docs: remove XML tool calling references from openai-compatible page

[roomote]

Removes outdated XML tool calling references from the OpenAI Compatible provider docs page.

Changes

XML tool calling was removed in v3.42.0 (PR #10841) and remaining code paths cleaned up in v3.43.0 (PR #10929). The docs/providers/openai-compatible.md page still referenced XML as a fallback and mentioned a "tool protocol selector" setting that no longer exists.

This PR updates the page to:

• Remove all references to "XML-based tool format" as a fallback protocol
• Remove the claim that Roo Code "falls back to XML" when conditions are not met
• Remove the mention of a "Tool protocol selector" in advanced settings
• Clarify that native tool calling is the only supported protocol
• Add a warning admonition that models without native tool calling cannot be used with Roo Code
• Add a troubleshooting entry for tool-calling errors

Resolves EXT-802

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View task on Roo Code Cloud

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Important

Removes outdated XML tool calling references from openai-compatible.md, clarifying exclusive use of native tool calling.

• Behavior:
  • Removes all references to "XML-based tool format" and claims of fallback to XML in openai-compatible.md.
  • Clarifies that native tool calling is the only supported protocol.
  • Adds a warning that models without native tool calling cannot be used with Roo Code.
  • Adds a troubleshooting entry for tool-calling errors.
• Misc:
  • Removes mention of "Tool protocol selector" in advanced settings.

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Project	Deployment	Actions	Updated (UTC)
roo-code-docs	Ready	Preview, Comment	Feb 9, 2026 8:47pm

[roomote]

Rooviewer   See task

No issues found. The changes accurately remove outdated XML tool calling references and correctly document native tool calling as the only supported protocol.

_{Mention @roomote in a comment to request specific changes to this pull request or fix all unresolved issues.}