docs: add repo instructions

AGENTS.md

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+# AGENTS.md
+
+## Repository Role
+
+This repository contains client-side data and runtime assets.
+
+Important contents:
+
+- `assets/root/`: Python-side client logic and UI scripts
+- `assets/pack.py`: packing workflow entrypoint
+- `assets/PackMaker.exe`: packing tool
+- `config/`: client config defaults
+
+## Working Rules
+
+- Keep server endpoint changes, login UI behavior, and root python edits here.
+- Do not commit private credentials, user-local secrets, or accidental personal config changes.
+- Be careful with packed asset workflows: change the source asset first, then repack intentionally.
+- Keep protocol-facing login behavior aligned with `m2dev-client-src` and `m2dev-server-src`.
+
+## Important Files
+
+Common login/server connection files:
+
+- `assets/root/serverinfo.py`
+- `assets/root/intrologin.py`
+- `assets/root/networkmodule.py`
+- `assets/root/constinfo.py`
+- `assets/root/localeinfo.py`
+
+## Operational Notes
+
+This repository is where client-visible server endpoint updates usually land.
+
+If the server address, auth/channel routing, or login UI flow changes:
+
+- update the relevant root scripts here
+- keep the packet/protocol side aligned with `m2dev-client-src`
+- verify against the current Debian server deployment
+
+## Cross-Repo Boundaries
+
+- asset/root/python/config changes belong here
+- client executable and C++ protocol code belong in `m2dev-client-src`
+- server runtime/deploy/docs belong in `m2dev-server`
+- server auth/packet implementation belongs in `m2dev-server-src`