🐛 Fix Claude plugin agents manifest schema

[ebigunso]

Summary

• Change the Claude Code plugin manifest agents field from a directory string to an explicit array of agent markdown paths.
• Keep the existing shared skills directory reference unchanged.
• Align current docs and the runtime adapter layout ADR with the Claude manifest shape.

Why

Claude Code validates agents as an array of agent files. The previous manifest used "./claude/agents/", which caused plugin installation schema validation to fail. The docs also still described the older directory-based shape.

Validation

• python scripts/validate_harness_package.py
• git diff --check

[Copilot]

Pull request overview

Updates the Claude Code plugin manifest schema for the coding-agent orchestration harness so that Claude Code accepts the plugin during installation.

Changes:

• Changed .claude-plugin/plugin.json agents from a directory string to an explicit array of agent markdown file paths.
• Kept the existing skills directory reference unchanged.

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated no new comments.