fix: address review serialization and url encoding

feat: surface generic recommendation items in API and UI

fix: persist recommendation result when task hands a result model (feedback 400).

dev: Let chat become a 1s pooling streaming

dev: User role-gated Debug page access

fix: persist preferences in user profile

frontend: Display message and input style

test: Update contract and other tests

dev:frontend: Page allowance for user message editing

test: frontend contract generation

Frontend testing initiated