Module dispatch 

Resource-aware indexing scheduler (RFC-036 §5–§16).

The Scheduler is the single entry point for all background indexing work. It:

• routes jobs into typed bounded queues;
• enforces backpressure when queues are full;
• tracks resource mode (Normal / UserActive / Paused);
• dispatches one job per tick() call, skipping embedding in UserActive mode (RFC-036 §9.2);
• emits SchedulerEvents the app layer uses to update the UI;
• persists job state to the catalog for crash recovery (RFC-036 §16).

Execution model: synchronous, single-threaded. This matches the existing run_pending model and the snora/iced GUI thread contract. Async dispatch can be layered on top in a future RFC.

Structs

Scheduler

The resource-aware scheduler (RFC-036 §5–§16).