Complexity refactoring: review handoff

Objective and state

All six requested refactors are implemented and locally verified, ready for review. Public commerce behavior is preserved; bounded group-counter flushing is tightened. The specifications were synthesized with the requested to-spec skill and published to the Recommendations Linear project with ready-for-agent, in In Review.

Specification	Responsibility introduced	Review issue
Serving	Application service, candidate strategies, typed outcomes	PL-236
Configuration	Strict section-owned factories	PL-237
Group reduction	Typed adapters, accumulator, bounded buffers	PL-238
Swimlane resolution	Compiled step strategies	PL-239
Checkpoints	Explicit lifecycle operations and no-op lifecycle	PL-240
Training evidence	Typed partition builders and provider factory	PL-241

Working tree

Original baseline: 7d2dd25. The implementation was committed externally during the session as f7e9afa and a1b544d; the agent did not create or rewrite those commits. The final test-line formatting correction and this handoff were made afterward. Documentation describes the new ownership. Wheel verification regenerated the package source manifest to include the new serving and group modules, and local .build artifacts.

Evidence

Verification commands run during implementation (repeated runs grouped):

Command	Result
make test-static	Passed; intermediate lint/import/docstring errors corrected
make test-focused TEST=tests/unit/test_config.py	51 passed
make test-focused TEST=tests/unit/test_workstore.py	51 passed
make test-focused TEST=tests/unit/test_group_accumulator.py	5 passed
make test-focused TEST=tests/unit/test_serving.py	13 passed
make test-focused TEST=tests/unit/test_training_evidence.py	2 passed
make test-focused TEST=tests/unit/test_simulation_checkpoint.py	16 passed
make test-focused TEST=tests/unit/test_swimlane_service.py	6 passed
make test-focused TEST=tests/contract/test_api.py	16 passed
make test-focused TEST=tests/integration/test_end_to_end.py	14 passed
make verify	Passed: static, 484 unit tests, contract/delivery, non-PostgreSQL integration, wheel build and isolated installed-wheel smoke
git diff --check	Passed

A combined two-file TEST argument was rejected because the Make target treats it as one path; both focused files were then run separately and passed. The final wider run initially caught an overlong new test line; it was corrected before the passing run. SQLite datetime deprecation and optional ANE dispatch-floor warnings remain non-fatal.

A read-only Python comparison against pinned baseline 7d2dd25 verified unchanged configuration fingerprints for four representative payloads (defaults, pipeline settings, source configuration, and quality drift). AST inspection confirmed these orchestration spans, including docstrings, without claiming a whole-code cognitive-complexity score:

Entry point	Before	After
Deployment loader	517	20
Ordinary / personalized HTTP serving	196 / 205	66 / 69
Group consumption	160	31
Evidence derivation / provider assembly	318 / 193	55 / 28
Checkpoint execution	165	59
Swimlane resolution	113	65

PostgreSQL-only checks were not run: no explicitly disposable TEST_CONTROL_DATABASE_URL was supplied. No migration or Docker/Compose artifact changed, so separate migration/Compose gates were not required. Hosted CI was not run by the agent.

Decisions and risk

Composition replaces repeated variant dispatch and separates state ownership. Explicit validation, isolation, and failure guards remain; minimizing an arbitrary if count was not the acceptance criterion. Tests assert observable behavior through existing contracts and direct service/accumulator seams proposed to the user. No new dependency or public API is introduced. Existing For You snapshot-read behavior is preserved, not redesigned.

Authority

The requested skill authorized specification publication to the issue tracker. No deployment, package publication, hosted-setting change, or merchant-data mutation was performed. No implementation work remains for these six specifications; human review remains.