docs: remove GSD agent workflow references from AGENTS.md

Remove outdated GSD (Get Stuff Done) agent selection and workflow sections.
The GSD framework is no longer used in this repository's AI workflow.

Author: castrojo

AGENTS.md

@@ -4,53 +4,6 @@ Bluefin documentation is a Docusaurus 3.8.1 TypeScript website that provides com
 
 **Always reference these instructions first and fallback to search or bash commands only when you encounter unexpected information that does not match the info here.**
 
-## GSD Agent Selection - ALWAYS REMIND USER
-
-**CRITICAL: Before starting ANY GSD work, ALWAYS ask the user:**
-
-```
-🤖 AGENT SELECTION CHECKPOINT
-
-I'm about to work on: [brief description of task]
-
-Recommended agent: [agent-name]
-Reason: [why this agent fits]
-
-Alternatives:
-- [other-agent]: [when to use instead]
-- [quick-task/yourself]: [if simpler approach exists]
-
-Should I proceed with [recommended-agent], or would you prefer a different approach?
-
-📚 See .planning/AGENT-SELECTION-GUIDE.md for detailed guidance
-```
-
-**When transitioning between GSD phases, ALWAYS remind:**
-
-```
-✅ [Previous Phase] Complete: [what was accomplished]
-
-🔄 Next Phase: [what's next]
-Recommended agent: [agent-name]
-Reason: [why]
-
-Example workflow:
-- Research phase done → Planning phase needed → Use gsd-planner
-- Planning phase done → Implementation needed → Use gsd-executor
-- Implementation hit a bug → Investigation needed → Use gsd-debugger
-
-Should I spawn [recommended-agent] or continue differently?
-```
-
-**Key principles:**
-
-- ✅ ALWAYS pause to confirm agent choice before spawning
-- ✅ ALWAYS explain why that agent is appropriate
-- ✅ ALWAYS mention simpler alternatives (quick task, direct action)
-- ✅ ALWAYS reference the agent selection guide
-- ❌ NEVER assume you know which agent the user wants
-- ❌ NEVER auto-spawn agents without checking first
-
 ## Work Tracking with Beads
 
 **This repository uses [Beads](https://github.com/block/beads) for issue tracking.**