Fix stale list_tokens reference in primer_coding_guidelines tool text

[Copilot]

The primer_coding_guidelines tool still instructed callers to use list_tokens, which was removed in #7574 and replaced with find_tokens, get_design_token_specs, and get_token_group_bundle.

Changelog

Changed

• primer_coding_guidelines tool text: replaced list_tokens reference with the three replacement token tools, each with a brief description of its purpose:
  • find_tokens — search by keyword or group
  • get_design_token_specs — browse available token groups
  • get_token_group_bundle — retrieve all tokens within a specific group

New

Removed

Rollout strategy

• Patch release
• Minor release
• Major release; if selected, include a written rollout or migration plan
• None; documentation-only change to MCP server tool text, no public API impact

Testing & Reviewing

Verify the primer_coding_guidelines tool response no longer references list_tokens and correctly points to the three token tools introduced in #7574.

Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews (Storybook)
• Changes are SSR compatible
• Tested in Chrome
• Tested in Firefox
• Tested in Safari
• Tested in Edge
• (GitHub staff only) Integration tests pass at github/github-ui (Learn more about how to run integration tests)

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