Add x-ms-usermessage header to MCP tools/call requests

[akashjindal123]

Summary

• Adds x-ms-usermessage HTTP header to MCP tools/call requests, passing the user's original message to MCP servers during tool execution
• Implements ASCII-safe sanitization in Utility.sanitizeTextForHeader(), matching the .NET HttpContextHeadersHandler.SanitizeTextForHeader() implementation (diacritics removal, smart punctuation conversion, non-breaking space normalization, whitespace collapsing)
• Centralized in Utility.GetToolRequestHeaders() — zero changes needed in Claude, OpenAI, or LangChain extension packages

Test plan

• pnpm build — clean compilation across all packages
• pnpm test — all 1061 tests pass (56 suites)
• New tests cover: header presence/absence, diacritics stripping, smart quote conversion, non-ASCII replacement, whitespace collapsing, coexistence with other headers

🤖 Generated with Claude Code

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