fix: rehydrate Svelte on state change and run UI checks through the instance

[martijn00]

Summary

• stacks on #70; review the last commit(s) once fix: reject prototype paths, fail closed on deny, and run unit tests in CI #70 merges
• UI check() uses overlay rules only while the instance is not ready, then goes through instance.check() so hooks and Standard Schema validate: 'deny' run
• Svelte PermixHydrate rehydrates when state changes; Vue Check caches a computed boolean
• README, getting started, and CONTRIBUTING document that core setup() is not request-safe, and that pnpm verify:full includes Playwright
• overlapping setup() last-write-wins is characterized until immutable instances land

Test plan

• pnpm exec vitest run src/core src/react src/vue src/solid src/svelte src/standard-schema
• pnpm test
• pnpm run check-types
• pnpm run lint
• pnpm --filter permix size:compare

Checklist

• docs updated (docs/content/docs/index.mdx, README.md, CONTRIBUTING.md)
• permix/skills/ aligned for the request-safety note
• added tests for Svelte rehydrate, UI check hooks, Standard Schema deny hooks, and concurrent setup() last-write-wins

Made with Cursor

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