推进 UI run summary 文档一致性 guard

wasm-port/docs/ui-run-summary-helpers.md

@@ -37,6 +37,9 @@ vendored LinuxCNC runtime.
 
 `snapshot` is the optional machine session snapshot loaded by the UI. The helper
 reads only snapshot metadata such as `workflow` and `snapshotLabel`.
+When `runtime.snapshotLabel` is present, it is used as the returned
+`snapshotLabel`; otherwise the helper falls back to `snapshot.metadata.snapshotLabel`
+and then `null`.
 
 The returned summary has this shape:
 

wasm-port/tests/ui/node/verify_ini_panel_run_summary.mjs

@@ -57,11 +57,21 @@ assert.deepEqual(
   },
 );
 
-assert.equal(
+assert.deepEqual(
   createRunSummary(program, {
     snapshotLabel: "override-session/override.json",
-  }, snapshot).snapshotLabel,
-  "override-session/override.json",
+  }, snapshot),
+  {
+    runStatus: "ok",
+    programSource: "snapshot",
+    snapshotLabel: "override-session/override.json",
+    workflow: "save-session-snapshot",
+    programOpfsPath: "linuxcnc/gcode/ui-session.ngc",
+    programWasmPath: "/work/ui-session.ngc",
+    iniWasmPath: null,
+    canonicalEventCount: 0,
+    motionSnapshotCount: 0,
+  },
 );
 
 assert.deepEqual(