Direct factory injection is now the default mocking pattern (Plan 8).
Container rebinding is reserved for router-level tests.
rebindRepository helpers removed — use cases and controllers are factory
functions; tests construct mocks and pass them in.
New 'Test obligations per layer (Plan 9)' table maps each layer to its
required test types: R10 (controller input), R25 (use-case output
validation), R26 (router error mapping), R27/R28 (presenter view shape).
Refactor log doc-update checklist: testing-strategy.md ticked.