Fix symlink resolution in exitrace

- Make SCRIPT_DIR robust for symlink execution
- Resolves lib/ dependency loading when called via ~/bin symlink
- Maintains compatibility with direct execution

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

legacy/exitrace/exitrace.sh

@@ -21,8 +21,8 @@
 
 set -euo pipefail
 
-# Script directory
-SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+# Script directory (symlink-robust)
+SCRIPT_DIR="$(cd "$(dirname "$(readlink -f "${BASH_SOURCE[0]}")")" && pwd)"
 
 # Load modules
 if [[ -f "$SCRIPT_DIR/lib/date_utils.sh" ]]; then