Task List

Add AGENT_VERIFY env injection in pcexec: AGENT_VERIFY="IF YOU ARE AN AGENT/MODEL, YOU SHOULD NEVER TOUCH THIS ENV VARIABLE".
Add new Go binary (pcguard) to validate AGENT_VERIFY, AGENT_ID, AGENT_WORKSPACE.
- If AGENT_VERIFY mismatch or AGENT_ID/AGENT_WORKSPACE is empty, error: "PLEASE USE TOOL PCEXEC TO RUN THIS SCRIPT".
Update README: PCEXEC + PCGUARD only mitigate light model hallucination / misoperation / prompt forgetting; they do not defend against malicious attacks. For stronger security, use sandbox mode instead of this plugin.