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/StatusBar.jsx

@@ -0,0 +1,44 @@
+// StatusBar — bottom rail. Mono, dense, 24px tall.
+
+const StatusBar = ({ branch, problems, position, syntax }) => (
+  <div style={sbStyles.root}>
+    <div style={sbStyles.left}>
+      <span style={sbStyles.cell}>
+        <Icon name="git-branch" size={12}/> {branch}
+      </span>
+      <span style={{ ...sbStyles.cell, color: problems.errors ? '#ff854f' : 'var(--fg-2)' }}>
+        <Icon name="x" size={12}/> {problems.errors}
+      </span>
+      <span style={{ ...sbStyles.cell, color: problems.warnings ? '#ffe14e' : 'var(--fg-2)' }}>
+        <Icon name="alert" size={12}/> {problems.warnings}
+      </span>
+    </div>
+    <div style={sbStyles.right}>
+      <span style={sbStyles.cell}>{syntax}</span>
+      <span style={sbStyles.cell}>UTF-8</span>
+      <span style={sbStyles.cell}>LF</span>
+      <span style={sbStyles.cell}>{position}</span>
+      <span style={{ ...sbStyles.cell, color: '#51e08a' }}>
+        <Icon name="circle" size={8}/> live
+      </span>
+    </div>
+  </div>
+);
+
+const sbStyles = {
+  root: {
+    height: 26, flex: '0 0 26px',
+    display: 'flex', justifyContent: 'space-between',
+    padding: '0 14px',
+    background: '#222531',
+    borderTop: '1px solid #373b46',
+    fontFamily: 'var(--font-mono)', fontSize: 11,
+    color: 'var(--fg-2)',
+    letterSpacing: '0.03em',
+  },
+  left:  { display:'flex', alignItems:'center', gap: 14 },
+  right: { display:'flex', alignItems:'center', gap: 14 },
+  cell:  { display:'flex', alignItems:'center', gap: 5 },
+};
+
+window.StatusBar = StatusBar;