docs(copilot): document workflow rediscovery (#1943)

* docs(copilot): document workflow rediscovery

* test(copilot): pair discovery claims

* docs(copilot): harden workflow recovery guidance

docs-lab/reference/supported-tools.md

@@ -102,8 +102,13 @@ Skills stay in `.cline/skills/`.
 
 ### GitHub Copilot
 
-Prompt files register as slash commands in the Copilot IDE extensions (VS Code,
-JetBrains, Visual Studio). Copilot CLI does not read `.github/prompts/`.
+- **IDE extensions (command delivery)**: VS Code, JetBrains, and Visual Studio load
+  `.github/prompts/opsx-<id>.prompt.md` as `/opsx-<id>`. If a command disappears
+  while its file still exists, restart the IDE.
+- **Copilot CLI (skill delivery)**: the CLI ignores `.github/prompts/` and loads
+  `.github/skills/openspec-*/SKILL.md` instead. Invoke a skill as
+  `/openspec-<skill>`. If a skill disappears while its file still exists, run
+  `/skills reload`, then `/skills info openspec-propose` to confirm discovery.
 
 ### Hermes Agent
 

test/core/init.test.ts

@@ -1594,12 +1594,20 @@ describe('InitCommand', () => {
       expect(await fileExists(cmdFile)).toBe(true);
     });
 
-    it('should generate GitHub Copilot prompt files', async () => {
+    it('should generate GitHub Copilot prompt and skill files with default delivery', async () => {
       const initCommand = new InitCommand({ tools: 'github-copilot', force: true });
       await initCommand.execute(testDir);
 
       const cmdFile = path.join(testDir, '.github', 'prompts', 'opsx-explore.prompt.md');
+      const skillFile = path.join(
+        testDir,
+        '.github',
+        'skills',
+        'openspec-explore',
+        'SKILL.md'
+      );
       expect(await fileExists(cmdFile)).toBe(true);
+      expect(await fileExists(skillFile)).toBe(true);
     });
 
     it('should fail GitHub Copilot setup without partially creating cloud files', async () => {