fix(notifications): do not notify task viewers

[puemos]

Problem

Opening a cloud task starts a technical watcher so the app can show live updates. That watcher stays active across navigation and could also trigger completion or needs-input notifications, even when the viewer did not create the task.

There is no user-facing follow or notification subscription involved.

Changes

Behavior	Before	After
Open another persons task	Starts live updates and could later trigger task notifications	Starts live updates only
Task finishes or needs input	Any client with the technical watcher could notify	Only the task creator is notified
Navigate away from the task	The watcher remains active	Unchanged; live updates continue without granting notification eligibility

The session now records whether the current user created the task. Completion, permission, and spoken notifications check that value before notifying. The live-update watcher itself is unchanged.

How did you test this?

• Added regression coverage proving that a non-author watcher receives updates without completion, permission, or spoken notifications.
• Core notification tests passed.
• Session connection tests passed.
• Core and UI typechecks passed.
• Biome and host-boundary checks passed.

Automatic notifications

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

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Created with PostHog Code

[trunk-io]

😎 Merged successfully - details.

[github-actions]

React Doctor found no issues in the changed files. 🎉

_{Reviewed by React Doctor for commit cf9a51d.}

[posthog]

🦔 ReviewHog reviewed this pull request

Found 1 must fix, 0 should fix, 1 consider.

Published 2 findings (view the review).

[posthog]

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ReviewHog Report

Changes

Issues: 2 issues

Files (4)

• packages/core/src/sessions/sessionFactory.ts
• packages/core/src/sessions/sessionService.ts
• packages/shared/src/sessions.ts
• packages/ui/src/features/sessions/hooks/useSessionConnection.ts