docs: Add basic AI guidelines and documentation

docs/linting.md

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+# Linting And Test Flow
+
+MoonWell Launcher supports the latest stable Flutter SDK only. Do not use FVM
+for this project.
+
+## Required Checks
+
+Run these commands before committing:
+
+```powershell
+dart format --set-exit-if-changed .
+flutter analyze
+flutter test
+```
+
+Use `dart format .` to apply formatting fixes when the format check fails.
+
+## Lefthook
+
+This repository includes `lefthook.yml` with a `pre-commit` hook that runs the
+same format, analyze, and test flow.
+
+Install Lefthook once on your machine, then install the Git hook from the repo
+root:
+
+```powershell
+lefthook install
+```
+
+Run the pre-commit flow manually with:
+
+```powershell
+lefthook run pre-commit
+```
+
+If `lefthook` is not available, install it with your preferred package manager
+from the official Lefthook distribution, then rerun `lefthook install`.
+
+## Windows Troubleshooting
+
+If Flutter reports that building with plugins requires symlink support, enable
+Windows Developer Mode and rerun the command.