mafredri added a commit that referenced this pull request

Previously, tasks with pending provisioner jobs (not yet picked up)
were incorrectly reported as "initializing".

Refs #21887

Base automatically changed from mafredri/fix-task-pending-status to main

Previously we returned 400 Bad Request for all non-active states. This was
semantically incorrect for transitional and paused states where the request
is valid but conflicts with current state.

We now return 409 Conflict for pending/initializing/paused (resolvable by
waiting or resuming) and 400 for error/unknown (actual problems). This
enables client-side auto-resume orchestration per the task lifecycle RFC.

Closes coder/internal#1265