Introduce a typed application boundary for provider execution (#1045)

Move protocol models to their protocol owners (#1044)

Restore protocol-correct provider errors without client retry loops (#1033)

Move runtime packages under src namespace (#1029)

Preserve messaging transcript on stop

Remove legacy future annotation imports (#982)

Fix stream:false requests returning malformed response (matches #917, #868, #771, #497 symptom) (#977)

Split API request handling by product surface (#923)

Refactor provider stream engine (#883)

Refactor API request pipeline (#851)

feat(logging): structured TRACE events and end-to-end request correlation

Major refactor: API, providers, messaging, and Anthropic protocol