Add EDC repo-context tool

[almogdepaz]

Description

Adds EDC to the Configuration & Context Management section.

EDC is a developer-focused AI coding-agent tool that generates local repo context under edc-context/ and uses it during review/debug workflows for Claude Code, Cursor, Codex, and pi.

Checklist

• The entry is a tool that uses AI
• The entry is a developer-focused tool
• The description is unambiguous and clear
• The description matches the style of other entries

[github-actions]

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