feature-flags

Adds, updates, or removes a LoreKit feature flag end-to-end: the registry.ts entry, codegen regeneration, tests, and — for a flag that changes what renders — the copy-and-suffix UI-variant scaffold (a resolver component plus one whole, standalone component per arm, never inline branches inside one component). Reads packages/feature-flags/CLAUDE.md and docs/feature-flags.md as the source of truth rather than guessing…