feat: add Python 3.11/3.12/3.13 support to shared structs

- Add none_struct_addr field to PythonUnwindInfo for Python 3.13+
  _Py_NoneStruct sentinel frame detection
- Add py_version and py_none_struct_addr fields to unwind_state_t
  for version-conditional BPF logic

Author: kylewanginchina

agent/crates/trace-utils/src/lib.rs

@@ -148,6 +148,7 @@ pub struct PythonUnwindInfo {
     pub tsd_info: TsdInfo,
     pub offsets_id: u8,
     pub _padding: [u8; 5],
+    pub none_struct_addr: u64, // _Py_NoneStruct address for Python 3.13+, 0 otherwise
 }
 
 #[cfg(feature = "enterprise")]

agent/crates/trace-utils/src/trace_utils.h

@@ -195,7 +195,8 @@ typedef struct {
     uint16_t version;
     tsd_info_t tsd_info;
     uint8_t offsets_id;
-    uint8_t padding[5];
+    uint8_t _padding[5];
+    uint64_t none_struct_addr;
 } python_unwind_info_t;
 #endif
 

agent/src/ebpf/kernel/perf_profiler.bpf.c

@@ -160,6 +160,8 @@ typedef struct {
 
 	void *py_frame_ptr;
 	__u8 py_offsets_id;
+	__u16 py_version;            // Python version encoded as 0xMMmm (e.g. 3.11 -> 0x030B)
+	__u64 py_none_struct_addr;   // _Py_NoneStruct address (0 if < 3.13)
 
 	void *lua_L_ptr;
 	__u8  lua_is_jit;       // 0: Lua 5.x, 1: LuaJIT
@@ -206,6 +208,8 @@ void reset_unwind_state(unwind_state_t * state)
 
 	state->py_frame_ptr = NULL;
 	state->py_offsets_id = 0;
+	state->py_version = 0;
+	state->py_none_struct_addr = 0;
 	state->luajit_frame = NULL;
 	state->luajit_bot = NULL;
 	state->luajit_skip_depth = 0;