feat: add my state update command

meant to be used with the docs and memory-bank protocol, but should be somewhat generic

commands/state-update.md

@@ -0,0 +1,12 @@
+---
+description: Update the project state
+agent: build
+model: opencode/minimax-m2.5-free
+---
+
+Observe any project state or memory instructions you were given. Update that information accordingly.
+
+If you do not have any instructions related to memory or tacking the project state, do nothing.
+
+Inform the user what action you took either way, even if it was no action.
+