Fix marketplace.json plugin source path ("." -> "./")

[ronpandolfi]

The plugin source in .claude-plugin/marketplace.json is set to a bare ".". Claude Code's marketplace parser only recognizes relative paths starting with ./ or ../, absolute paths, or the owner/repo shorthand, so a bare . is rejected.

/plugin install gpcam@gpcam then fails with:

This plugin uses a source type your Claude Code version does not support. Update Claude Code and try again.

which is misleading — it reproduces on the latest Claude Code (2.1.162), and "updating" cannot fix it. Other working marketplaces use "./".

Fix: "source": "." → "source": "./". One character; resolves the plugin at the marketplace repo root and lets the install succeed.

Verified locally by patching the cached marketplace clone and re-running /plugin install gpcam@gpcam.

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.59%. Comparing base (4e03b4c) to head (1d35a72).

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #52   +/-   ##
=======================================
  Coverage   87.59%   87.59%           
=======================================
  Files           9        9           
  Lines         637      637           
=======================================
  Hits          558      558           
  Misses         79       79           

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