In-app notifications for child agents

[danielpeng2]

Description

Child agents (local and cloud) currently never trigger in-app notifications because AgentNotificationsModel filters them out early via should_exclude_from_navigation(). This PR allows child agent conversations through the notification pipeline so users get toast/mailbox notifications when a child agent completes, fails, or needs attention.

Clicking a child notification navigates to the child's pane if it's been revealed, otherwise to the parent's pane. Gated behind the existing FeatureFlag::HOANotifications.

Oz conversation · Plan

Linked Issue

• The linked issue is labeled ready-to-spec or ready-to-implement.
• Where appropriate, screenshots or a short video of the implementation are included below (especially for user-visible or UI changes).

Testing

• Manual testing: spawn local and remote child agents and verify notifications appear.

https://www.loom.com/share/7bf1a8fe8e624b4c8551880b1ea7043f

Agent Mode

• Warp Agent Mode - This PR was created via Warp's AI Agent Mode

Co-Authored-By: Oz oz-agent@warp.dev

[danielpeng2]

• Desktop notifications for child agents #10136
• In-app notifications for child agents #10111 👈 (View in Graphite)
• master

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[oz-for-oss]

@danielpeng2

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[oz-for-oss]

Overview

This PR routes child agent conversations through the HOA notification mailbox/toast pipeline and resolves navigation to either the child pane or parent pane.

Concerns

• Child conversations now bypass should_exclude_from_navigation() before checking FeatureFlag::HOANotifications, so with the flag disabled they can fall into the legacy notification path instead of preserving the previous behavior.

Verdict

Found: 0 critical, 1 important, 0 suggestions

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[oz-for-oss]

⚠️ [IMPORTANT] This bypass runs before the HOA feature-flag branch, so child conversations can now trigger the legacy notification path when HOANotifications is disabled. Keep the child-agent exception behind the same flag so disabling HOA notifications preserves the old filtering behavior.

Suggested change

	if updated_conversation.should_exclude_from_navigation()
	&& !updated_conversation.is_child_agent_conversation()
	{
	if updated_conversation.should_exclude_from_navigation()
	&& !(FeatureFlag::HOANotifications.is_enabled()
	&& updated_conversation.is_child_agent_conversation())
	{