Bump version from 1.3.0 to 1.4.0

[KIvanow]

Summary

Changes

Checklist

• Unit / integration tests added
• Docs added / updated
• Roborev review passed — run roborev review --branch or /roborev-review-branch in Claude Code (internal)
• Competitive analysis done / discussed (internal)
• Blog post about it discussed (internal)

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Note

Low Risk
Low risk change limited to a package version bump and newline formatting in packages/agent/package.json, with no runtime logic changes.

Overview
Bumps @betterdb/agent version from 1.3.0 to 1.4.0 in packages/agent/package.json (and normalizes the file to end with a newline).

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