Manage Claude Code config + add Justfile via bombadil

Bring ~/.claude config under bombadil management across both machines:
- claude/shared/: converged settings.json (union of both hosts) and a single
  Catppuccin-powerline statusline merged from the two machines' versions
- claude/xps, claude/desktop: per-host agents/skills behind [profiles.xps]/
  [profiles.desktop]; each host links only its own via `bombadil link -p <theme> <host>`

Linked at file granularity because bombadil 4.2.0 can't create directory
symlinks for new targets, and to keep ~/.claude/{agents,skills} real dirs.

Add a Justfile (symlinked to ~/.justfile, usable via `just -g`) with link/
dark/light/watch/unlink/update/status/edit recipes; host auto-detected from
hostname. Recipes use exported shell vars to avoid bombadil's Tera engine
mis-parsing just's double-brace interpolation.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Justfile

@@ -0,0 +1,55 @@
+# Dotfiles task runner (bombadil + git).
+#
+# Symlinked to ~/.justfile by bombadil, so it works as just's global justfile:
+#   just -g <recipe>      # from anywhere
+#   just <recipe>         # from $HOME
+#
+# Recipes reference exported variables as shell $vars rather than just's
+# double-brace interpolation: bombadil renders every dotfile through Tera, which
+# would try to evaluate a double-brace expression as a template variable.
+
+# Theme profile to link with: dark or light.
+export theme := "dark"
+
+# Host profile, auto-detected from hostname. Each machine links only its own
+# Claude agents/skills; everything else is shared.
+export host := if `hostname` == "daniel-desktop" { "desktop" } else { "xps" }
+
+# List available recipes.
+default:
+    @just -g --list
+
+# Re-link all dotfiles for this host and theme.
+link:
+    bombadil link -f -p "$theme" "$host"
+
+alias relink := link
+
+# Re-link with the dark theme.
+dark:
+    bombadil link -f -p dark "$host"
+
+# Re-link with the light theme.
+light:
+    bombadil link -f -p light "$host"
+
+# Watch dotfiles and re-link automatically on change.
+watch:
+    bombadil watch -f -p "$theme" "$host"
+
+# Remove all bombadil-managed symlinks.
+unlink:
+    bombadil unlink
+
+# Pull the latest dotfiles from the remote and re-link.
+update:
+    git -C ~/src/dotfiles pull --ff-only
+    bombadil link -f -p "$theme" "$host"
+
+# Show the dotfiles repo's git status.
+status:
+    git -C ~/src/dotfiles status
+
+# Open the bombadil config in $EDITOR.
+edit:
+    $EDITOR ~/src/dotfiles/bombadil.toml