ad85e43809
Re-implement PR #2690 against current upstream/dev since original branch became incompatible with codebase refactoring. Changes: - Import loadUserAgents and loadProjectAgents from claude-code-agent-loader - Merge user/project agents with server agents in resolveSubagentExecution() - Server agents take precedence on name collisions - Primary-mode agents from user/project are filtered out Tests: 4 new test cases covering user agent resolution, project agent resolution, server precedence, and primary agent filtering.