Fixed three remaining issues from Codex's final review:
**1. nullglob State Management (line 3124)**
- Replaced shopt -s/u nullglob with compgen -G check
- Prevents changing global shell behavior that could affect later globs
- More explicit and safer pattern matching
**2. authorized_keys Permission Preservation (lines 3116-3117)**
- Now uses chmod/chown --reference to preserve original ownership/perms
- Falls back gracefully if --reference not available
- Proper cleanup on mv failure to prevent temp file leaks
- Aborts atomically if operations fail, leaving original untouched
**3. Multi-Address Container Detection (lines 3750-3761)**
- Iterates over ALL IPs from hostname -I, not just first one
- Handles dual-stack (IPv4 + IPv6) and multi-IP containers
- Uses break 2 to exit both loops when match found
- Prevents false negatives when Pulse IP is not the first address
All operations now handle edge cases properly: non-root accounts,
dual-stack networking, empty directories, and partial failures.
Addresses #123
e0d7cc7f58