Add basecamp (basecamp-cli) as a lazy-installed mise tool (#10943)

Mirrors the hey-cli stub: the wrapper in ~/.local/bin installs and
upgrades through mise on first run, so the CLI tracks releases instead
of going stale as a manually dropped binary.

Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>

migrations/1788941927.sh

@@ -0,0 +1,5 @@
+echo "Install basecamp (basecamp-cli) via mise wrapper"
+
+if [[ ! -f $HOME/.local/state/omarchy/preinstalls-removed ]]; then
+  omarchy-mise-install github:basecamp/basecamp-cli basecamp
+fi