chore: initial project setup with agent guide

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

@@ -0,0 +1,29 @@
+---
+name: gsd-note
+description: Zero-friction idea capture. Append, list, or promote notes to todos.
+---
+
+<objective>
+Zero-friction idea capture — one Write call, one confirmation line.
+
+Three subcommands:
+- **append** (default): Save a timestamped note file. No questions, no formatting.
+- **list**: Show all notes from project and global scopes.
+- **promote**: Convert a note into a structured todo.
+
+Runs inline — no Task, no AskUserQuestion, no Bash.
+</objective>
+
+<execution_context>
+@.agent/get-shit-done/workflows/note.md
+@.agent/get-shit-done/references/ui-brand.md
+</execution_context>
+
+<context>
+$ARGUMENTS
+</context>
+
+<process>
+Execute the note workflow from @.agent/get-shit-done/workflows/note.md end-to-end.
+Capture the note, list notes, or promote to todo — depending on arguments.
+</process>