feat(whatsapp): support newsletter targets in message tool (#73393)

Summary:
- Adds WhatsApp `@newsletter` target normalization, outbound allowFrom bypass, channel session routing, composing-presence suppression, docs/changelog updates, and focused tests.
- Reproducibility: yes. Source inspection on current main shows a `120363401234567890@newsletter` target normalizes to null before outbound send, and the current session route has only direct/group semantics.

ClawSweeper fixups:
- Included follow-up commit: fix(clownfish): address review for ghcrawl-156943-autonomous-smoke (1)
- Included follow-up commit: feat(whatsapp): support newsletter targets in message tool

Validation:
- ClawSweeper review passed for head 9ff3f88202.
- Required merge gates passed before the squash merge.

Prepared head SHA: 9ff3f88202
Review: https://github.com/openclaw/openclaw/pull/73393#issuecomment-4338584612

Co-authored-by: vincentkoc <25068+vincentkoc@users.noreply.github.com>
Co-authored-by: openclaw-clownfish[bot] <280122609+openclaw-clownfish[bot]@users.noreply.github.com>
Co-authored-by: clawsweeper <274271284+clawsweeper[bot]@users.noreply.github.com>

docs/cli/directory.md

@@ -32,7 +32,7 @@ openclaw message send --channel slack --target user:U012ABCDEF --message "hello"
 
 ## ID formats (by channel)
 
-- WhatsApp: `+15551234567` (DM), `1234567890-1234567890@g.us` (group)
+- WhatsApp: `+15551234567` (DM), `1234567890-1234567890@g.us` (group), `120363123456789@newsletter` (Channel/Newsletter outbound target)
 - Telegram: `@username` or numeric chat id; groups are numeric ids
 - Slack: `user:U…` and `channel:C…`
 - Discord: `user:<id>` and `channel:<id>`

docs/cli/message.md

@@ -26,7 +26,7 @@ Channel selection:
 
 Target formats (`--target`):
 
-- WhatsApp: E.164 or group JID
+- WhatsApp: E.164, group JID, or WhatsApp Channel/Newsletter JID (`...@newsletter`)
 - Telegram: chat id or `@username`
 - Discord: `channel:<id>` or `user:<id>` (or `<@id>` mention; raw numeric ids are treated as channels)
 - Google Chat: `spaces/<spaceId>` or `users/<userId>`
@@ -76,7 +76,7 @@ Name lookup:
   - Telegram only: `--thread-id` (forum topic id)
   - Slack only: `--thread-id` (thread timestamp; `--reply-to` uses the same field)
   - Telegram + Discord: `--silent`
-  - WhatsApp only: `--gif-playback`
+  - WhatsApp only: `--gif-playback`; WhatsApp Channels/Newsletters are addressed with their native `@newsletter` JID.
 
 - `poll`
   - Channels: WhatsApp/Telegram/Discord/Matrix/Microsoft Teams