feat: fold in the portable Claude Code, zsh and git config; add a drift check

Added (all now linked from their live locations):
- home_root/.claude/settings.json. The statusLine command now uses $HOME
  instead of a Linux-only absolute path.
- home_root/.claude/bin/ratecheck and home_root/.claude/skills/australis-design.
- home_config/zsh/claude-config-dir.zsh and home_root/.local/bin/claude-config-dir-init,
  the per-repo Claude Code login helper and its seeding script.
- home_root/.gitconfig and home_config/git/ignore.
- home_root/.zshenv, with the cargo env line guarded so boxes without rust start clean.

link-dotfiles --check reports drift without changing anything: tracked files whose
live copy is no longer a link (stow dry-run conflicts) and links into this repo
that dangle. Exits 1 on drift. Verified against a clean baseline and two planted
drifts, a detached .nanorc and a dangling link.

.mailmap maps every earlier identity to Vuong Hoang: the repo-local 'Your Name'
placeholder config (now removed), host-generated emails, and aider suffixes.

CLAUDE.md: the symlink warning now lists every linked file and points at --check.
README: documents what is and isn't tracked under .claude, the edit rule, and --check.

home_root/.claude/skills/australis-design/ui_kits/terminal/README.md

@@ -0,0 +1,26 @@
+# Australis — Terminal UI Kit
+
+The signature surface for Australis: a developer tool combining a terminal, a code editor, a file sidebar, and a status bar. This is what the system was built for.
+
+## Files
+
+- `index.html` — interactive demo wiring everything together
+- `Sidebar.jsx` — file tree + workspace switcher
+- `Editor.jsx` — tabbed code editor with syntax tokens
+- `Terminal.jsx` — bottom panel terminal with prompt + output
+- `StatusBar.jsx` — bottom rail (branch, syntax, line/col)
+- `CommandPalette.jsx` — ⌘K palette overlay
+- `Icon.jsx` — Lucide-style inline icons (1.75 stroke, currentColor)
+
+## What's interactive
+
+- Click sidebar files to switch editor tabs
+- Click the workspace pill in the top-left to cycle workspaces
+- Type into the terminal prompt and hit `Enter` — outputs are faked but feel right
+- Press `⌘K` (or click the search field) to open the command palette
+- Hover/focus states honor the system
+
+## Visual sources
+
+- `colors_and_type.css` — all tokens
+- `README.md` (root) — visual foundations and content rules