Last of the planned moves is the download recording (row 9 in Discussion
#1536). The queue hooks that write a download to the history when it is
queued, finalize it on a terminal status, notify, push the activity
update and reopen a failed request move from `main.py` to
`core/download_recording.py`, registered with
`register_download_recording(...)`.
None of it was tested directly, so the first commit adds 38 tests: the
queued record for direct and request linked downloads, the terminal
snapshot for complete, error and cancelled, ignoring non terminal
statuses, who gets notified, reopening a failed request, and what
happens when a service is missing or a call fails. They pass on current
`main`. The second commit is the move.
`_resolve_status_scope` and the request update emitter stay in `main.py`
because other code uses them, so the emitter is passed in, and the user
database and history service are looked up per call as before. The hooks
are registered at the same spot. Some existing test lines changed with
the move and no assertion did: the `notify_admin`, `notify_user` and
`reopen_failed_request` patches point at the new module, the direct
calls to `_record_download_queued` go through the queue's hook, and two
tests import `QueueStatus` and `viewer_download_id` themselves now that
`main.py` no longer imports them.
The URL map is identical, all 77 rules, and the full suite, ruff and
basedpyright are clean.
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
<!-- coderabbit-ai-generated:v1 -->
## Summary by CodeRabbit
* **Improvements**
* Download history and activity updates reflect queued downloads and
their completion statuses; activity updates are emitted after successful
finalization.
* Admins and eligible download owners receive notifications when
downloads reach a terminal status.
* Requests linked to downloads that fail and cannot be retried are
reopened with a failure reason.
* Activity updates use an opaque download identifier rather than
exposing the underlying task identifier.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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