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/agents/design/ce-design-implementation-reviewer.agent.md

@@ -1,5 +1,5 @@
 ---
-name: design-implementation-reviewer
+name: ce-design-implementation-reviewer
 description: "Visually compares live UI implementation against Figma designs and provides detailed feedback on discrepancies. Use after writing or modifying HTML/CSS/React components to verify design fidelity."
 model: inherit
 ---

plugins/compound-engineering/agents/design/ce-design-iterator.agent.md

@@ -1,5 +1,5 @@
 ---
-name: design-iterator
+name: ce-design-iterator
 description: "Iteratively refines UI design through N screenshot-analyze-improve cycles. Use PROACTIVELY when design changes aren't coming together after 1-2 attempts, or when user requests iterative refinement."
 color: violet
 model: inherit

plugins/compound-engineering/agents/design/ce-figma-design-sync.agent.md

@@ -1,5 +1,5 @@
 ---
-name: figma-design-sync
+name: ce-figma-design-sync
 description: "Detects and fixes visual differences between a web implementation and its Figma design. Use iteratively when syncing implementation to match Figma specs."
 model: inherit
 color: purple