fix: resolve build errors and add comprehensive symlink tests

- Fixed E0425 error in src/skills/mod.rs by moving println! inside #[cfg(unix)] block where 'dest' variable is in scope
- Added missing 'identity' field to Config struct initializations in src/onboard/wizard.rs
- Fixed import paths for AIEOS identity functions in src/channels/mod.rs
- Added comprehensive symlink edge case tests in src/skills/symlink_tests.rs
- All 840 tests passing, 0 clippy warnings

Resolves issue #28: skills symlink functionality now works correctly on Unix platforms with proper error handling on non-Unix platforms

src/onboard/wizard.rs

@@ -101,6 +101,7 @@ pub fn run_wizard() -> Result<Config> {
         composio: composio_config,
         secrets: secrets_config,
         browser: BrowserConfig::default(),
+        identity: crate::config::IdentityConfig::default(),
     };
 
     println!(
@@ -253,6 +254,7 @@ pub fn run_quick_setup(api_key: Option<&str>, provider: Option<&str>) -> Result<
         composio: ComposioConfig::default(),
         secrets: SecretsConfig::default(),
         browser: BrowserConfig::default(),
+        identity: crate::config::IdentityConfig::default(),
     };
 
     config.save()?;