feat: implement Developer Commit Activity Adapter (#22)

[annukumar123]

🔎 Overview

This PR implements the requested Developer Commit Activity Adapter under issue #22. It provides structured ingestion capabilities to map third-party git commit frames directly into standard Context Contribution Protocol (CCP) observations.

🛠️ Changes Implemented

• Commit Log Parsing Ingestion Layer: Created src/adapters/commit-adapter.mjs featuring robust regex taxonomy pattern analysis maps that extract tech-stacks and classify signals into appropriate work domains.
• Payload Normalization: Fully supports standard git log strings as well as rich webhook payloads (extracting author details, commit hashes, and timestamps).
• Module Exports: Added the parser interface directly to the bundle index exports inside src/index.mjs.
• Targeted Validation: Implemented zero-dependency unit checks verifying standard extraction and boundary handling inside test/commit-adapter.test.mjs.

Fixes #22

[annukumar123]

@keepsloading
It is perfect . you can verify now