chore: remove unused TaskState weak-ref fields for create-batch and cascade-batch-state

[detail-app]

Removed the dead TaskState::create_batch_job and TaskState::cascade_batch_state_job
weak-ref fields, their get_create_batch_job/get_cascade_batch_state_job getters,
the OnceLock::set writes in TaskRunner::new, and the corresponding initializers
across all TaskState { ... } construction sites (1 production + 6 test sites).

These weak-ref fields and getters had no production or test consumers. Production
enqueue paths reach into the strong Arc<Job> fields on TaskRunner directly
(state.task_runner.create_batch_job.enqueue(...) and
state.task_runner.cascade_batch_state_job), bypassing the weak-ref accessors
entirely. The cross-job enqueue pattern described in their doc comments was never
wired up.

This is a connected dead cluster: each field was read only by its getter, and each
getter had zero call-sites anywhere in the codebase.

History

• Last materially changed April 2026 (feat: cascade batch state to child requests via background job #1001 @pjb157)

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