feat: initialize opencode-owui-sync project

AGENTS.md

@@ -0,0 +1,17 @@
+# Project Rules & Architecture
+<!-- Static sections below are for humans and AI agents to read.         -->
+<!-- ## Current State and ## Session Log are managed by owui-sync plugin. -->
+
+## Architecture
+<!-- Add project-specific architecture notes here. -->
+
+## Conventions
+<!-- Add coding conventions, naming rules, etc. here. -->
+
+## Current State
+<!-- Updated by owui-sync plugin on session end -->
+<!-- Single section, overwritten each time -->
+- No sessions logged yet.
+
+## Session Log
+<!-- Append-only, newest first -->