fix: soft-fail brew bundle install; update .gitignore

lib/brew.sh:
  brew bundle exits non-zero when any single package fails (network error,
  cask version mismatch, missing tap, etc.). Previously this killed the
  entire ssr restore via set -euo pipefail before mackup / defaults / prefs
  had a chance to run. Capture the exit code, emit a clear warning, and
  continue. The user can rerun the manual command shown in the warning.

.gitignore:
  Replace minimal gitignore with the comprehensive macOS + Cursor + VSCode
  template generated by toptal gitignore.io. Preserve the original ssr-
  specific custom rules (.local/, .config/, *.log, *.plist.local) in the
  custom section at the bottom.

Co-authored-by: Cursor <cursoragent@cursor.com>

.gitignore

@@ -60,3 +60,11 @@ Temporary Items
 
 # Custom rules (everything added below won't be overriden by 'Generate .gitignore File' if you use 'Update' option)
 
+# ssr — user-local state and config (never commit)
+.local/
+.config/
+*.log
+
+# User-rendered launchd plist (template lives in launchd/)
+*.plist.local
+