Refactor duplicated owner/repo/number parsing in REST backend caller

[Copilot]

restBackendCaller.CallTool had duplicated logic for extracting owner, repo, and numeric resource IDs from JSON args in the pull_request_read and issue_read branches. Both paths implemented the same string/float64 fallback behavior, which made future changes easy to miss and encouraged more copy/paste as REST tools expand.

• Shared argument parsing

  • Extracted a local helper in internal/proxy/proxy.go to parse:
    • owner
    • repo
    • numeric identifier fields passed as either string or JSON number
  • Preserved the existing error shape and missing-field validation per tool.

• Call site cleanup

  • Updated pull_request_read to delegate pullNumber parsing to the helper.
  • Updated issue_read to delegate issue_number parsing to the same helper.
  • Kept API path construction unchanged after extraction.

• Focused coverage

  • Added direct unit coverage for the shared helper to exercise:
    • string ID input
    • float64 JSON number input
    • missing/empty argument handling

owner, repo, number, err := extractOwnerRepoNumber(
    argsMap,
    "owner",
    "repo",
    "pullNumber",
    "pull_request_read",
)
if err != nil {
    return nil, err
}
apiPath = fmt.Sprintf("/repos/%s/%s/pulls/%s", owner, repo, number)

[Copilot]

Pull request overview

This PR refactors duplicated REST backend argument parsing for GitHub issue and pull request reads into a shared helper, reducing copy/paste while preserving existing API path behavior and error shapes.

Changes:

• Added extractOwnerRepoNumber to parse owner, repo, and string/JSON-number resource IDs.
• Updated pull_request_read and issue_read branches to use the helper.
• Added focused unit coverage for helper behavior and error formatting.

Show a summary per file

File	Description
internal/proxy/proxy.go	Introduces shared owner/repo/number parsing and applies it to PR and issue read tool calls.
internal/proxy/rest_backend_caller_tool_test.go	Adds table-driven tests for string IDs, float64 IDs, and missing argument errors.

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• Files reviewed: 2/2 changed files
• Comments generated: 0