fix(gitlab): accept project lookup metadata

[eshurakov]

Summary

Allow GitLab project lookup responses to include standard metadata while continuing to require a valid positive project ID.

Add regression coverage for a representative GitLab project response.

Verification

• Manual testing not run; this is a non-UI resolver change covered by focused automated checks.

Visual Changes

N/A

Reviewer Notes

The identity parser now ignores non-identity response fields rather than rejecting the entire GitLab API response.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Executive Summary

Reviewed the GitLab project identity schema relaxation and its test update; the change correctly loosens .strict() while still validating id as a positive integer, with no security, correctness, or reliability issues found.

Files Reviewed (2 files)

• services/git-token-service/src/gitlab-runtime-token-resolver.ts
• services/git-token-service/src/index.test.ts

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_{Review guidance: REVIEW.md from base branch main}