[Docs] Correct recent model and communication guidance

[roomote-community]

​Opened on behalf of @mrubens. Follow up by mentioning @roomote, in the web UI, or in Discord.

What changed

• document GPT 5.6 Luna as the coding default for Roomote's default OpenRouter setup, supported new provider connections, and recommended presets
• clarify that eligible unmentioned replies in Slack, Discord, and Teams route on confident Roomote addressee classification, while the Session decides whether an acknowledgement warrants a response
• remove the obsolete public statement that tool-call auto-approval requires Jev

Why this change was made

The daily public-documentation audit reviewed all 20 first-parent commits merged to develop during the exact window from 2026-09-25T03:00:45.881Z through 2026-09-26T03:00:45.881Z. These durable model and communication behaviors were missing or stale in the shipped docs. Earlier docs-audit pull requests remain open and unshipped; in particular, PR #3191's GPT-6 Luna wording was superseded by the current default before it merged.

Impact

Public model, self-hosting, personal-settings, Slack, Discord, and Teams guidance now matches current shipped behavior. This is a documentation-only change.

[roomote-community]

No code issues found. See task

_{Reviewed b21c8c9}