feat: add everything-claude-code-conventions ECC bundle (.claude/commands/add-or-update-plugin-marketplace-system.md)

.claude/commands/add-or-update-plugin-marketplace-system.md

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+---
+name: add-or-update-plugin-marketplace-system
+description: Workflow command scaffold for add-or-update-plugin-marketplace-system in everything-claude-code.
+allowed_tools: ["Bash", "Read", "Write", "Grep", "Glob"]
+---
+
+# /add-or-update-plugin-marketplace-system
+
+Use this workflow when working on **add-or-update-plugin-marketplace-system** in `everything-claude-code`.
+
+## Goal
+
+Implements or refines the plugin marketplace system, including registry helpers, CLI scripts, JSON stubs, and documentation.
+
+## Common Files
+
+- `scripts/lib/pluginRegistry.js`
+- `scripts/pluginMarketplace.js`
+- `scripts/pluginInstall.js`
+- `.claude-plugin/marketplaces.json`
+- `.claude-plugin/installed-plugins.json`
+- `tests/lib/pluginRegistry.test.js`
+
+## Suggested Sequence
+
+1. Understand the current state and failure mode before editing.
+2. Make the smallest coherent change that satisfies the workflow goal.
+3. Run the most relevant verification for touched files.
+4. Summarize what changed and what still needs review.
+
+## Typical Commit Signals
+
+- Edit or create scripts/lib/pluginRegistry.js for registry helpers
+- Edit or create scripts/pluginMarketplace.js and/or scripts/pluginInstall.js for CLI commands
+- Edit .claude-plugin/marketplaces.json and/or .claude-plugin/installed-plugins.json as stubs or for schema changes
+- Update or add tests in tests/lib/pluginRegistry.test.js
+- Update or create documentation in commands/plugin-marketplace.md and/or commands/plugin-install.md
+
+## Notes
+
+- Treat this as a scaffold, not a hard-coded script.
+- Update the command if the workflow evolves materially.