feat: show version info in agentage status

[vreshch]

Summary

• Adds Version: line to agentage status output showing current daemon version
• When an update is available: Version: 0.12.3 → 0.13.0 available (yellow)
• JSON output includes version: { current, latest, updateAvailable }
• Uses the existing cached update checker (no extra network call)

Test plan

• agentage status shows version line
• agentage status --json includes version object
• Build passes

[github-actions]

🎉 PR Validation ✅ PASSED

Commit: 153ea8e1abd9499937ac66b0d203db4f4248bfc8
Branch: feature/status-version

Checks:

• ✅ Release guard (no version/changelog changes)
• ✅ Dependencies installed
• ✅ Type check passed
• ✅ Linting passed
• ✅ Format check passed
• ✅ Tests + coverage passed
• ✅ Build successful

Ready to merge! ✨

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⏰ Generated at: 2026-03-29T14:39:40.372Z