Refactor gateway entry normalization across Claude/Copilot/Gemini converters

[Copilot]

Three gateway config converters in actions/setup/js independently implemented the same clone/mutate/URL-rewrite flow, creating drift risk for future schema or URL handling changes. This PR centralizes that transformation path while keeping provider-specific behavior isolated.

• Shared normalization primitive

  • Added normalizeGatewayEntry(entry, urlPrefix, mutate?) in convert_gateway_config_shared.cjs.
  • Centralizes:
    • shallow clone of the entry
    • optional provider mutation
    • conditional URL rewrite (string URLs only)

• Provider adapters reduced to intent-only mutations

  • convert_gateway_config_claude.cjs: sets type = "http" via mutation callback.
  • convert_gateway_config_copilot.cjs: ensures default tools = ["*"] when missing.
  • convert_gateway_config_gemini.cjs: removes type for transport auto-detection.
  • Removes duplicated per-file clone/rewrite blocks.

• Coverage updates for shared path

  • Extended convert_gateway_config_adapters.test.cjs with a focused test for normalizeGatewayEntry, including immutability and URL rewrite behavior.
  • Existing adapter tests continue to validate provider-specific invariants.

function transformClaudeEntry(entry, urlPrefix) {
  return normalizeGatewayEntry(entry, urlPrefix, (transformed) => {
    transformed.type = "http";
  });
}

[github-actions]

🤖 PR Triage

Field	Value
Category	refactor
Risk	🟡 medium
Priority	medium
Score	40 / 100
Action	📦 batch_review

Score breakdown: impact 20 + urgency 8 + quality 12

Draft PR centralizing gateway config normalization across Claude/Copilot/Gemini converters. Good code-quality improvement with tests. Review alongside similar cross-provider refactors once ready.

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