test(3663): add export check for stageSkillsForRuntimeAsSkills

RED-1/GREEN-1: export assertion + stub function + STAGED_DIRS export.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

get-shit-done/bin/lib/install-profiles.cjs

@@ -373,6 +373,10 @@ function stageAgentsForProfile(srcAgentsDir, resolvedProfile) {
   return stageDir;
 }
 
+function stageSkillsForRuntimeAsSkills(srcCommandsDir, resolvedProfile, converter, prefix) {
+  // stub
+}
+
 // ---------------------------------------------------------------------------
 // Profile marker persistence
 // ---------------------------------------------------------------------------
@@ -560,6 +564,8 @@ module.exports = {
   mostRestrictiveProfile,
   stageSkillsForProfile,
   stageAgentsForProfile,
+  stageSkillsForRuntimeAsSkills,
+  STAGED_DIRS,
   readActiveProfile,
   writeActiveProfile,
   // Shared internals

tests/install-profiles-stage.test.cjs

@@ -12,9 +12,11 @@ const os = require('os');
 const {
   stageSkillsForProfile,
   stageAgentsForProfile,
+  stageSkillsForRuntimeAsSkills,
   cleanupStagedSkills,
   resolveProfile,
   loadSkillsManifest,
+  STAGED_DIRS,
 } = require('../get-shit-done/bin/lib/install-profiles.cjs');
 
 const REAL_COMMANDS_DIR = path.join(__dirname, '..', 'commands', 'gsd');
@@ -36,6 +38,12 @@ function createFixtureAgentsDir() {
   return tmp;
 }
 
+describe('stageSkillsForRuntimeAsSkills', () => {
+  test('is exported as a function', () => {
+    assert.strictEqual(typeof stageSkillsForRuntimeAsSkills, 'function');
+  });
+});
+
 describe('stageSkillsForProfile', () => {
   test('full profile (skills === "*") returns srcDir unchanged', () => {
     const src = createFixtureSkillsDir();