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

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

plugins/compound-engineering/skills/ce-sessions/SKILL.md

@@ -26,7 +26,7 @@ If the lines above resolved to plain values (a folder name like `my-repo` and a
 
 If no argument is provided, ask what the user wants to know about their session history. Use the platform's blocking question tool (`AskUserQuestion` in Claude Code, `request_user_input` in Codex, `ask_user` in Gemini). If no question tool is available, ask in plain text and wait for a reply.
 
-Dispatch `compound-engineering:research:session-historian` with the user's question as the task prompt. Omit the `mode` parameter so the user's configured permission settings apply. Include in the dispatch prompt:
+Dispatch `research:ce-session-historian` with the user's question as the task prompt. Omit the `mode` parameter so the user's configured permission settings apply. Include in the dispatch prompt:
 
 - The user's question
 - The current working directory