refactor: Harden and improve SSH agent module

- Add extensive security validations for SSH agent
- Implement robust `ssh-agent` auto-start script
- Enhance `sshagent` operations with improved error handling
- Revamp `sshagent` test suite for comprehensive coverage
- Update `sshagent` README with detailed documentation

lib/core/base/factory_context.v

@@ -1,9 +1,6 @@
 module base
 
 import freeflowuniverse.herolib.data.paramsparser
-import freeflowuniverse.herolib.ui
-import freeflowuniverse.herolib.ui.console
-import crypto.md5
 
 @[params]
 pub struct ContextConfigArgs {