Re-lands #2337 directly on current main after its temporary base branch
was merged and deleted.\n\n- excludes userPaused tasks from scheduler
and remembered-owner selection\n- includes userPaused in candidacy
fingerprints and unpause scheduling\n- keeps normal unpaused dispatch
behavior\n- includes regressions and a release changeset\n\nValidation
on current main: scheduler suites 50/50, @fusion/core typecheck, and
@fusion/engine typecheck passed. The PostgreSQL routing file was
discovered but skipped without a configured test database.
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Bug Fixes**
* Manually parked/paused tasks are no longer selected or dispatched
while they remain paused.
* A task only re-enters dispatch flow after it is explicitly unpaused.
* Unpausing a task promptly refreshes scheduling and makes it eligible
for dispatch.
* Scheduler state updates now correctly react to pause status changes
(including when pause is represented via `userPaused`).
* **Tests**
* Expanded scheduler and routing regression coverage for pause/unpause
and dispatch invalidation behavior.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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Co-authored-by: v <v@v.speedport.ip>
Co-authored-by: gsxdsm <gsxdsm@users.noreply.github.com>
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