feat(mobile): suppress only the on-screen thread's alert on Android

[juliusmarminge]

Stacked on #12051. Android suppressed every agent alert while the app was foregrounded. It now suppresses only alerts for the thread on screen, matching iOS.

The navigation hook synchronously reports the visible thread to the Kotlin FCM handler in a layout effect. The native route is kept in memory so a restarted process cannot inherit a stale route. Grouped alerts target the overview, so viewing one thread cannot silence alerts for the other threads in the group.

Validation: mobile, web and desktop typechecks pass, along with 46 focused mobile tests and 55 relay tests. CI passes on 06dcb14514e, including Check, Test and all three server shards. React Doctor reports no errors.

Release previews include the Expo 58 stack through this PR with Screens 4.28.0. The Screens v5 and Duo layers are excluded.

• iOS preview, finished: built from 11e75b148bb, with the synchronous route fix published to its matching runtime on the preview EAS Update channel. Relaunch after downloading the update to apply it.
• Android preview, finished: successfully built from 06dcb14514e. The first Release build exposed a missing Kotlin annotation during R8 shrinking. The SDK layer now suppresses that specific warning; generated ProGuard rules were checked locally, and the cloud Release retry passed with shrinking enabled.

Both use the internal Release preview profile. The maintainer reports the preview works and has authorized merging the Expo 58 stack. The relay change takes effect with the production relay deployment after merge. The Android widget cold-start limitation remains documented in #12046.

Landing validation: mobile and relay typechecks pass, along with 49 focused JavaScript tests and 120 Android native test cases. The native cases cover widget reboot recovery on API 24/36 and notifications on API 24/26/33/36. SwiftLint, ktlint and detekt pass; React Doctor reports no errors. Narrow review fixes were applied in the owning layers before landing.

Prepared with GPT-6.1 Sol in the Codex harness.

[github-actions]

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

ℹ️ No successful main baseline artifact is available yet. This run establishes the initial measurement.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	—	13.5 KiB	—	15.1 KiB	✅
Codex	Thread snapshot wire	—	7.1 KiB	—	7.3 KiB	✅
Codex	Live turn WebSocket wire	—	6.5 KiB	—	7.8 KiB	✅
Codex	Live turn WebSocket decoded	—	56.3 KiB	—	66.4 KiB	✅
Codex	Live turn messages	—	10	—	21	✅
Claude	Total thread wire	—	13.5 KiB	—	15.1 KiB	✅
Claude	Thread snapshot wire	—	7.1 KiB	—	7.3 KiB	✅
Claude	Live turn WebSocket wire	—	6.4 KiB	—	7.8 KiB	✅
Claude	Live turn WebSocket decoded	—	57.0 KiB	—	66.4 KiB	✅
Claude	Live turn messages	—	9	—	21	✅

Baseline: unavailable · PR result: 82db0c5 · Source CI: success

Scenario and decoded snapshot size

10 historical turns, 5 command tools per turn, 878.9 KiB retained MCP result per historical turn, and a 1.05 MiB retained result in the measured turn.

• Codex decoded thread snapshot: 114.0 KiB
• Claude decoded thread snapshot: 114.7 KiB

Updated in place by a trusted workflow. PR artifacts are strictly validated and never executed.

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📝 Walkthrough

Walkthrough

Foreground Android alerts are suppressed only when the app is resumed and the alert path matches the visible thread. Mobile navigation sends the current pathname to the native module. Alerts for other threads remain visible.

Changes

Thread-specific Android alert suppression

Layer / File(s)	Summary
Native thread tracking and suppression apps/mobile/modules/t3-agent-notifications/android/src/main/java/..., apps/mobile/modules/t3-agent-notifications/android/src/test/..., docs/operations/android-notifications.md	Android stores the visible thread route. Matching foreground alerts are suppressed. Alerts for other threads are posted and recorded as seen. Tests cover alerts for other threads. The documentation describes thread-specific foreground suppression.
Navigation synchronization apps/mobile/src/features/agent-awareness/...	Mobile navigation updates its route reference in a layout effect and forwards the current pathname to Android.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix

Sequence Diagram(s)

sequenceDiagram
  participant NotificationNavigation
  participant AndroidNotifications
  participant T3AgentNotificationsModule
  participant AgentNotifications
  NotificationNavigation->>AndroidNotifications: pathname changes
  AndroidNotifications->>T3AgentNotificationsModule: setThreadOnScreen(path)
  T3AgentNotificationsModule->>AgentNotifications: forward visible thread route

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Merge Risk: 🔵 Low · up to 7e998

A narrow navigation-transition race can hide an alert for a thread that is no longer on screen. This is a localized notification risk rather than a broad app failure.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 7.14% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 14 functions across 5 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly and concisely describes the main change: Android now suppresses alerts only for the thread currently on screen.
Description check	✅ Passed	The description explains the problem, the cross-component implementation, the verification results, and the release previews. It also identifies the stacked pull request and maintainer authorization, …

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Inline comments:
In
`@apps/mobile/modules/t3-agent-notifications/android/src/main/java/expo/modules/t3agentnotifications/AgentNotifications.kt`:
- Around line 93-94: Replace the SharedPreferences persistence of threadOnScreen
in the route update flow with process-memory state that has safe visibility
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threadOnScreen to use this in-memory value, ensuring a new process starts with
no previous on-screen route.

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• apps/mobile/src/features/agent-awareness/notificationNavigation.ts
• docs/operations/android-notifications.md

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[macroscopeapp]

Approvability

Verdict: Not approved

Macroscope's review found this PR not approvable — This changes the default Android notification experience across native FCM handling, navigation state, and relay payload routing: other-thread alerts now surface while foregrounded and grouped alerts target the overview. The cross-layer production behavior change warrants human review despite focused test coverage.

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• Diff unchanged. Approvability was decided on eligibility alone.

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Inline comments:
In
`@apps/mobile/modules/t3-agent-notifications/android/src/main/java/expo/modules/t3agentnotifications/AgentNotifications.kt`:
- Line 149: Update the onScreen calculation in the notification handler to read
the visible thread route into a local value and require it to be non-null before
comparing it with data["alert_path"]. Preserve suppression only for resumed apps
with a matching visible thread, and add coverage for a resumed app with no
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• apps/mobile/src/features/agent-awareness/notificationNavigation.ts
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Review comments at
@apps/mobile/src/features/agent-awareness/notificationNavigation.ts:
- Around line 13-26: Update the layout effect in the hook to derive the current
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