[High Priority] Add dedicated ESLint CI workflow

[Mossaka]

Context

From CI/CD Pipeline Gap Assessment (Discussion #227)

Description

Create a dedicated workflow for ESLint enforcement to ensure code quality standards are met on all PRs.

Acceptance Criteria

• Create new lint workflow file
• Configure ESLint to run on all TypeScript files
• Make workflow required for PR merges
• Ensure fast feedback (target < 1 minute)

Estimated Effort

Approximately 2 hours

Related

• Discussion CI/CD Pipeline and Integration Tests - Gap Assessment #227