Module scanner 

Background scanner infrastructure.

Scanners iterate execution partitions at fixed intervals, checking for conditions that require action (expired leases, due delays, index drift). Each scanner type implements the Scanner trait; the ScannerRunner drives them as tokio tasks.

Modules

attempt_timeout

Attempt timeout scanner.

budget_reconciler

Budget counter reconciler.

budget_reset

Budget reset scanner.

cancel_reconciler

Cancel-flow dispatch reconciler.

delayed_promoter

Delayed execution promoter scanner.

dependency_reconciler

Dependency resolution reconciler.

edge_cancel_dispatcher

RFC-016 Stage C — sibling-cancel dispatcher.

edge_cancel_reconciler

RFC-016 Stage D — sibling-cancel reconciler (Invariant Q6 safety net).

execution_deadline

Execution deadline scanner.

flow_projector

Flow summary projector scanner.

index_reconciler

Index consistency reconciler.

lease_expiry

Lease expiry scanner.

pending_wp_expiry

Pending waitpoint expiry scanner.

quota_reconciler

Quota concurrency reconciler.

retention_trimmer

Terminal execution retention scanner.

suspension_timeout

Suspension timeout scanner.

unblock

Unblock scanner for budget/quota/capability-blocked executions.

Structs

FailureTracker

Tracks persistently-failing items so they don’t permanently consume batch slots. After [FAILURE_THRESHOLD] consecutive failures for the same key, the item is skipped for [BACKOFF_CYCLES] scan cycles.

ScanResult

Result of scanning one partition.

ScannerRunner

Drives a scanner across all execution partitions in a loop.

Traits

Scanner

Trait for background partition scanners.

Functions

should_skip_candidate

Issue #122: per-candidate filter helper shared by all execution-shaped scanners.