Implement Report Form Orchestrator Bloc

Use flutter_bloc's Bloc (not Cubit) to enforce explicit event typing. Define a sealed FormEvent hierarchy: FieldChanged(fieldId, value), SaveDraft(), Submit(), Reset(). Define a sealed FormState hierarchy using freezed for immutability and copyWith support. Use a StreamSubscription + Timer for debounce rather than RxDart to minimize dependencies.

Inject repositories via constructor (compatible with both Riverpod and BlocProvider). Guard against concurrent submissions with a submitting flag in state. For cross-field validation, delegate to a pure CrossFieldValidatorService that takes the schema + currentValues and returns a Map. Avoid storing the schema in a local variable inside event handlers — always read from state to keep handlers referentially transparent.

Consider using Equatable on all state/event classes for efficient stream deduplication.

Unit tests using flutter_test and bloc_test package. Test every event→state transition in isolation with mock repositories. Specific scenarios: (1) init with no existing draft emits FormReady with empty values; (2) init with existing draft rehydrates currentValues correctly; (3) FieldChanged debounce fires SaveDraft exactly once after 2s of inactivity; (4) rapid FieldChanged events within 2s do not trigger multiple saves; (5) Submit with missing required fields emits FormReady with validationErrors populated; (6) Submit with valid values emits FormSubmitted and draft is cleared; (7) Reset restores empty schema values; (8) repository failure on draft save emits draftStatus = saveFailed without crashing. Target 95% branch coverage on the bloc class.