Reflection follow-up: rewrite missing substrate file pr-safe-close.jsonl

Missing path: ~/openclaw/logs/pr-safe-close.jsonl Referenced in: PR-DEDUP-PROTOCOL.md lines 95 and 181. Presumed contents: JSONL audit log file; one row per pr-safe-close.sh decision (CLOSE, BLOCK, or dry-run). Created on first invocation of pr-safe-close.sh with a proper close or dry-run. Action: create the directory ~/openclaw/logs/ if it does not exist, then create an empty pr-safe-close.jsonl to initialize the audit trail. This is a low-effort fix (mkdir + touch). Depends on pr-safe-close.sh being restored first.