Three changes that address the poor WhatsApp experience reported by users:
1. Reclassify WhatsApp from TIER_LOW to TIER_MEDIUM in display_config.py
— enables streaming and tool progress via the existing Baileys /edit
bridge endpoint. Users now see progressive responses instead of
minutes of silence followed by a wall of text.
2. Lower MAX_MESSAGE_LENGTH from 65536 to 4096 and add proper chunking
— send() now calls format_message() and truncate_message() before
sending, then loops through chunks with a small delay between them.
The base class truncate_message() already handles code block boundary
detection (closes/reopens fences at chunk boundaries). reply_to is
only set on the first chunk.
3. Override format_message() with WhatsApp-specific markdown conversion
— converts **bold** to *bold*, ~~strike~~ to ~strike~, headers to
bold text, and [links](url) to text (url). Code blocks and inline
code are protected from conversion via placeholder substitution.
Together these fix the two user complaints:
- 'sends the whole code all the time' → now chunked at 4K with proper
formatting
- 'terminal gets interrupted and gets cooked' → streaming + tool progress
give visual feedback so users don't accidentally interrupt with
follow-up messages
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