feat(channels): listen on #development (KDF-derived PSK)

Add #development to the built-in hashtag channel set; its PSK is
derived from the channel name via the standard MeshCore hashtag KDF.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

orac/crypto.py

@@ -256,6 +256,7 @@ _BUILTIN_HASHTAG_CHANNELS: tuple[str, ...] = (
     "#weather",
     "#protest",
     # --- Dev / testing ---
+    "#development",
     "#devtest",
     "#devtestdevtest",
 )