Function pacsea_doas_persist_configured 

pub fn pacsea_doas_persist_configured() -> bool

What: Detect whether the system doas.conf appears configured with a persist rule.

Inputs: None.

Output:

• true when /etc/doas.conf exists and contains an active permit persist rule.

Details:

• Read-only check; never mutates system files.
• Returns false on missing/unreadable config or parse mismatch.