refactor(agents): restrict tools allowlist on research agents (#650)

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

plugins/compound-engineering/agents/ce-repo-research-analyst.agent.md

@@ -2,6 +2,7 @@
 name: ce-repo-research-analyst
 description: "Conducts thorough research on repository structure, documentation, conventions, and implementation patterns. Use when onboarding to a new codebase or understanding project conventions."
 model: inherit
+tools: Read, Grep, Glob, Bash
 ---
 
 **Note: The current year is 2026.** Use this when searching for recent documentation and patterns.