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/openclaw-converter.test.ts

@@ -249,7 +249,7 @@ describe("convertClaudeToOpenClaw", () => {
       ...fixturePlugin,
       skills: [
         {
-          name: "ce:plan",
+          name: "ce-plan",
           description: "Planning skill",
           sourceDir: "/tmp/plugin/skills/ce-plan",
           skillPath: "/tmp/plugin/skills/ce-plan/SKILL.md",