refactor: update project infrastructure to standard Prismic TypeScript template

[angeloashmore]

Resolves:

Description

Replaces the entire build/test/lint/format/CI toolchain with the standard Prismic TypeScript template infrastructure. This aligns apollo-link-prismic with other Prismic packages for consistency and modern tooling.

Replaced:

• Build: siroc → tsdown (dual ESM/CJS, sourcemaps, unbundled)
• Test: AVA + nyc + sinon → Vitest + @vitest/coverage-v8
• Lint: ESLint → oxlint
• Format: Prettier → oxfmt
• Release: standard-version → release-please (via GitHub Actions)
• CI: Single ci.yml → validate.yml (lint, build, test on Node 20/22/24, types on TS 5.4–5.9) + publish.yml (release-please, canary, PR prereleases)
• TypeScript: 4.x → 6.x, moduleResolution "node" → "bundler"
• Node: >=12.7.0 → >=20

Checklist

• A comprehensive Linear ticket, providing sufficient context and details to facilitate the review of the PR, is linked to the PR.
• If my changes require tests, I added them.
• If my changes affect backward compatibility, it has been discussed.
• If my changes require an update to the CONTRIBUTING.md guide, I updated it.

Preview

How to QA ¹

npm run test  # runs lint + types + unit + build

All 6 tests pass with 100% coverage.

🤖 Generated with Claude Code

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Note

Medium Risk
Replaces core project tooling (lint/format/test/build/CI/release), which is operationally impactful and may surface new build/test/publish failures despite minimal runtime code changes.

Overview
Updates the repository’s infrastructure to match the standard Prismic TypeScript template: replaces ESLint/Prettier with oxlint/oxfmt, AVA with vitest, and the build pipeline with tsdown (via new tsdown.config.ts, vitest.config.ts, updated tsconfig.json, and new npm scripts/devDependencies).

Reworks GitHub Actions by removing the legacy ci.yml and adding validate.yml (lint/build/unit on Node 20/22/24 plus type-check across multiple TypeScript versions) and publish.yml (Release Please-driven releases, plus automated canary and per-PR prereleases with cleanup).

Cleans up and modernizes repo metadata/docs by deleting old config/template files, tweaking .gitignore, updating CONTRIBUTING.md, and applying formatting-only changes to README.md/CHANGELOG.md.

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