refactor: unify reply dispatch across providers

docs/configuration.md

@@ -446,6 +446,9 @@ Controls inbound/outbound prefixes and timestamps.
 }
 ```
 
+`responsePrefix` is applied to **all outbound replies** (tool summaries, block
+streaming, final replies) across providers unless already present.
+
 ### `talk`
 
 Defaults for Talk mode (macOS/iOS/Android). Voice IDs fall back to `ELEVENLABS_VOICE_ID` or `SAG_VOICE_ID` when unset.

docs/heartbeat.md

@@ -22,6 +22,13 @@ If the model accidentally includes `HEARTBEAT_OK` at the start or end of a
 normal (non-heartbeat) reply, Clawdbot strips the token and logs a verbose
 message. If the reply is only `HEARTBEAT_OK`, it is dropped.
 
+### Outbound normalization (all providers)
+For **all providers** (WhatsApp/Web, Telegram, Slack, Discord, Signal, iMessage),
+Clawdbot applies the same filtering to tool summaries, streaming block replies,
+and final replies:
+- drop payloads that are only `HEARTBEAT_OK` with no media
+- strip `HEARTBEAT_OK` at the edges when mixed with other text
+
 ## Config
 
 ```json5