chore: initial project setup with agent guide

.agent/skills/gsd-insert-phase/SKILL.md

@@ -0,0 +1,28 @@
+---
+name: gsd-insert-phase
+description: Insert urgent work as decimal phase (e.g., 72.1) between existing phases
+---
+
+
+<objective>
+Insert a decimal phase for urgent work discovered mid-milestone that must be completed between existing integer phases.
+
+Uses decimal numbering (72.1, 72.2, etc.) to preserve the logical sequence of planned phases while accommodating urgent insertions.
+
+Purpose: Handle urgent work discovered during execution without renumbering entire roadmap.
+</objective>
+
+<execution_context>
+@.agent/get-shit-done/workflows/insert-phase.md
+</execution_context>
+
+<context>
+Arguments: $ARGUMENTS (format: <after-phase-number> <description>)
+
+Roadmap and state are resolved in-workflow via `init phase-op` and targeted tool calls.
+</context>
+
+<process>
+Execute the insert-phase workflow from @.agent/get-shit-done/workflows/insert-phase.md end-to-end.
+Preserve all validation gates (argument parsing, phase verification, decimal calculation, roadmap updates).
+</process>