chore: replace Biome with oxlint, oxfmt and Knip

[Thomasims]

Replaces Biome with the shared @antelopejs/tooling-configs presets: oxlint
(type-aware, with the vendored anti-slop rules), oxfmt for formatting and Knip
for dead-code detection. oxlint is pinned to 1.81.0 because the JS plugin API
is still alpha and has to match the version tooling-configs builds against.

tsconfig

Type-aware linting runs through tsgolint, which rejects options TypeScript 7
removed, so moduleResolution: "node" and baseUrl are gone and the
self-referential @antelopejs/interface-database path mapping the suites use is
now written relative (./src/index.ts), which is what the compiler wants once
baseUrl is absent.

module stays commonjs on purpose. Raising it to node16 would look like the
tidier fix and is a runtime break: tsc stops downlevelling dynamic imports and
emits native ESM ones, which bypass the CommonJS resolver detour the ajs
runtime installs.

pnpm build succeeds with no source change.

Code changes the linter forced

• perfectionist(sort-imports): import ordering across the source and the
  suites, all applied by oxlint --fix.

• unicorn(no-thenable) on Query.then. This is the only waiver this migration
  adds, and it replaces the biome-ignore that was already there:

  // oxlint-disable-next-line unicorn/no-thenable -- Query is deliberately PromiseLike so `await query` runs it; the contract requires this method.

  Query<T> implements PromiseLike<T> is how await query executes a query, so
  the method cannot go away — and removing it would be a breaking change to the
  interface anyway.

One suppression predates this branch and is carried over unchanged: the file-wide
/* eslint-disable @typescript-eslint/no-unused-expressions */ at the top of
src/tests/merge_operations.test.ts. oxlint honours eslint-flavoured directives,
so it is still load-bearing — removing it surfaces four
eslint(no-unused-expressions) errors from that file's chai property assertions
(expect(order).to.not.be.undefined). Narrowing it to per-line oxlint-disable-next-line
comments is left for a follow-up rather than smuggled into a tooling swap.

No public export was touched. Object.keys(require(...)) is identical before and
after for all eight published subpaths (., common, datum, query,
schema, selection, stream, valueproxy).

The remaining oxlint output is warnings only, which are a deliberate backlog and
are left as they are. pnpm lint exits 0.

Knip

Nothing was deleted. Two things had to be declared instead:

• The suites live in src/tests/ (the preset only knows src/test/) and
  src/antelope.test.ts is read by ajs module test from
  package.json#antelopeJs.test. The whole compiled tree ships in the package
  and the modules implementing this interface run it as their conformance suite,
  which is why the suites are entry points rather than dead code.
• src/tests/datasets/** is the fixture surface for those suites.
  datasets/index.ts is the barrel a suite can pull the whole set from, and
  datasets/codec_fields.ts is the type-level regression test added with the
  io-ts field codecs in feat: accept io-ts codecs as table field types #8 — its only job is to keep type-checking, so nothing
  will ever import it. Declaring the directory keeps io-ts/fp-ts honestly
  accounted for instead of dropping a fixture that guards a shipped feature.
• ajs is ignored as a binary because CI installs @antelopejs/core globally
  instead of adding the CLI to every package.

Verification

pnpm build, pnpm lint, pnpm knip, pnpm format:check all exit 0.
pnpm test: 161 passing, identical to the baseline measured on an untouched
main worktree.

The oxfmt pass is a separate commit and is recorded in .git-blame-ignore-revs
so git blame stays readable. It also normalizes Markdown, YAML and the
package.json key order, which accounts for most of the diff.