转向直接移植LinuxCNC源程序

结论：明确禁止继续扩展自写 CNC 主体语义，最小 runtime 仅保留为迁移探针；新增 interp_convert.cc 源码直连编译探针，并以最小 emcStatus 状态边界 shim 暴露 native runtime 阻塞点。检查：git diff --check 通过；wasm-port/tests/native/verify_native_probes.sh 通过，linuxcnc_interp_convert_source_probe exitcode=0。

wasm-port/AGENTS.md

@@ -19,6 +19,17 @@ Build a standalone CNC simulation system that:
 - does not drive real hardware;
 - preserves LinuxCNC software behavior as closely as practical.
 
+## Current Direction
+
+The migration target is the LinuxCNC source program itself, adapted to run as
+the standalone WASM simulation program. The project must not evolve a
+project-authored interpreter, planner, or CNC semantics layer now that the
+porting harness is running.
+
+Existing minimal runtime wrappers are migration probes only. They are allowed
+to expose, compile, and validate vendored LinuxCNC code, but they must not be
+expanded into a separate implementation of G-code behavior.
+
 ## Repository Boundaries
 
 1. `../linuxcnc/` is upstream and must be treated as read-only input for the
@@ -33,21 +44,24 @@ Build a standalone CNC simulation system that:
 ## Engineering Rules
 
 1. Reuse LinuxCNC source before reimplementing any CNC logic.
-2. Prefer wrappers, shims, and extraction scripts over invasive source edits.
-3. Preserve LinuxCNC semantics for:
+2. Do not add new project-authored CNC semantics when LinuxCNC source exists.
+   Replace temporary wrapper behavior with direct calls into vendored LinuxCNC
+   source, or with the narrowest shims needed to make those calls compile.
+3. Prefer wrappers, shims, and extraction scripts over invasive source edits.
+4. Preserve LinuxCNC semantics for:
    - G-code execution;
    - modal state;
    - parameter and variable behavior;
    - kinematics;
    - planner behavior;
    - machine and controller state visible to software.
-4. Replace only the native runtime edges:
+5. Replace only the native runtime edges:
    - file IO;
    - process model;
    - HAL runtime;
    - IPC;
    - GUI.
-5. Frontend code must be implemented with web technology, not migrated from
+6. Frontend code must be implemented with web technology, not migrated from
    native GUI code.
 
 ## Required Layout