feat(agents): streamline version update UX with interactive prompts

[homich1991]

Summary

This PR streamlines the user experience when Claude Code (or other agents) version mismatches are detected. Instead of cryptic exits or binary yes/no confirmations, users are now presented with clear, actionable list prompts that guide them through the version update process.

Changes

• Scenario 0 (below minimum version): Replaced hard process.exit(1) with a 2-option interactive prompt — install the supported version now and continue, or exit with manual update instructions. Also surfaces the recommended version alongside the minimum.
• Scenario 1 (running newer than supported): Replaced confirm prompt ("Continue anyway?") with a 3-option list — install supported version, continue with current, or exit showing relevant install commands.
• Scenario 2 (update available): Replaced confirm prompt ("Continue with current version?") with a 3-option list — install new version, continue with current, or exit with the update command.
• All scenarios now use an else if chain to prevent stale compatibility state from triggering multiple prompts after an install action.
• Removed duplicate success messages (npm already outputs its own).

Impact

Before: Users hit silent exits or ambiguous yes/no confirmations when version issues were detected.

After: Users see a clear list of options and are guided with exact commands to run if they choose to exit manually.

Checklist

• Self-reviewed
• Manual testing performed
• Documentation updated (if needed)
• No breaking changes (or clearly documented)