Epic G: Developer Experience

[fsecada01]

Epic G — Developer Experience · Milestone: 0.8.0b / 1.0.0 · See claudedocs/dev_plan_production_grade_2026-06-24.md

• H1 Declarative optimistic-JS command DSL (show/hide/toggle/transition) (needs B1)
• H2 JS interop hooks w/ lifecycle + auto-reattach after swap (needs B1)
• H3 Latency simulation for dev
• H4 Devtools / inspector (state/events/connections) (→1.0)
• H5 Offline detection + visibility-throttled polling
• H6 Composition primitives gap: docs/README claim SlotComponent/CompositeComponent exist (Beta feature list) but only fill_slot()/render_slots()/compose() are implemented — reconcile docs with reality or build the missing primitives (surfaced while writing Docs: multi-step wizard recipe + example for the FastAPI adapter #29)