test(github): add lib massive-scaling performance calculations tests

[pari-dubey1]

Description

Fixes #4392

Deploys a production-grade, entirely deterministic, high-volume performance testing suite located at lib/github.massive-scaling.test.ts. This matrix stresses the core analytical algorithms and mathematical boundary clampers inside the GitHub API middle-tier utility using extensive data arrays and extreme parameters without relying on flaky clocks, random variables, or artificial DOM assertions.

Summary of Test Case Coverages:

1. Developer Score Scale Caps (computeDeveloperScore): Feeds an astronomical metrics payload (millions of stars/contributions) to verify that the scoring engine safely clamps at its roof threshold of 100 without suffering integer wrapping or type distortion.
2. Repository Language Aggregation (aggregateLanguages): Simulates a profile tracking 50,000 distinct repositories across a recurring collection of languages to validate that the sorting mechanism segments a maximum of the top 5 values while maintaining accurate distribution percentages.
3. Historical Calendar Grid Mapping (buildActivityMap): Transforms a 50-year dataset (including leap days) to thoroughly stress-test the density classification logic. Confirms that item categorization maps perfectly onto the correct visual intensity bounds ($0$ to $4$) across extreme indexing constraints.
4. Timezone Clock Aggregation (buildCommitClock): Inputs a high-bound array of 10,000 localized contribution events to assert that the metric consolidates predictably into the strict 7-day chronological week structure without losing trace nodes.
5. Milestone Achievement Evaluation (generateAchievements): Runs extreme metrics profiles past all ceiling milestones to guarantee that unlocked indicators, threshold limits, and percentage progress parameters handle maximum load safely.

Pillar

• 🎨 Pillar 1 — New Theme Design
• 📐 Pillar 2 — Geometric SVG Improvement
• 🕐 Pillar 3 — Timezone Logic Optimization
• 🛠️ Other (Automated backend performance testing, algorithm edge-case stabilization)

Visual Preview

(N/A: Core calculation engine and data utility matrix automated test coverage).

Checklist before requesting a review:

• I have read the CONTRIBUTING.md file.
• I have tested these changes locally (npx vitest run github.massive-scaling).
• I have run npm run format and npm run lint locally and resolved all errors (CI will fail otherwise).
• My commits follow the Conventional Commits format (e.g., test(github): ...).
• I have updated README.md if I added a new theme or URL parameter.
• I have starred the repo.
• I have made sure that i have only one commit to merge in this PR.
• The SVG output matches the CommitPulse "premium quality" aesthetic standard (no raw elements, smooth animations, correct fonts).
• (Recommended) I joined the CommitPulse Discord community for contributor discussions, mentorship, and faster PR support.

[github-actions]

📦 Next.js Bundle Size Report (Gzipped Sizes)

✨ No significant bundle size changes detected.

📊 Summary of Totals

Category	PR Size	Base Size	Difference
Total JS	3628.47 KB	3628.47 KB	0 B
Total CSS	284.92 KB	284.92 KB	0 B

[Aamod007]

Difficulty: intermediate – Adds massive-scaling performance tests for github lib calculations.

Quality: clean – Performance coverage.

Type: testing – Scaling tests.

Good perf tests!

[github-actions]

🎉 Congratulations @pari-dubey1! Your PR has been successfully merged. 🚀

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