feat(createFormSchema): schema-driven form generation for issue #244

[sridhar-3009]

Summary

Closes #244.

Adds createFormSchema — a composable that sits on top of createForm and createValidation and accepts a typed field-definition object. Returns reactive value refs, per-field v-model bindings, and form-level helpers so consumers can drive a form from a schema without wiring up individual createValidation calls by hand.

API at a glance

const schema = createFormSchema({
  username: {
    default: '',
    rules: ['required', v => String(v).length >= 3 || 'Min 3 characters'],
  },
  email: {
    default: '',
    rules: ['required', 'email'],
  },
})

// Spread onto any input component:
// <TextField v-bind="schema.fields.username" />

const ok = await schema.submit() // validates all fields
schema.reset()                   // restores defaults + clears errors

Each fields.<name> object exposes:

• modelValue — current value (reactive getter)
• onUpdate:modelValue — value setter
• errorMessages — ShallowRef<string[]> for displaying validation errors

Design notes

• UI-agnostic — no dependency on any component library; works with plain <input>, Paper components, or anything else.
• Typed — schema.values.<name> is typed to the default type you provide.
• Delegating — isValid, isValidating, and submit delegate directly to the underlying FormContext.
• Accepts all rule formats supported by createValidation: functions, string aliases, and standard schemas (Zod, Valibot, ArkType).

Test plan

• packages/0/src/composables/createFormSchema/index.test.ts — 12 unit tests covering initial state, field bindings, submit/validation (pass, fail, multi-field, multi-rule), and reset.
• pnpm typecheck passes
• pnpm test:run passes (all 6257 tests)
• pnpm repo:check (knip + sherif) passes

[pkg-pr-new]

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commit: fba7633

[sridhar-3009]

Superseded by #447 which cherry-picks the same change onto a clean branch with all lint errors fixed.