chore: add detect-secrets baseline

[Coding-Dev-Tools]

Adds a .secrets.baseline (detect-secrets v1.5.0) so the credential scan in CI has a baseline to diff against.

Description

Please include a summary of the change and which issue is fixed.

Fixes # (issue)

Type of Change

• Bug fix (non-breaking change fixing an issue)
• New feature (non-breaking change adding functionality)
• Breaking change (fix or feature that breaks existing behavior)
• Documentation update
• Dependency update

How Has This Been Tested?

• pytest passes locally
• Manual test with sample data

Checklist

• My code follows the project's style guidelines
• I have added tests that prove my fix/feature works
• All new and existing tests pass
• I have updated the documentation accordingly
• I have added a CHANGELOG entry

[github-actions]

🤖 Automated Code Review

⚠️ Ruff Lint — 1 issue(s)

::error title=ruff (W292),file=/home/runner/work/api-contract-guardian/api-contract-guardian/tests/test_migration.py,line=282,col=50,endLine=282,endColumn=50::tests/test_migration.py:282:50: W292 No newline at end of file%0A  help: Add trailing newline

⚠️ Ruff Format — Formatting needed

Would reformat: src/api_contract_guardian/cli.py
Would reformat: src/api_contract_guardian/diff.py
Would reformat: src/api_contract_guardian/gate.py
Would reformat: src/api_contract_guardian/loader.py
Would reformat: src/api_contract_guardian/migration.py
Would reformat: tests/conftest.py
Would reformat: tests/test_cli.py
Would reformat: tests/test_diff.py
Would reformat: tests/test_migration.py
9 files would be reformatted, 6 files already formatted

🔴 Secret Detection — 1 potential secret(s)

  .ruff_cache/CACHEDIR.TAG:1 — Hex High Entropy String

✅ Large Files — Within limits

📊 Diff Stats — 1 file(s) changed

 .secrets.baseline | 136 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 136 insertions(+)

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Verdict: 🔴 Changes Requested — Potential secrets detected. Do not merge.

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