payload: {
@@ -453,18 +457,20 @@ describe('createEventPipeline', () => {
         sdk,
         onEvent: (dir, payload) => {
           received.push({ directory: dir, payload });
-          cleanup();
-          releaseStream();
-          resolve();
+          if (received.length === 2) {
+            cleanup();
+            releaseStream();
+            resolve();
+          }
         },
       });
     });
 
     await delivered;
 
-    // Only 1 event should be delivered (coalesced)
-    expect(received.length).toBe(1);
+    expect(received.length).toBe(2);
     expect(received[0].payload.type).toBe('message.part.updated');
+    expect(received[1].payload.type).toBe('message.part.updated');
   });
 
   it('routes events before queueing so coalescing happens on the resolved directory', async () => {
@@ -475,23 +481,28 @@ describe('createEventPipeline', () => {
       releaseStream = resolve;
     });
 
+    // Two coalescible session.status events for the same session arrive on
+    // different transport directories; routing resolves both to the same
+    // directory, so they must land in one queue and coalesce to the latest.
     const received = [];
     const sdk = createSdkWithEvents([
       {
         directory: 'global',
         payload: {
-          type: 'message.part.updated',
+          type: 'session.status',
           properties: {
-            part: { id: 'part-A', type: 'text', messageID: 'msg-1' },
+            sessionID: 'session-1',
+            status: { type: 'busy' },
           },
         },
       },
       {
         directory: '/real-dir',
         payload: {
-          type: 'message.part.updated',
+          type: 'session.status',
           properties: {
-            part: { id: 'part-A', type: 'text', messageID: 'msg-1', text: 'next' },
+            sessionID: 'session-1',
+            status: { type: 'idle' },
           },
         },
       },
@@ -501,7 +512,7 @@ describe('createEventPipeline', () => {
       const { cleanup } = createEventPipeline({
         sdk,
         routeDirectory: (directory, payload) => {
-          if (payload.type === 'message.part.updated') {
+          if (payload.type === 'session.status') {
             return '/resolved-dir';
           }
           return directory;
@@ -519,8 +530,8 @@ describe('createEventPipeline', () => {
 
     expect(received).toHaveLength(1);
     expect(received[0].directory).toBe('/resolved-dir');
-    expect(received[0].payload.type).toBe('message.part.updated');
-    expect(received[0].payload.properties.part.text).toBe('next');
+    expect(received[0].payload.type).toBe('session.status');
+    expect(received[0].payload.properties.status.type).toBe('idle');
   });
 
   it('consumes websocket message stream frames when transport is ws', async () => {