feat: add plugin schema to .aidevops.json and document plugin system (t136.1)

[marcusquinn]

Summary

• Add plugins: [] array to .aidevops.json config created by aidevops init
• Add plugin section to aidevops features listing under "Extensibility"
• Create .agents/aidevops/plugins.md documenting the plugin system

Details

Plugins are third-party git repos that deploy agents into namespaced directories (~/.aidevops/agents/<namespace>/), keeping them isolated from core agents.

Schema per plugin entry:

{
  "name": "pro",
  "repo": "https://github.com/user/aidevops-pro.git",
  "branch": "main",
  "namespace": "pro",
  "enabled": true
}

Documentation covers:

• Plugin schema definition and field descriptions
• Namespacing rules (reserved names, collision prevention)
• Lifecycle: add, update, disable/enable, remove
• Security considerations
• Integration with existing agent tiers (draft, custom, shared)
• Manual management instructions (CLI planned for t136.2+)

Task

Closes subtask t136.1 from backlog-08 batch.

Testing

• ShellCheck: zero violations on aidevops.sh
• Bash syntax: verified OK
• No runtime changes (schema-only, documentation-only)

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feature/t136-plugin-schema

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[github-actions]

🔍 Code Quality Report

�[0;35m[MONITOR]�[0m Code Review Monitoring Report

�[0;34m[INFO]�[0m Latest Quality Status:
SonarCloud: 0 bugs, 0 vulnerabilities, 47 code smells

�[0;34m[INFO]�[0m Recent monitoring activity:
Mon Feb 9 04:20:31 UTC 2026: Code review monitoring started
Mon Feb 9 04:20:31 UTC 2026: SonarCloud - Bugs: 0, Vulnerabilities: 0, Code Smells: 47

📈 Current Quality Metrics

• BUGS: 0
• CODE SMELLS: 47
• VULNERABILITIES: 0

Generated on: Mon Feb 9 04:20:33 UTC 2026

---

Generated by AI DevOps Framework Code Review Monitoring

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud