sx v2.2.0

Changelog

• 202ecf3 SK-646: Add Skill Doctor dedupe spec
• 8dc8475 SK-646: Add sx.llm core LLM service
• b19751a SK-646: Add sx.ui.openSettings deep link
• fa37152 SK-646: Fail-closed scratch dir, header API key
• 545daf3 SK-646: Harden CLI providers, validate schemas
• 6338870 SK-646: Real-CLI integration tests, output bounds
• bceac2e SK-647: Consolidate/merge actions, AI sweep
• 018c1af SK-647: Duplicate detector UX, TTL cache, TOOLS
• 6ed5ddd SK-647: Fail closed on missing assets in consolidate
• 5c9e3ff SK-647: Harden adjudication prompt, scan guards
• 9a94557 SK-647: Keep sources whose reach was refused
• 5536255 SK-647: Persisted cache is the only fast path
• 8670fe4 SK-647: Skill Doctor detection built-in