feat(BA-6581): wire IdleCheckerRepository into idle-check reconciler source

[seedspirit]

Summary

• Add IdleCheckerRepository (with its DB source and result types) that fetches a normalized IdleCheckSnapshot of sessions, their applicable scopes, scope→checker bindings, and typed checker specs.
• Wire the repository through the orchestration DI (composer/sokovan input) and the reconciler stage factory so IdleCheckSource fetches real data instead of returning a placeholder.
• Make IdleCheckerSpecABC.load dispatch by checker_type to concrete SessionLifetimeSpec / NetworkTimeoutSpec / UtilizationSpec specs (fields land with the checker-logic stories).
• Add ScopeType, ScopeRef, and IdleCheckSessionView data types.

Test plan

• pants test on changed targets (test_source, test_stage, test_sokovan, test_composer) — passing locally via pre-push hook
• CI green

Resolves BA-6581

[Copilot]

Pull request overview

This PR replaces the placeholder idle-check reconciler source with a real data path. It introduces an IdleCheckerRepository (backed by a new IdleCheckerDBSource) that fetches a normalized IdleCheckSnapshot — sessions, their applicable scopes (resource group / project / domain), scope→checker bindings, and typed checker specs — and wires this repository through the orchestration DI and the reconciler stage factory so IdleCheckSource.fetch_reconcile_info returns the snapshot instead of an empty placeholder. It also makes IdleCheckerSpecABC.load dispatch by checker_type into concrete (currently field-less) spec classes that land their fields in follow-up stories. The change is read-only; the handler/applier remain placeholders.

Changes:

• New idle_checker repository layer (repository, repositories, db_source, result types) producing IdleCheckSnapshot, plus new ScopeType/ScopeRef/IdleCheckSessionView data types.
• DI wiring of idle_checker_repository through Repositories, both orchestration composers, sokovan input, and the reconciler stage factory, with IdleCheckReconcileInfo switched from session_ids to snapshot.
• IdleCheckerSpecABC.load now dispatches on checker_type to SessionLifetimeSpec / NetworkTimeoutSpec / UtilizationSpec.

Reviewed changes

Copilot reviewed 19 out of 21 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
repositories/idle_checker/db_source/db_source.py	New DB reads assembling the normalized snapshot (joins + correlated enabled-binding filter).
repositories/idle_checker/repository.py	Thin repository delegating to the db_source.
repositories/idle_checker/repositories.py	IdleCheckerRepositories container following the per-entity wrapper convention.
repositories/idle_checker/types.py	IdleCheckerRef, IdleCheckerBindingRef, IdleCheckSnapshot result types.
repositories/repositories.py	Registers idle_checker in the aggregate Repositories.
data/idle_checker/types.py	Adds ScopeType, ScopeRef, IdleCheckSessionView.
models/idle_checker/spec.py	load discriminated dispatch + concrete spec subclasses.
sokovan/idle_check/source.py	Injects repository; fetches real snapshot.
sokovan/idle_check/types.py	IdleCheckReconcileInfo carries snapshot; entity_ids derives from it.
sokovan/stages/idle_check.py	build_idle_check_stage now takes the repository.
sokovan/stages/factory.py	Threads idle_checker_repository into stage assembly.
dependencies/orchestration/composer.py, dependencies/orchestration/sokovan.py, dependencies/composer.py	DI plumbing of the new repository.
tests/.../idle_check/test_source.py, test_stage.py, dependencies/orchestration/test_sokovan.py, test_composer.py	Update/add tests for the new repository argument and source behavior.
changes/12398.feature.md	Changelog entry.

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