Implementations page update - 2026.Q1

Description

The implementations page needs some updates from past and recent developments.

Tasks

• Add MapAddress (tpo/core/arti#735).
• Recent Arti changes affecting Onion Services (ChangeLog).
• Check/document on API stability.
• Open a ticket for the next iteration, using this one as a template.

Time estimation

• Complexity: very small (0.5 day)
• Uncertainty: low (x1.1)
• Reference (adapted)