Two bugs made local (Ollama) models unable to use email tools, leaving
raw fences like ```list_email_accounts {}``` in the chat:
1. _TOOL_BLOCK_RE required a newline right after the fence tag, so a
tool call with args on the same line ("```list_email_accounts {}")
never matched and was never executed. The fence now matches with
optional spaces/newline after the tag.
2. Even when parsed, bare email tool names had no dispatch branch in
tool_execution.py and fell through to "Unknown tool type". They now
route to the email MCP server as mcp__email__<name>, matching how
function_call_to_tool_block already maps them for native callers.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
