Fix marketplace.json source format for Claude Code install

[rushikeshmore]

Summary

Fixes #10. /plugin install shopify-plugin@shopify-ai-toolkit currently fails with Invalid input on plugins[0].source because marketplace.json sets source to the bare string "./", which is not a valid shape per the Claude Code plugin marketplace schema.

Per the official plugin-marketplaces docs, a plugin source must be either:

• a relative path string that points to a plugin subdirectory (e.g. "./plugins/my-plugin"), or
• an object with one of github, url, git-subdir, or npm.

Since plugin.json and .claude-plugin/ already live at the repo root here, the simplest fix that avoids any layout change is the github source form. That's also the variant used by most entries in the official anthropics/claude-plugins-official marketplace.

Change

.claude-plugin/marketplace.json:

-      "source": "./",
+      "source": {
+        "source": "github",
+        "repo": "Shopify/Shopify-AI-Toolkit"
+      },

No plugin contents moved. No other files touched.

Note: I deliberately did not adopt the {"source": "local", "path": "./"} shape suggested in the issue body — "local" is not one of the source types in the current schema, so that would still fail validation. The github form is documented and covers this case.

Verification

• claude plugin validate . → ✔ Validation passed on this branch (fails on main).
• After this lands, the install flow from the issue (/plugin marketplace add Shopify/Shopify-AI-Toolkit then /plugin install shopify-plugin@shopify-ai-toolkit) should complete without schema errors, since the marketplace catalog now points Claude Code at the same repo to fetch the plugin contents.

Test plan

• claude plugin validate . passes
• /plugin marketplace add Shopify/Shopify-AI-Toolkit succeeds
• /plugin install shopify-plugin@shopify-ai-toolkit succeeds on Claude Code v2.x
• Installed plugin exposes the 16 skills under skills/

[github-actions]

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