chore: release v1.3.9

[Jamkris]

Bump version to 1.3.9

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Summary by cubic

Release v1.3.9 by bumping the version from 1.3.8 to 1.3.9 across manifests to keep the plugin and extension aligned. Updated package.json, .gemini-plugin/plugin.json, and gemini-extension.json.

^{Written for commit 8590daa. Summary will update on new commits.}

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