parallel_search_sources accepted an overall_timeout but never honoured it.
The ThreadPoolExecutor ran inside a `with ... as pool` block, whose __exit__
calls shutdown(wait=True); even after as_completed() raised TimeoutError on
schedule, leaving the block blocked the caller until every worker finished.
A single slow source (e.g. ClawHub) therefore stalled the entire browse for
minutes. Manage the executor manually and shut it down with
wait=False, cancel_futures=True in a finally, so the timeout actually returns
and not-yet-started work is dropped.
ClawHubSource._load_catalog_index walked up to 750 sequential pages with no
wall-clock bound (each request under its own timeout=30, so nothing errored),
and wrote the result to the index cache unconditionally — so an interrupted or
slow walk poisoned the cache with a partial catalog. Add a
CATALOG_WALK_BUDGET_SECONDS deadline that breaks the walk early, and only write
the cache when the walk reaches a natural stop (cursor exhausted or page cap),
never on a budget-truncated walk.
Adds regression tests covering both bugs (timeout honoured + slow source
flagged; budget abort does not poison cache) plus their happy-path invariants.
briandevans
105625d650