Two related bugs that surfaced together when a Discord response exceeded
2000 chars:
1. **Session id lost on mid-turn container exit.** `runPollLoop` was
calling `setStoredSessionId` only after `processQuery` returned. If
the container died between the SDK's `init` event (where session_id
arrives) and the stream completing, the id was never persisted. The
next wake called `getStoredSessionId()` → undefined and started a
fresh Claude session, dropping all prior context. Fix: persist
immediately in the `init` branch inside `processQuery`. The existing
post-query store becomes a harmless no-op.
2. **Silent truncation past adapter limits.** `chat-sdk-bridge.deliver`
handed full text straight to `adapter.postMessage`. Discord's adapter
hard-truncates at 2000 chars; Telegram's at 4096. Responses longer
than that were cut off without any signal to the user or host. Fix:
add `maxTextLength` to `ChatSdkBridgeConfig` and a `splitForLimit`
helper that breaks on paragraph → line → hard-char boundaries, then
posts chunks sequentially. Files ride on the first chunk; the
returned id is the first chunk's so edits and reactions still target
the reply head.
Channel adapter files (Discord, Telegram, …) live on the `channels`
branch — a companion PR wires `maxTextLength: 1900` for Discord and
`4000` for Telegram so the splitter actually engages in those installs.
Without wiring, behavior is unchanged.
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