[Upstream #207] Add Untether — Telegram bridge with OpenCode support (#64)

* Add Untether — Telegram bridge with OpenCode support

* chore: move the README edit to a data/ entry

README.md and dist/registry.json are generated from data/ now.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01EHYZtiXaVB71TSBhHnynk4

---------

Co-authored-by: Nathan Schram <[email protected]>
Co-authored-by: John Smith <[email protected]>
Co-authored-by: Claude Opus 5.5 <[email protected]>

data/projects/untether.yaml

@@ -0,0 +1,9 @@
+name: Untether
+repo: https://github.com/littlebearapps/untether
+tagline: Telegram bridge for remote task control
+description: Telegram bridge for OpenCode (and 5 other agents). Send tasks by voice or text, stream progress live, and manage sessions remotely. Supports 75+ providers via OpenCode's model system.
+kind: client
+topics:
+  - remote
+  - sessions
+compat: n/a