Release Vigil 7.1.0

[Sequela02]

Summary

• Adds reusable step-up authorization with personal PIN support.
• Refactors the public documentation into canonical, task-focused guides.
• Prepares release version 7.1.0 and tag v7.1.0.

Verification

• gradlew.bat clean check --no-daemon
• gradlew.bat publishToMavenLocal --no-daemon

Release

• Tag v7.1.0 is already present remotely.
• Merge after required checks and review; publication remains guarded by the repository release workflow.