- Add TraceEvent::Exception and Opcode variants with profile filtering
- Extract dispatch_traced_frame helper for Call/Return trace events
- Fire exception trace on new raises, SEND StopIteration, FOR_ITER StopIteration
- Fire opcode trace events gated by f_trace_opcodes
- Move prev_line to FrameState for persistence across generator suspend/resume
- Reset prev_line in gen_throw for correct LINE monitoring after yield
- Add per-code event mask (events_for_code) to prevent unrelated code instrumentation
- Remove expectedFailure markers from test_bdb (5) and test_sys_setprofile (14)