Contract tests

The contract suite keeps adapter behavior aligned with the shared lifecycle:

• registryDerivation.test.ts defends derived capability registry membership and ordering.
• adapterPathContract.test.ts defends generated-source/path agreement.
• Adapter-specific hook tests defend target reload, pointer, package, and environment behavior.
• selectApply.test.ts defends sequential application and partial-failure persistence.
• themeGenerator.test.ts covers shared generation/application behavior.
• atomicWrite.test.ts defends same-directory atomic-write and copy invariants.

New adapters should add tests for every overridden capability, path, gate, extra file, or hook—not only snapshot their output.