refactor(cli)!: rename all skills and agents to consistent ce- prefix (#503)

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/release-preview.test.ts

@@ -5,8 +5,8 @@ describe("release preview", () => {
   test("uses changed files to determine affected components and next versions", async () => {
     const versions = await loadCurrentVersions()
     const preview = await buildReleasePreview({
-      title: "fix: adjust ce:plan-beta wording",
-      files: ["plugins/compound-engineering/skills/ce-plan-beta/SKILL.md"],
+      title: "fix: adjust ce-plan wording",
+      files: ["plugins/compound-engineering/skills/ce-plan/SKILL.md"],
     })
 
     expect(preview.components).toHaveLength(1)