chore: initial project setup with agent guide

.agent/skills/gsd-help/SKILL.md

@@ -0,0 +1,23 @@
+---
+name: gsd-help
+description: Show available GSD commands and usage guide
+---
+
+<objective>
+Display the complete GSD command reference.
+
+Output ONLY the reference content below. Do NOT add:
+- Project-specific analysis
+- Git status or file context
+- Next-step suggestions
+- Any commentary beyond the reference
+</objective>
+
+<execution_context>
+@.agent/get-shit-done/workflows/help.md
+</execution_context>
+
+<process>
+Output the complete GSD command reference from @.agent/get-shit-done/workflows/help.md.
+Display the reference content directly — no additions or modifications.
+</process>