Bump plugin and marketplace version to 2.0.7

[Iron-Ham]

Summary

Patch release packaging the orphan-cleanup fix from #42.

• Bumps .claude-plugin/plugin.json and .claude-plugin/marketplace.json from 2.0.6 → 2.0.7.

Release contents

• fix: cascade-delete all orphaned objects in PreviewHost cleanup #42 — fix: cascade-delete all orphaned objects in PreviewHost cleanup. Earlier cleanups only removed the first matching PreviewHost native target and a single root-group child, leaking XCBuildConfiguration + XCConfigurationList, the PBXSourcesBuildPhase / PBXFrameworksBuildPhase / PBXResourcesBuildPhase and their PBXBuildFile entries, PBXTargetDependency + PBXContainerItemProxy, forwarded XCSwiftPackageProductDependency stubs, and the PreviewHost.app PBXFileReference (including its slot in the Products group). Because each leak left another PreviewHost target behind, the next run's .first(where:) only peeled one off and the leak compounded — user pbxproj files accumulated hundreds of lines of cruft and broken refs to deleted .preview-host-XXXXX/ temp dirs. Cleanup now iterates over all PreviewHost targets, cascade-deletes their build phases / build files / config lists / dependencies / package product deps / product refs, recursively scrubs every PreviewHost PBXGroup, and removes any orphan PreviewHost.app refs left by prior broken cleanups. Regression test runs inject + cleanup three times and asserts nothing survives.

Test plan

• Both version files updated to 2.0.7
• Diff limited to the two version fields
• CI green