[Kanti]

Implements #16: extensions can register attribute-configured controls without changing the inspector for each new input. Providers receive the original argument and transformer-input context; explicit parameter attributes, deterministic exact/wildcard selection, trusted Fluid templates and import-map modules compose with existing transformers.

The adapter lifecycle awaits asynchronous startup before snapshots and writes, supports dirty tracking, validation, Reset, preview values and save/copy, and destroys late mounts after navigation. Includes an extension-owned example with a nested transformer input and registration documentation. This is the base of the planned #12 → #15 → #38 stack; no dependency PR.

Validation: PHP 8.5 unit 331 tests/1332 assertions; SQLite functional 87 tests/501 assertions; GrumPHP all 12 tasks including PHPStan, Rector, lint and Composer audit; Node 95 tests; TypeScript check. Chromium exercised delayed mounting, dirty state, nested values, preview URL, Reset, validation, Save/copy request payloads and teardown. Browser transport/document/notification services were mocked; authenticated TYPO3 browser and MySQL/PostgreSQL flows were not exercised. Screenshot and browser evidence are in the task workspace (/workspace/issue16-control.png, /workspace/issue16-browser.log), not remotely hosted.

API scope: matching uses normalized exact types then wildcard providers with context predicates, rather than implicit class-subtype matching. This makes matching explicit for union-specific controls.

Rebase validation (2026-10-07)

Rebased onto current main. Includes the equivalent null-safe variant-copy rewrite required by current Rector.

Local PHP 8.5 unit: 346 tests/1534 assertions; MySQL functional: 95 tests/558 assertions; Node/Chromium: 118 tests; TypeScript and all GrumPHP tasks passed.

Current-head CI: all 8 jobs passed for 1711cb1.

Nullable custom adapters use the same data-fixture-value-null state as native inputs. An initially empty adapter value represents null while that flag is set; editing to a value clears it, and Reset restores the saved null flag before updating the adapter. Clearing an edited value remains an empty string. A regression covers mounting, collection, editing and Reset.

Stack rebased onto current main: #42 → #46 → #48. Current-head CI: all 8 jobs passed for d59fec6.

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