Clarify hourly conversation naming mechanism and schedule reconciliation

[witbrock]

Merge decision: ready — operators can choose the existing naming consumer and reconcile its hourly schedule without mistaking a task assignment or a create retry for activation.

User outcome

For the bounded job of inspecting an actor's owned unnamed conversations and assigning concise titles hourly, reuse the naming workflow delivered in #645. Recurring task continuation uses the same scheduler plus a Tasks/chat launch; it is useful for evolving responsibilities but adds task, conversation and execution dependencies to this existing consumer.

Material changes

Document that mechanism comparison in the VWL schedule guide. Explain how to reuse an existing schedule, explicitly resume it, and reconcile an older naming consumer before creating a replacement. The schedule creation hash includes the definition identity and inputs, so a stable caller key alone does not prevent duplicate schedules across configuration changes.

Evidence

Inspected the current naming bundle, recurring-task submission path, actor-owned schedule service and durable scheduler. pdm run pytest -q tests/backend/test_conversation_naming_workflow.py tests/backend/test_workflow_schedule_service.py tests/backend/test_task_execution_actions.py tests/backend/test_conversation_search_service.py: 38 passed using a mock database and scripted model responses. This includes due-occurrence creation, deduplication, checkpoint recovery, canonical rename read-back and existing/concurrent-title preservation. Diff whitespace and the new local link/anchor were checked.

Ship boundary

This documentation change records the current implementation and operational reconciliation behaviour. Live actor-scope definition, schedule and occurrence read-back remain outstanding: this worker has no Von control tools and is prohibited from live mutations through shell. No schedule, assignment, conversation name, represented prompt, running service or deployment is changed by this PR. Actual live title quality and hourly execution remain unverified.