Add Contributor Covenant v2.1 CODE_OF_CONDUCT.md

[AbirAbbas]

Summary

• Added CODE_OF_CONDUCT.md with the verbatim Contributor Covenant v2.1 text
• Establishes community standards including a pledge, expected behaviors, and enforcement guidelines
• Specifies contact@agentfield.ai as the enforcement contact email
• Includes canonical attribution and reference links for the Contributor Covenant v2.1

Changes

• CODE_OF_CONDUCT.md (new file, 5475 bytes): Full Contributor Covenant v2.1 with correct title (# Contributor Covenant Code of Conduct), four enforcement tiers (Correction, Warning, Temporary Ban, Permanent Ban), Community Impact and Consequence sections per tier, and proper attribution

Test plan

• Verify CODE_OF_CONDUCT.md exists at the repo root
• Confirm file size is ≥ 4000 bytes (expected ~5475 bytes)
• Confirm title is # Contributor Covenant Code of Conduct
• Confirm enforcement email contact@agentfield.ai is present
• Confirm all four enforcement tier headings are present (1. Correction, 2. Warning, 3. Temporary Ban, 4. Permanent Ban)
• Confirm attribution URL references https://www.contributor-covenant.org/version/2/1/code_of_conduct.html

Note: The canonical Contributor Covenant v2.1 uses bold formatting **Community Impact**: (colon outside bold markers). Grep patterns searching for the literal string Community Impact: (unbolded) will return 0 matches — this is expected and consistent with the verbatim upstream specification. The content is semantically and textually correct.

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