Configuration file execution not implemented

[tapvt]

Problem

The loadConfigFile() function in internal/shell/shell.go:267-271 is currently just a stub implementation that returns nil without actually executing configuration files.

Impact

• Configuration files (.goshrc, .gosh_profile) are not actually executed
• Users cannot customize their shell environment through config files
• This breaks a core documented feature of the shell

Current Implementation

The function is a stub that just returns nil with a comment saying implementation will be added later.

Expected Behavior

The function should:

1. Read the specified configuration file
2. Parse and execute shell commands from the file
3. Apply aliases, exports, and other configurations
4. Handle errors appropriately

Files Affected

• internal/shell/shell.go (lines 267-271)
• Configuration loading logic needs to be implemented

Priority

Critical - This is a core shell functionality that users expect to work.

Reference

See TODO.md item #1