Tighten computed projection typing

[patroza]

Summary

• Tighten projectComputed typing so projection schemas must match encoded repo fields and computed output types.
• Add typed computed projection outputs for relation helpers like count, any, collect, and collectFields.
• Support union projection schemas by collecting keys from every encoded object variant, including computed keys present on only one variant.
• Keep runtime validation for missing or extra computed keys, with invalid construction sites now locked by @ts-expect-error.

Testing

• pnpm lint-fix
• pnpm check

[pkg-pr-new]

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@effect-app/cli

npm i https://pkg.pr.new/effect-app/libs/@effect-app/cli@817

effect-app

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@effect-app/eslint-codegen-model

npm i https://pkg.pr.new/effect-app/libs/@effect-app/eslint-codegen-model@817

@effect-app/eslint-shared-config

npm i https://pkg.pr.new/effect-app/libs/@effect-app/eslint-shared-config@817

@effect-app/infra

npm i https://pkg.pr.new/effect-app/libs/@effect-app/infra@817

@effect-app/vue

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@effect-app/vue-components

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commit: 96c83ff