[BUG] Agent response is too large for Telegram

[auloin]

What happened?

Reported by @soufianebouaddis: #38 (comment).

Telegram has a 4096 character limit per message. When the agent's answer is higher than the limit, the message is not sent.

Relevant logs

2026-04-22T19:01:36.487+01:00  INFO 80461 --- [JavaClaw] [pool-4-thread-1] a.j.channels.telegram.TelegramChannel    : Voice message received, downloading audio
2026-04-22T19:01:37.191+01:00  INFO 80461 --- [JavaClaw] [pool-4-thread-1] a.j.s.WhisperCppSpeechToTextService      : Transcribing audio via whisper-cpp (model: /Users/snof/whisper-models/ggml-small.bin)
2026-04-22T19:01:38.542+01:00  INFO 80461 --- [JavaClaw] [pool-4-thread-1] a.j.s.WhisperCppSpeechToTextService      : whisper-cpp transcription completed successfully
2026-04-22T19:01:38.543+01:00  INFO 80461 --- [JavaClaw] [pool-4-thread-1] a.j.channels.telegram.TelegramChannel    : Voice message transcribed successfully
2026-04-22T19:02:24.338+01:00  WARN 80461 --- [JavaClaw] [pool-4-thread-1] a.j.channels.telegram.TelegramChannel    : Failed to send HTML parsed message, falling back to raw text.

Exception in thread "pool-4-thread-1" java.lang.RuntimeException: Failed to send both HTML and fallback messages
	at ai.javaclaw.channels.telegram.TelegramChannel.sendMessage(TelegramChannel.java:136)
	at ai.javaclaw.channels.telegram.TelegramChannel.consume(TelegramChannel.java:100)
	at org.telegram.telegrambots.longpolling.util.LongPollingSingleThreadUpdateConsumer.lambda$consume$0(LongPollingSingleThreadUpdateConsumer.java:15)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1090)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:614)
	at java.base/java.lang.Thread.run(Thread.java:1474)
Caused by: Error executing org.telegram.telegrambots.meta.api.methods.send.SendMessage query: [400] Bad Request: message is too long
	at org.telegram.telegrambots.meta.api.methods.botapimethods.PartialBotApiMethod.deserializeResponseInternal(PartialBotApiMethod.java:63)
	at org.telegram.telegrambots.meta.api.methods.botapimethods.PartialBotApiMethod.deserializeResponse(PartialBotApiMethod.java:43)
	at org.telegram.telegrambots.meta.api.methods.botapimethods.BotApiMethodMessage.deserializeResponse(BotApiMethodMessage.java:24)
	at org.telegram.telegrambots.meta.api.methods.botapimethods.BotApiMethodMessage.deserializeResponse(BotApiMethodMessage.java:17)
	at org.telegram.telegrambots.client.okhttp.OkHttpFutureCallback.onResponse(OkHttpFutureCallback.java:35)
	at okhttp3.internal.connection.RealCall$AsyncCall.run(RealCall.kt:531)