fix(spec): correct Jotai provider claim - provider-less by default

Jotai uses provider-less mode by default since v2. Provider is only
needed for SSR, subtree isolation, or custom initial values.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: olaservo

specification/v2_storage.md

@@ -108,7 +108,6 @@ See [v2_tech_stack.md](./v2_tech_stack.md#pino-rationale) for Pino configuration
 
 **Cons:**
 - Less intuitive for imperative state updates
-- Requires Provider at React root
 - Smaller ecosystem than Zustand
 
 **Verdict:** Good alternative, but less proven in MCP tooling context