feat(examples,tests): nest by adapter and add an Arazzo example

[stijnvanhulle]

🎯 Changes

Kubb now supports two adapters, OpenAPI and Arazzo (kubb-labs/kubb#3927). This PR adds the second layer examples/ and tests/ need to say which adapter a project targets, and adds a working Arazzo example to test the new adapter against the plugin ecosystem.

• Move every existing project from examples/<name> to examples/openapi/<name>, and from tests/3.0.x, tests/e2e, tests/performance to tests/openapi/<name>.
• Add examples/arazzo/typescript, a runnable example that generates TypeScript types from an Arazzo workflow document with plugin-ts.
• Add tests/arazzo/1.1.0, an integration test suite for the same combination.
• Update pnpm-workspace.yaml, root package.json scripts, .github/workflows/pr.yml, README.md, and CONTRIBUTING.md for the new nesting.
• Add @kubb/adapter-arazzo to the pnpm catalog.

Blocked on kubb-labs/kubb#3927

@kubb/adapter-arazzo isn't published yet, so pnpm install can't resolve it until that PR merges and releases. Until then, this branch is broken for every pnpm run ... command repo-wide (pnpm's dependency status check runs before any script). Opening as draft for that reason; flip to ready once the package publishes and a fresh pnpm install refreshes the lockfile.

What I tested

I built kubb-labs/kubb#3927's branch from source in a separate worktree and linked it in locally (temporary pnpm-workspace.yaml override, not part of this diff) to validate end to end:

• kubb generate in examples/arazzo/typescript succeeds and produces 6 files from the workflow document.
• The tests/arazzo/1.1.0 vitest suite passes, and the full tests/openapi/3.0.x suite still passes after the move.
• oxfmt and oxlint are clean across the repo.

Two issues surfaced that belong in the kubb repo, not here:

1. Generated output doesn't typecheck. LoginAndReadPetOutputs.ts imports a Pet type that @kubb/adapter-arazzo never emits as a top-level schema, even though the workflow's outputs resolve into it ($steps.readPet.outputs.pet → the OpenAPI source's Pet response schema). tsc fails with Cannot find module './Pet'.
2. @kubb/plugin-ts's own test suite stops typechecking once built against the @kubb/ast version this PR ships. packages/plugin-ts/src/printers/operationParams.test.ts builds override objects typed via Partial<Parameters<typeof createOperation>[0]>; the new 'arazzo' protocol widens that inferred type enough that the merged object no longer satisfies the HTTP-only overload. This isn't specific to using Arazzo — any consumer bumping @kubb/ast/@kubb/core to the version this PR ships hits it.

✅ Checklist

• I have followed the steps in the Contributing guide.
• I have tested this code locally with pnpm run test (against a local build of Adapter arazzo kubb#3927; see above).

🚀 Release Impact

• This change affects published code, and I have generated a changeset.
• This change is for the docs (no release). No packages/* source changed; examples/, tests/, and docs are excluded from changesets in this repo.

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[stijnvanhulle]

CI is red on this commit: Lint and format, Build, and Linting all fail. This isn't a bug in the diff — every one of those jobs runs pnpm install first, and that fails with [ERR_PNPM_FETCH_404] GET https://registry.npmjs.org/@kubb%2Fadapter-arazzo: Not Found, exactly as flagged in the PR description under "Blocked on kubb-labs/kubb#3927".

@kubb/adapter-arazzo isn't published yet, so there's no fix to port here — it resolves itself once kubb-labs/kubb#3927 merges and releases and a fresh pnpm install picks up the real package. No re-run needed since the failure is deterministic, not a flake. Keeping this PR watched until that happens.

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[stijnvanhulle]

Merged main in to clear a conflict (a @tanstack/* version bump from #795 landed on examples/vue-query/package.json while I'd renamed the whole examples/ tree — git's rename detection cross-matched it against examples/fetch/package.json, so I fixed the mismatch by hand: fetch's deps stayed as-is, vue-query picked up @tanstack/vue-query → ^5.102.2). Everything else auto-merged cleanly. oxfmt/oxlint still clean after the merge.

Still blocked on kubb-labs/kubb#3927 for CI, as before — no change there.

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[stijnvanhulle]

Merged main in again to clear another conflict (PR #802, a changeset-release version bump that also added new plugin-zod/axios/fetch test snapshots and config blocks).

Two issues from the auto-merge, both fixed:

• The new snapshot files (pluginZod/directionalPrinterNode, pluginAxios/zodTypes, pluginFetch/zodTypes, pluginFetch/zodTypesSdk) never existed at the old tests/3.0.x/ path in this branch's history, so git couldn't detect them as renames — they landed in a stray tests/3.0.x/ alongside tests/openapi/3.0.x/. Moved them into tests/openapi/3.0.x/__snapshots__ and removed the stray directory.
• The new test config blocks main added used ../../schemas/... input paths sized for the old flat layout, one level too shallow for tests/openapi/3.0.x/. Fixed to ../../../schemas/... to match every other entry.

Full suite passes: 14 test files, 104 tests. oxfmt/oxlint clean.

Still blocked on kubb-labs/kubb#3927 for CI, as before — no change there.

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