Polish docs and repo hygiene

UNINSTALL.md

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+# Uninstall
+
+## Linux / WSL (global)
+
+Remove installed files:
+
+```bash
+sudo rm -f /etc/profile.d/ps1.sh /etc/profile.d/banner.sh
+sudo rm -f /etc/ps1-season /etc/ps1-style /etc/ps1-punchline
+```
+
+Remove the managed block from `/etc/bash.bashrc`:
+
+```bash
+sudo sed -i '/# >>> dotfiles (managed) >>>/,/# <<< dotfiles (managed) <<</d' /etc/bash.bashrc
+```
+
+Open a new shell to confirm the prompt is gone.
+
+## macOS (per-user)
+
+Remove installed files:
+
+```bash
+rm -f ~/.config/ps1/ps1.sh ~/.config/ps1/season ~/.config/ps1/style
+```
+
+Remove the managed block from your shell configs:
+
+```bash
+sed -i '' '/# >>> user ps1 (managed) >>>/,/# <<< user ps1 (managed) <<</d' ~/.bashrc
+sed -i '' '/# >>> user ps1 (managed) >>>/,/# <<< user ps1 (managed) <<</d' ~/.bash_profile
+```
+
+Open a new shell or run `source ~/.bashrc`.