Integrate plugin loader into validate_and_load startup

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Description

Call plugin-loader.cjs during validate_and_load so every MGW command automatically sees registered plugins. Add LOADED_PLUGINS count to the startup banner. Update workflows/state.md to document the plugin loading step.

Acceptance Criteria

• Integrate plugin loader into validate_and_load startup

Milestone Context

Milestone	v6 — Custom Agent Templates & Plugins
Phase	Phase 41: Plugin Architecture & Schema
GSD Route	plan-phase
Phase Position	Phase 1 of 5 in milestone

Milestone Goal

A plugin architecture that lets projects drop a .mgw/plugins/ directory with custom agent templates, triage validators, and lifecycle hooks — all loaded at runtime without patching MGW core.

Phase Goal

Define the plugin manifest schema, plugin discovery mechanism (scan .mgw/plugins/ and ~/.mgw/plugins/), and the runtime loader that validates and registers plugins at startup.

Dependencies

implement-plugin-discovery-and-loader-in-libplugin

Scope Hints

• Estimated route: plan-phase
• Labels: integration

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MGW · work-started · 2026-03-06T03:53:24Z
Milestone: v6 — Custom Agent Templates & Plugins | Phase 41: Plugin Architecture & Schema

Work Started — #193 Integrate plugin loader into validate_and_load startup

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MGW pr-ready · 2026-03-06T04:03:28.145Z
Milestone: v6 — Custom Agent Templates & Plugins | Phase 41: Plugin Architecture & Schema

PR Ready

PR #208 — #208

Integrates lib/plugin-loader.cjs into the MGW startup sequence. A non-fatal IIFE in bin/mgw.cjs calls discoverPlugins(getDefaultPluginDirs(repoRoot)) and buildRegistry() before any command runs. The registry is accessible via getPluginRegistry() from lib/plugin-loader.cjs. The mgw:run startup banner shows a plugin count suffix when plugins are installed.

Testing procedures posted on the PR.
This issue will auto-close when the PR is merged.

Pipeline Summary

Stage	Status
Triage	done
Planning	done
Execution	done
PR Creation	done