chore: replace Biome with oxlint, oxfmt and Knip

[Thomasims]

Moves this repository off Biome and onto the shared
@antelopejs/tooling-configs
presets, in step with the rest of the ecosystem.

Tooling swap

• @biomejs/biome and biome.json are gone.
• oxlint (pinned to 1.81.0, the version the presets' JS plugin API matches),
  oxfmt, knip, oxlint-tsgolint and eslint-plugin-perfectionist come in as
  dev dependencies.
• New oxlint.config.ts, oxfmt.config.ts and knip.config.ts, each extending
  the shared preset.
• Scripts: lint → oxlint, lint:fix → oxlint --fix, format → oxfmt .,
  plus new format:check and knip. Every other script is untouched.

The .github/ISSUE_TEMPLATE/** ignore in oxfmt.config.ts is temporary: those
files are Markdown templates with a .yml extension, which oxfmt cannot parse.
It goes away once
tooling-configs#5 ships
the shared ignore.

tsconfig

Type-aware linting runs through tsgolint, which rejects compiler options
TypeScript 7 removed and auto-discovers each file's tsconfig.json. So
"moduleResolution": "node" (the removed node10) is dropped, and baseUrl
goes with it — the two self-referential paths entries the suites use to import
the package by its own name become relative (./src/index.ts, ./src/*), which
is what baseUrl: "." resolved them to anyway.

"module": "commonjs" deliberately stays. Raising it to node16 looks like the
obvious fix and is a runtime break: tsc would stop downlevelling dynamic imports
and emit native ESM ones, bypassing the CommonJS resolver detour the ajs
runtime installs.

What the linter forced

Import order, and nothing else — 57 perfectionist(sort-imports) errors on
origin/main, all autofixed (two oxlint --fix passes: the first clears 23 and
reports the 34 that a second pass then fixes). import(no-cycle) found no
cycles in this tree. Nothing was disabled and no rule was silenced. The 12
remaining oxlint findings are warnings, the deliberate backlog the presets ship
with, left alone here.

One further source edit is unrelated to the linter and lives in its own chore:
commit: the // biome-ignore lint/complexity/noThisInStatic directive in
src/table.ts suppressed nothing once Biome was removed, so the directive was
dropped and its explanation kept as a plain comment.

Knip

The suites needed declaring as entry points. They live in src/tests/, which
the preset's src/test/ glob does not match, and ajs module test runs them
from the compiled output while reading src/antelope.test.ts (named by
antelopeJs.test) to build the test project. Without that, the whole suite plus
chai, @types/chai and mongodb-memory-server-core read as dead.

The entry glob is src/tests/**/*.ts, not just **/*.test.ts, so it takes in
src/tests/codec_helpers.ts as well. The whole compiled tree ships in the
package for the implementing modules to run as their conformance suite, so that
fixture is an outside-reachable surface in its own right rather than an internal
module whose exports Knip can trace.

ignoreBinaries: ["ajs"] matches the rest of the ecosystem: the CLI comes from
@antelopejs/core, which CI installs globally rather than pulling into every
module's dependency tree.

No exports were removed. This package is a versioned contract: its surface is
reachable only from consumers Knip cannot see, so an "unused export" here would
never be evidence of dead code.

Verification

• Public surface unchanged. dist was built from untouched origin/main
  and from this branch, and the runtime export keys of every module behind the
  exports map (., ./common, ./database, ./model, ./relation,
  ./schema, ./table and the five ./modifiers/* subpaths) were diffed:
  identical. Before the import sort, the entire dist tree was byte-identical
  to the baseline, which confirms the tsconfig change alone changes no emit.
  After it, the only .d.ts differences are reordered import lines in
  model.d.ts and table.d.ts.
• Tests. pnpm test on untouched origin/main: 102 passing, 0 failing. On
  this branch: 102 passing, 0 failing.
• pnpm lint, pnpm knip and pnpm build all exit 0.

Commits

The oxfmt pass is its own commit and is recorded in .git-blame-ignore-revs, so
git blame stays readable. oxfmt also normalizes package.json key order and
sorts keywords; that is expected.