refactor(mobile): adopt shared task runtime

[richardsolomou]

Problem

Mobile still maintains its own task contracts, API transport, policies, and cloud-task stream after the shared equivalents have been extracted.

Depends on #3635
Refs PostHog/posthog#76229

Changes

Phase 2: I migrated mobile task and automation consumers onto the shared contracts, API client, policies, and engine, then removed the replaced mobile implementations. The shared desktop behavior is already established by the preceding PRs, so this review is limited to the mobile migration.

How did you test this?

• Full monorepo typecheck at this checkpoint
• Final stack: 711 shared, 153 API-client, 2,599 core, and 451 mobile tests

Automatic notifications

• Publish to changelog?
• Alert Sales and Marketing teams?

---

Created with PostHog Code

[github-actions]

React Doctor found 1 issue in 1 file · 1 warning.

1 warning

src/features/chat/components/ToolMessage.tsx

• ⚠️ src/features/chat/components/ToolMessage.tsx:662 Independent awaits run sequentially async-parallel

_{Reviewed by React Doctor for commit 4892f7f.}

[richardsolomou]

• feat(mobile): add Codex task parity #3654
• refactor(mobile): finalize portability boundary #3642
• refactor(mobile): adopt shared interaction semantics #3641
• refactor(mobile): finish shared task and inbox adoption #3640
• refactor(mobile): adopt shared task runtime #3637 👈 (View in Graphite)
• refactor(core): extract shared presentation semantics #3635
• refactor(core): extract permission and composer semantics #3634
• refactor(core): extract repository integration semantics #3633
• refactor(core): extract portable cloud task engine #3608
• refactor(core): rename cloud task service as engine #3624
• refactor(core): extract cloud task policies #3623
• refactor(api-client): extract cloud task transport #3622
• refactor(shared): extract task contracts and model policy #3616
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.

[greptile-apps]

Prompt To Fix All With AI

Fix the following 2 code review issues. Work through them one at a time, proposing concise fixes.

---

### Issue 1 of 2
apps/mobile/src/features/tasks/composer/options.ts:62-64
**Recording stop becomes task stop**

When a remote user message starts an agent turn while the local user is recording, `canStop` takes precedence over `isRecording`, so the unchanged stop control cancels the agent turn instead of stopping voice capture, leaving the recording active and potentially losing the user's speech.

### Issue 2 of 2
apps/mobile/src/features/tasks/composer/TaskChatComposer.tsx:500-508
**Unchanged reasoning triggers side effects**

Selecting a model that supports the current reasoning effort still invokes `onReasoningChange`, causing a redundant `set_config_option` cloud command and unnecessary persisted Zustand updates.

_{Reviews (1): Last reviewed commit: "Merge posthog-code/share-mobile-mcp-skil..." | Re-trigger Greptile}

[trunk-io]

😎 Merged directly without going through the merge queue, as the queue was empty and the PR was up to date with the target branch - details.