test(resume-parser): add type compiler coverage (JhaSourav07#3150)

## Description

Fixes JhaSourav07#2882 

Added type-level tests for `lib/resume-parser.ts` focusing on TypeScript
compiler validation, schema stability, and API contract safety.

### Changes
- Added `lib/resume-parser.type-compiler.test.ts`
- Verified `parseResume` returns `Promise<ParsedResume>`
- Tested `parseResume` parameter type contracts (`Buffer`, `string`)
- Confirmed `ParsedResume` structure remains type-safe and stable
- Verified `Education` and `Experience` collections are correctly typed
within parsed results
- Tested `ALLOWED_MIME_TYPES` maintains string array typing
- Confirmed `MAX_FILE_SIZE` remains a numeric constant
- Improved protection against accidental type regressions and API
contract changes

## Pillar

- [ ] 🎨 Pillar 1 — New Theme Design
- [ ] 📐 Pillar 2 — Geometric SVG Improvement
- [ ] 🕐 Pillar 3 — Timezone Logic Optimization
- [x] 🛠️ Other (Bug fix, refactoring, docs)

## Visual Preview

N/A (test-only changes)

## Checklist before requesting a review:

- [x] I have read the `CONTRIBUTING.md` file.
- [x] I have tested these changes locally.
- [x] I have run `npm run format` and `npm run lint` locally and
resolved all errors (CI will fail otherwise).
- [x] My commits follow the Conventional Commits format (e.g.,
`feat(themes): ...`, `fix(calculate): ...`).
- [ ] I have updated `README.md` if I added a new theme or URL
parameter.
- [x] I have starred the repo.
- [x] I have made sure that I have only one commit to merge in this PR.
- [x] The SVG output matches the CommitPulse "premium quality" aesthetic
standard (no visual changes made).
- [ ] (Recommended) I joined the CommitPulse Discord community for
contributor discussions, mentorship, and faster PR support.

Author: JhaSourav07

lib/resume-parser.type-compiler.test.ts

@@ -0,0 +1,35 @@
+// lib/resume-parser.type-compiler.test.ts
+
+import { describe, expectTypeOf, it } from 'vitest';
+import { parseResume, ALLOWED_MIME_TYPES, MAX_FILE_SIZE } from './resume-parser';
+
+import type { ParsedResume, Education, Experience } from '@/types/student';
+
+describe('Resume Parser Type Compiler Validation', () => {
+  it('returns a Promise of ParsedResume', () => {
+    expectTypeOf(parseResume).returns.toEqualTypeOf<Promise<ParsedResume>>();
+  });
+
+  it('accepts expected parseResume parameter types', () => {
+    expectTypeOf(parseResume).parameters.toEqualTypeOf<[Buffer, string]>();
+  });
+
+  it('validates ParsedResume structure', () => {
+    expectTypeOf<ParsedResume>().toMatchTypeOf({
+      name: '',
+      email: '',
+      phone: '',
+      skills: [] as string[],
+      education: [] as Education[],
+      experience: [] as Experience[],
+    });
+  });
+
+  it('enforces allowed mime types array typing', () => {
+    expectTypeOf(ALLOWED_MIME_TYPES).toEqualTypeOf<string[]>();
+  });
+
+  it('enforces MAX_FILE_SIZE numeric typing', () => {
+    expectTypeOf(MAX_FILE_SIZE).toEqualTypeOf<number>();
+  });
+});