chore: sweep Kimi mentions from comments and notes

tests/helpers.cjs

@@ -70,7 +70,7 @@ function builtLib() {
 //   MSD_WORKSTREAM   — planningDir() workstream segment (src/planning-workspace.cts)
 //
 // #2665 round 3: this list shrinks as sources become enumerable, and that direction
-// is the point. KIMI_SHARE_DIR was NOT added here — it now derives from
+// is the point. Descriptor-resolved vars were NOT added here — they now derive from
 // NON_REGISTRY_CONFIG_HOME_DESCRIPTORS, because hand-adding each var a reviewer
 // names is precisely what reopened this bug three times.
 const NON_REGISTRY_CONFIG_LOCATION_ENV_KEYS = [
@@ -133,8 +133,8 @@ function configLocationEnvKeys() {
     ...Object.values(runtimes).flatMap(
       (r) => r?.runtime?.configHome?.skillsHome?.env ?? [],
     ),
-    // 2. Descriptor-shaped config homes resolved OUTSIDE the registry (kimi's
-    //    native config.toml home via KIMI_SHARE_DIR). Derived, not hand-listed.
+    // 2. Descriptor-shaped config homes resolved OUTSIDE the registry (a host's
+    //    native config.toml home). Derived, not hand-listed.
     //    Same skillsHome walk as rung 1 — a descriptor is a descriptor.
     ...NON_REGISTRY_CONFIG_HOME_DESCRIPTORS.flatMap((d) => [
       ...(d?.env ?? []),