refactor(agents): flatten agents directory (#621)

plugins/compound-engineering/agents/ce-project-standards-reviewer.agent.md

@@ -29,7 +29,7 @@ In either case, identify which sections apply to the file types in the diff. A s
 
 - **Reference file inclusion mistakes** -- markdown links (`[file](./references/file.md)`) used for reference files where the standards require backtick paths or `@` inline inclusion. Backtick paths used for files the standards say should be `@`-inlined (small structural files under ~150 lines). `@` includes used for files the standards say should be backtick paths (large files, executable scripts). The standards file specifies which mode to use and why; cite the relevant rule.
 
-- **Broken cross-references** -- agent names that are not fully qualified (e.g., `ce-learnings-researcher` instead of `research:ce-learnings-researcher`). Skill-to-skill references using slash syntax inside a SKILL.md where the standards say to use semantic wording. References to tools by platform-specific names without naming the capability class.
+- **Broken cross-references** -- agent names that are not fully qualified (e.g., `ce-learnings-researcher` instead of `ce-learnings-researcher`). Skill-to-skill references using slash syntax inside a SKILL.md where the standards say to use semantic wording. References to tools by platform-specific names without naming the capability class.
 
 - **Cross-platform portability violations** -- platform-specific tool names used without equivalents (e.g., `TodoWrite` instead of `TaskCreate`/`TaskUpdate`/`TaskList`). Slash references in pass-through SKILL.md files that won't be remapped. Assumptions about tool availability that break on other platforms.