Add ML Pipeline to Development & Workflow

[jananthan30]

Plugin

ML Pipeline — enforces a strict 16-step, data-first ML workflow (data inspection → EDA → problem definition → cleaning → engineering → split → features → preprocessing → baseline → training → tuning → evaluation → error analysis → final test → deployment → monitoring) with explicit user-permission gates after each phase, marimo notebooks as the workbench, and matplotlib figures at every data-facing step.

Scanner requirements

• HOL Plugin Scanner runs in the repo's GitHub Actions: workflow — latest run on main is green
• Local preflight: policy_pass=True, effective_score=90 (≥ 80), no critical or high findings
• Codex plugin manifest at .codex-plugin/plugin.json, repo marketplace at .agents/plugins/marketplace.json; install verified end-to-end with codex plugin marketplace add + codex plugin add

Entry

Added alphabetically to Community Plugins → Development & Workflow.

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