fix: try/finally 支持 break/continue/return 穿越 finally（completion 机制）

crates/oxide_cfg/src/lib.rs

@@ -71,6 +71,8 @@ fn is_terminator(op: OpCode) -> bool {
     matches!(
         op,
         OpCode::JMP
+            | OpCode::BREAK
+            | OpCode::CONTINUE
             | OpCode::JMP_IF_TRUE
             | OpCode::JMP_IF_FALSE
             | OpCode::JMP_IF_NULLISH

crates/oxide_cfg/src/partition.rs

@@ -25,7 +25,7 @@ pub(super) fn partition_blocks(f: &IRFunction) -> Vec<bool> {
         // 跳转的 fallthrough 后继是块头：条件跳转否则 cond+then 融块、条件边丢失；
         // 无条件 JMP 同样必须切块头——JMP 不 fallthrough，但其后继位置需成块边界，
         // 否则 JMP 与后续指令融块、块尾判定错、Jump 边丢失（DCE 可达性误删目标块）。
-        if matches!(inst.op, OpCode::JMP | OpCode::JMP_IF_TRUE | OpCode::JMP_IF_FALSE | OpCode::JMP_IF_NULLISH) {
+        if matches!(inst.op, OpCode::JMP | OpCode::BREAK | OpCode::CONTINUE | OpCode::JMP_IF_TRUE | OpCode::JMP_IF_FALSE | OpCode::JMP_IF_NULLISH) {
             heads[i + 1] = true;
         }
     }

crates/oxide_cfg/src/split.rs

@@ -37,7 +37,7 @@ pub(super) fn split_and_edges(f: &IRFunction, heads: &[bool]) -> (Vec<BasicBlock
             continue;
         }
         match last.op {
-            OpCode::JMP => {
+            OpCode::JMP | OpCode::BREAK | OpCode::CONTINUE => {
                 if let Operand::Label(l) = last.b {
                     match f.label_pos.get(l as usize).and_then(|p| *p) {
                         Some(p) => {