v0.4.6

Release checklist: the .mcpb bundle attached below must be manually resubmitted to the Anthropic extension directory — the published extension does not update itself (#19, #57).

What's Changed

• fix: reject empty shortcut key segments by @git-ksk in #65
• fix: serialize launchd plist safely by @git-ksk in #64
• fix: handle screenshot tempfile exhaustion by @git-ksk in #62
• fix: allow bounded HTTP graceful shutdown by @git-ksk in #66

Full Changelog: v0.4.0...v0.4.6