feat(trace): scriptable on_frame callback + quiet mode + SimSession entries

SniffSession/SimSession.start_15693 gain on_frame(frame) and quiet kwargs (defaults preserve today's print behavior). Each frame is a plain dict {protocol, direction, timestamp, duration, data, data_hex, decoded[, crc_fail]} with no ANSI. SimSession now accumulates frames (entries property + clear(), mirroring SniffSession) and auto-streams when trace or on_frame is set; printing is gated on trace and not quiet. TraceFormatter.decode() exposes the annotation without color; format()/print() untouched.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

tests/test_sim_trace_fmt.py

@@ -561,6 +561,7 @@ class TestSimSessionTraceWiring:
         session = SimSession()
         session._formatter = mock_fmt
         session._active = True
+        session._print_frames = True   # start_15693(trace=True) sets this
 
         frame = self._make_trace_frame(0, bytes([0x26, 0x01, 0x00]))
         mock_serial = MagicMock()