Import ClientFlow production v4928.1.5.132.4

RELEASE_NOTES_v4928_1_5_21.md

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+# v4928.1.5.21 — Chatwoot message formatting hotfix
+
+## Fix
+
+- Preserve operator-written line breaks when sending public messages to Chatwoot.
+- Chatwoot renders message content as Markdown-like text, where single newlines can be collapsed into spaces.
+- ClientFlow now formats outgoing Chatwoot messages with Markdown hard breaks before posting, so price lists and manually separated lines remain readable after sending.
+
+## Scope
+
+- Applies to public Chatwoot sends through:
+  - `send_public_message`
+  - `send_public_message_with_attachments`
+- Does not change the editable draft shown to the operator.
+- Does not alter the saved communication body in ClientFlow; the formatting is applied at the Chatwoot delivery boundary.
+
+## Validation
+
+- `python -m compileall -q app`
+- `python -m pytest -q`
+- Added tests for price-list line break preservation.