init silently succeeds without validating language server availability

[meghasharma-dev]

Issue

/code init completes successfully without warnings when required language servers
(e.g., jdtls) are missing from PATH. Error only appears later when using /code features.

Steps to Reproduce

1. Ensure jdtls is NOT in PATH: which jdtls
2. Run /code init in Java project
3. Command succeeds with no warnings
4. Try /code feature (find definition)
5. Error: "Failed to start language server 'jdtls': No such file or directory"

Expected Behavior

/code init should detect missing language servers and warn user with installation
instructions before claiming success.

Environment

• OS: macOS
• Q CLI version: 1.24.0