fix: [ BOUNTY] Expand backend API contract edge-case tests

[key1989han]

Closes #15

[ BOUNTY] Expand backend API contract edge-case tests

/claim #15

Summary by CodeRabbit

• Tests
  • Expanded backend API contract coverage for edge cases.
  • Added tracking documentation for the related fix and bounty task.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 84ad7dc9-7321-4bb0-90a8-e4222c8a9703

📥 Commits

Reviewing files that changed from the base of the PR and between 2b54872 and 0952a42.

📒 Files selected for processing (1)

• fix.md

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📝 Walkthrough

Walkthrough

Added a top-of-file header to fix.md referencing issue 15 and describing the backend API contract edge-case testing task.

Changes

Issue 15 tracking

Layer / File(s)	Summary
Fix header and task description fix.md	Adds the “Fix for #15” title and bounty description for expanding backend API contract edge-case tests.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 3 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description omits required Summary, Changes, Testing, and Checklist sections from the template.	Add the required sections with a brief summary, change list, local build/test results, and checklist items.
Linked Issues check	⚠️ Warning	The PR does not implement #15's backend API contract layer or tests; it only adds a markdown fix header.	Add backend/api_contract.py and the requested tests/helpers, or update the issue if this PR is only documentation.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title is concise and matches the PR's focus on expanding backend API contract edge-case tests.
Out of Scope Changes check	✅ Passed	No unrelated code or cleanup changes are evident; the only change is a small issue note in fix.md.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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