feat: Add initial documentation for AI agents

AGENTS.md

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+# Info For AI Agents
+
+All cogs from the cogs directory are automatically loaded by default. (in the main bot, at least. neru and gurt have hardcoded lists. but these bots are irrelevant unless specifically mentioned.)
+If you need to exclude a cog from being loaded, check commands.py.
+Hybrid commands are preferred to only legacy prefix commands unless specifcally requested.
+Pytest (pytest -q) won't work in this environment, so don't run it.
+At most, just try `python -m py_compile` to make sure the file has no errors.