Release v4.0.0 - Major Feature Release

This release includes:
- Complete GUI overhaul with Validation, Recon, Findings, and WebSocket tabs
- Persistent status bar for engagement/scope/auth management
- Per-engagement data isolation and single TOML config file
- Optional Chromium bundling in standalone releases
- Security and stability improvements

Release workflow triggered at: 2026-09-08T22:17:50Z
