GetBlocking unconditionally returned an empty slice behind a TODO, so any
caller asking "which tasks does this task block?" silently got a wrong
answer. The reverse-lookup query the TODO asked for already exists on the
blocker repository as ListTasksBlockedBy (used by the office scheduler and
the handoff context builder) and is already part of the BlockerRepository
interface, so GetBlocking now delegates to it.
Like GetBlockers, it reports the raw blocker edges without filtering
archived tasks — every other ListTasksBlockedBy consumer does the same.
ListTasksBlockedBy also gains a deterministic ORDER BY (mirroring
ListTaskBlockers) and normalizes an empty result to a non-nil slice.
Co-authored-by: Kandev Agent <agent@kandev.dev>
Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>
João Salavisa
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