Migrate legacy Salesforce UI stacks onto modern LWC — Aura → LWC conversion completeness verification and Lightning Out Beta → Lightning Out 2.0 host-page migration. TRIGGER on "verify Aura to LWC migration completeness", "migrate Lightning Out Beta to LO 2.0", "upgrade $Lightning.use() to <lightning-out-application>", "replace hardcoded LO tokens with OAuth PKCE", "write an LO 2.0 host page", or an external Lightning Out page that stopped rendering; also `.cmp`/`.js-meta.xml` files alongside LWC. DO NOT TRIGGER for the initial Aura-to-LWC conversion (use experience-aura-lwc-migrate), a React-to-LWC migration, or building a new LWC (use experience-lwc-design-generate).
