wasm-port: broaden native LinuxCNC interpreter probes

wasm-port/SKILL.md

@@ -9,6 +9,11 @@ LinuxCNC WASM Simulation Port
 This skill guides work inside `wasm-port/` for building a standalone
 LinuxCNC-based CNC simulation program.
 
+The CNC simulation program must be derived primarily from the LinuxCNC source
+program. Work in this port must strictly follow LinuxCNC behavior, structure,
+and semantics, except where a documented standalone runtime boundary requires
+an adapter.
+
 It is intended for tasks involving:
 
 - source extraction from upstream LinuxCNC;
@@ -33,12 +38,15 @@ Use this skill when the work involves any of the following:
 ## Core Principles
 
 1. Upstream LinuxCNC is the semantic source of truth.
-2. The standalone port is a separate program and separate workspace.
-3. Reuse comes before rewrite.
-4. Native runtime dependencies are replaced at the edges, not copied whole.
-5. Machine state and controller-visible behavior are first-class compatibility
+2. The CNC simulation program is primarily sourced from LinuxCNC source code;
+   port-specific code must adapt LinuxCNC to standalone native/WASM execution,
+   not replace LinuxCNC CNC behavior.
+3. The standalone port is a separate program and separate workspace.
+4. Reuse comes before rewrite.
+5. Native runtime dependencies are replaced at the edges, not copied whole.
+6. Machine state and controller-visible behavior are first-class compatibility
    targets, not optional nice-to-haves.
-6. Do not continue building a project-authored CNC program once the porting
+7. Do not continue building a project-authored CNC program once the porting
    harness runs; move behavior back to vendored LinuxCNC source functions.
 
 ## Source Reuse Priorities