docs: align runner docs with current API

docs/developing.md

@@ -90,7 +90,7 @@ The orchestrator module containing:
 - Per-resume locks (WeakValueDictionary) prevent concurrent resumes of the same session
 - Event delivery uses a single internal queue to preserve order without per-event tasks
 - Stderr is drained into a bounded tail (debug logging only)
-- Event callbacks must not raise; callback errors abort the run
+- Translation errors abort the run; keep event normalization defensive
 
 ### `model.py` / `runner.py` - Core domain types
 

docs/runner/codex/codex-takopi-events.md

@@ -69,7 +69,7 @@ From the bridge/runner point of view:
 
 1. **Bridge receives Telegram prompt**
 2. Bridge tries to extract a resume line (`codex resume <uuid>`) from the message/reply (runner-owned parsing). 
-3. Bridge calls `runner.run(prompt, resumeTokenOrNone, on_event=...)`
+3. Bridge calls `runner.run(prompt, resumeTokenOrNone)`
 4. Codex runner spawns `codex exec --json ...` and reads JSONL line-by-line. 
 5. The *first moment the runner can know thread identity* is:
 
@@ -350,7 +350,7 @@ did_emit_started = False
 did_emit_completed = False
 turn_index = 0
 
-def emit(evt): on_event(evt)
+def emit(evt): yield evt  # emit to the output event stream
 
 for line in codex_jsonl_stream:
     t = line["type"]