Name the numeric key value in input refusals

[saworbit]

String keycodes were refused without the integer to send, and the documented Key reflection lookup returned nothing. Both input tools now name the event and the exact pinned enum value in the refusal. Unknown spellings point to the global enum lookup. Refused batches never reach the write or dispatch path.

The pinned reference retains global enums. Existing class records are unchanged. Retry data keeps every event in order and omits batch echoes over 1024 bytes. The schema description, Tool Reference, changelog, test inventory and offline contract snapshot are updated.

Validation: 11 focused native tests and 24 Python tests passed. The new regression fails when the fix is disabled and passes after restoration. Real editor and game probes passed on Godot 4.5.1, 4.6.2 and 4.7.2. They compare project bytes before and after refusal, read persisted numeric retries through Godot and check independent input callbacks. Documentation, inventory and offline snapshot checks passed. Live CI cases cover both keycode fields and verify that rejected batches apply nothing.

Fixes #1415