Abiba (pi)
cb83baf299
Adds two improvements from pi Zulip extension lessons: 1. _ensure_stream_subscriptions() — checks at connect time if the bot is subscribed to the primary stream and general-chat; auto-subscribes if missing. Without this, bots with 0 subscriptions can't receive stream events (DMs only). 2. selftest check #9 — verifies stream subscriptions and reports count + names. Catches the 'zero subscriptions' failure mode that was a major debugging bottleneck in the pi extension.