When a proxied Anthropic-Messages endpoint degrades a native tool_use block
into plain text, the assistant emits antml:namespaced XML tags
(<antml:invoke>, <antml:parameter>). These were not recognized by the
visible-text sanitizer, leaking tool-call XML into user-visible replies.
Added antml: (and mm:) namespace handling to:
- TOOL_CALL_QUICK_RE regex for fast pre-check
- TOOL_CALL_TAG_NAMES set for tag name recognition
- Tag name scanner to accept ':' in tag names
- TOOL_CALL_XML_PAYLOAD_START_RE for XML payload detection
- shouldDetectXmlPayload to include antml:invoke tags
Fixes#97750.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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