v0.3.0

Changelog

• cc37dd4: Add SPDX license headers to the Go source (#25) (@nopcoder)
• 0afc70d: Add gv put and delete several documents in one call (#15) (@nopcoder)
• a27febe: Add gv skills to install an agent skill for Claude Code and Codex (#23) (@nopcoder)
• 4a82146: Remove the public wording check script (#24) (@nopcoder)