docs: complete remaining core module docs

src/main.rs

@@ -1,3 +1,8 @@
+//! ## termscp
+//!
+//! Binary entry point for argument parsing, logging setup, and activity
+//! manager startup.
+
 mod activity_manager;
 mod cli;
 mod config;

src/utils/parser/ports.rs

@@ -1,3 +1,8 @@
+//! ## Parser Port Helpers
+//!
+//! Shared helpers for resolving default protocol ports and parsing explicit
+//! port captures from remote connection strings.
+
 use crate::filetransfer::FileTransferProtocol;
 
 pub(super) fn default_port_for_protocol(protocol: FileTransferProtocol) -> u16 {

src/utils/parser/protocol.rs

@@ -1,3 +1,8 @@
+//! ## Parser Protocol Helpers
+//!
+//! Detects the protocol prefix for remote connection strings and returns the
+//! remaining address payload.
+
 use std::str::FromStr;
 
 use super::REMOTE_OPT_PROTOCOL_REGEX;