fix(orchestration): keep dispatch.task_id on the workerShow receipt

exposeDispatchContext renamed task_id to taskId, and every shipped CLI
prints value.dispatch.task_id, so an older paired CLI against an updated
host printed task=undefined. Publish both spellings. exposeWorker's dropped
columns have no reader in main's src/cli, which reads only state and stage.

src/main/runtime/rpc/methods/orchestration/worker/worker-observation.test.ts

@@ -119,7 +119,31 @@ describe('worker-show receipt shape', () => {
     expect(exposed).not.toHaveProperty('host_scope')
     expect(exposed).not.toHaveProperty('launch_token_hash')
     expect(exposed).not.toHaveProperty('capability_hash')
-    // The row shipped raw beside a camelCase `worker`; no snake_case key may survive.
-    expect(Object.keys(exposed).filter((key) => key.includes('_'))).toEqual([])
+    // The row shipped raw beside a camelCase `worker`; only the one spelling an older
+    // paired CLI still prints may survive.
+    expect(Object.keys(exposed).filter((key) => key.includes('_'))).toEqual(['task_id'])
+  })
+
+  // A paired CLI and host update independently, so an older CLI reads this receipt.
+  // These are the fields it prints: src/cli/handlers/orchestration/
+  // worker-observation-handlers.ts:18-19,25.
+  it('keeps every field an older paired CLI prints', () => {
+    const dispatch = exposeDispatchContext({
+      id: DISPATCH_ID,
+      run_id: 'run-1',
+      task_id: 'task-1',
+      status: 'dispatched'
+    } as DispatchContextRow)
+
+    expect(dispatch).toMatchObject({ id: DISPATCH_ID, task_id: 'task-1', status: 'dispatched' })
+    expect(
+      exposeWorker({
+        state: 'ready',
+        stage: 'input_accepted',
+        effects: '[]',
+        residual_resources: '[]',
+        start_options: '{}'
+      } as WorkerDispatchRow)
+    ).toMatchObject({ state: 'ready', stage: 'input_accepted' })
   })
 })

src/main/runtime/rpc/methods/orchestration/worker/worker-observation.ts

@@ -123,6 +123,9 @@ export function exposeDispatchContext(dispatch: DispatchContextRow) {
     id: dispatch.id,
     runId: dispatch.run_id,
     taskId: dispatch.task_id,
+    // Every shipped CLI prints `dispatch.task_id`, and mixed client/host versions are the
+    // normal state, so the rename ships beside the spelling old clients still read.
+    task_id: dispatch.task_id,
     contractVersion: dispatch.contract_version,
     assigneeHandle: dispatch.assignee_handle,
     assigneePaneKey: dispatch.assignee_pane_key,