feat: add llmx config, update arty references to dev.pivoine.art

- Add .llmx/ directory for LLM configuration
- Update bin repo URL to dev.pivoine.art
- Add home-llmx reference to arty.yml
- Add uv/install script for Python package manager
- Update debian/install with additional packages
- Add debian/update script for non-free repos
- Update README.md to reflect changes

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

arty.yml

@@ -50,8 +50,10 @@ notes: |
   - Ensure SSH agent has only one key for pushing
 
 references:
-  - url: git@github.com:valknarogg/bin.git
+  - url: https://dev.pivoine.art/valknar/bin.git
     into: bin
+  - url: https://dev.pivoine.art/valknar/home-llmx.git
+    into: .llmx
   - url: https://github.com/nvm-sh/nvm.git
     into: .nvm
   - url: https://github.com/moovweb/gvm.git
@@ -81,7 +83,8 @@ scripts:
   rust/install: curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
   node/install: nvm install
   ruby/install: rbenv install
-  python/install: pyenv/install
+  python/install: pyenv install
+  uv/install: curl -LsSf https://astral.sh/uv/install.sh | sh
   zed/install: curl -f https://zed.dev/install.sh | sh
   claude/install: curl -fsSL https://claude.ai/install.sh | bash
   mattermost/install: