run jobs on existing tasksets only

[jdchawla29]

Note

Medium Risk
Changes the contract with the backend job/enter endpoint and removes task ID backfilling, which could break taskset linking workflows if callers relied on implicit task creation.

Overview
Associating eval jobs with --taskset now only registers the job against an existing taskset, and no longer attempts to auto-create/link tasks during job registration.

_send_job_enter is simplified to return None and stops sending/expecting task_version_ids; corresponding CLI and run_eval logic that serialized tasks, handled ID assignment, and warned on mismatches is removed. JobEnterPayload drops the tasks field accordingly.

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