fix(marketplace): sync marketplace.json version with the plugin manifest

[Platonenkov]

.claude-plugin/marketplace.json still advertised 0.2.1 while plugins/code-index/.claude-plugin/plugin.json had moved to 0.2.2 and now 0.2.3. Two manifests describing the same plugin disagreed by two releases — the marketplace is what a client reads to decide whether a newer version exists, so a bump that never reaches it is a release users are not offered.

Both fields (marketplace metadata.version and the plugin entry's version) now read 0.2.3, matching the plugin manifest that ships serverVersion 0.2.1.

Worth a follow-up: nothing enforces that these two files agree, and they have already drifted once silently. A one-line check in CI comparing them would have caught it.

[coderabbitai]

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