feat: add CODE_OF_CONDUCT.md to community-health and sync

[wcmchenry3-stack]

Context

The org has no Code of Conduct. GitHub surfaces a "missing Code of Conduct" warning in the community standards checklist. This file should be added to community-health/ and synced to all 6 org repos via sync-community-health.yml.

Implementation

1. Create community-health/CODE_OF_CONDUCT.md

Use Contributor Covenant v2.1 — the industry standard, GitHub-recommended CoC. Adapt the enforcement contact to the org's GitHub contact form or security policy email.

Key sections required:

• Our Pledge
• Our Standards (with examples of positive and unacceptable behavior)
• Enforcement Responsibilities
• Scope
• Enforcement
• Enforcement Guidelines (4 tiers: Correction, Warning, Temporary Ban, Permanent Ban)
• Attribution (link to https://www.contributor-covenant.org/version/2/1/code_of_conduct/)

2. Add to sync-community-health.yml FILE_MAP

- src: community-health/CODE_OF_CONDUCT.md
  dst: CODE_OF_CONDUCT.md

Acceptance Criteria

• community-health/CODE_OF_CONDUCT.md created using Contributor Covenant v2.1
• Enforcement contact section uses org-appropriate contact (GitHub security advisory or org owner)
• File passes markdownlint (no trailing spaces, proper heading hierarchy, blank lines around headings)
• FILE_MAP entry added to sync-community-health.yml
• sync-community-health.yml triggered (or manually verified) to confirm CODE_OF_CONDUCT.md would be written to CODE_OF_CONDUCT.md in target repos
• GitHub community standards checklist shows Code of Conduct as complete

Dependencies

None — can be worked in parallel with all other Phase 2 issues.

Part of Epic

#77

[wcmchenry3-stack]

Implemented in PR #99 and #106 (both merged). Closing.