chore: add Claude Code AI tooling configuration (.claude agents, skills, settings)

[pallakartheekreddy]

Summary

• Add three Claude Code agent definitions under .claude/agents/: build-validator, review, and scala-dev-architect
• Add five developer workflow skills under .claude/skills/: commit, design, plan, review, and test
• Add .claude/settings.json with permission configuration for the Claude Code CLI

These files configure the Claude Code CLI (claude.ai/code) for developers working on this repository, providing standardized AI-assisted workflows for diagnostics, code review, design, and testing.

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

This change adds only AI tooling configuration files (.claude/). No production code is modified.

• Verified agent definitions load correctly in Claude Code CLI
• Verified skills are invocable via /commit, /review, /plan, /design, /test

Test Configuration:

• Claude Code CLI v1.x
• No application code changed — no build or runtime impact

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

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