Expand WASM sim-config staging coverage

wasm-port/runtime/sdk/README.md

@@ -25,6 +25,7 @@ Use `src/index.js` for stable imports:
 import {
   createLinuxCncIniSdk,
   createLinuxCncInterpSdk,
+  planSimConfigStaging,
 } from "./src/index.js";
 ```
 
@@ -85,6 +86,15 @@ into the Emscripten filesystem, applies executable bits for user M-code files,
 then forwards to `runFileWithIni()` by default or to `runFiveAxisRemapFile()`
 when `executionMode: "fiveAxisRemap"` is explicitly requested.
 
+`planSimConfigStaging()` is the companion file-staging planner for
+representative LinuxCNC `configs/sim` programs. Callers provide the vendored
+source manifest text, machine relative path, INI file name, and INI text. The
+planner reads only INI file references and the manifest, then returns the INI,
+`[DISPLAY]OPEN_FILE`, `[EMCIO]TOOL_TABLE`, `[RS274NGC]PARAMETER_FILE`,
+`[RS274NGC]SUBROUTINE_PATH`, `[RS274NGC]USER_M_PATH`, and remap-NGC files that
+should be copied into the Emscripten filesystem. It does not implement G-code,
+tool, parameter, remap, or user-M semantics.
+
 `runFileWithIniContinueOnError()` uses the same LinuxCNC-backed file execution
 path but keeps the runner loop going after LinuxCNC reports an error, matching
 upstream `rs274 -n 0` regression tests such as `tests/interp/oword-unwind`.