chore: replace Biome with oxlint, oxfmt and Knip

[Thomasims]

Replaces @biomejs/biome with the shared @antelopejs/tooling-configs presets: oxlint (type-aware, via oxlint-tsgolint) for linting, oxfmt for formatting, and Knip for dead-code and dependency analysis.

Tooling swap

• biome.json deleted, @biomejs/biome removed.
• Added oxlint.config.ts, oxfmt.config.ts, knip.config.ts, each extending the shared preset.
• oxlint is pinned to exactly 1.81.0 — the JS plugin API is alpha and has to match the version tooling-configs builds against.
• Scripts: lint → oxlint, lint:fix → oxlint --fix, format → oxfmt ., format:check → oxfmt --check ., plus a new knip. .github/workflows/ci.yml gains pnpm format:check and pnpm knip steps next to the existing pnpm lint and pnpm test, in a separate ci: commit.
• oxfmt.config.ts carries a temporary .github/ISSUE_TEMPLATE/** ignore — those are Markdown templates with a .yml extension that oxfmt cannot parse. It goes away with tooling-configs#5.

tsconfig

Type-aware linting runs tsgolint, which rejects options TypeScript 7 removed and auto-discovers each file's tsconfig.json (so pointing it at a separate config does not help). Two changes:

• "moduleResolution": "node" deleted. tsgolint only rejects the explicit removed node10 value, so dropping the field satisfies it while the emit stays byte-compatible. "module": "commonjs" is deliberately left alone — raising it to node16 makes tsc emit native ESM dynamic imports that bypass the CommonJS resolver detour the ajs runtime installs.
• "baseUrl": "." deleted and the self-referencing paths entry rewritten to the relative ./src/index.ts. That mapping is what lets the conformance suite import @antelopejs/interface-redis by its published name; nothing else relied on baseUrl.

pnpm build succeeds with no source changes.

What the linter forced

Only import order, autofixed by oxlint --fix: chai now sorts before @antelopejs/interface-redis in src/tests/index.test.ts. No cycles, nothing disabled anywhere in the repo.

Four typescript(unbound-method) warnings remain on the chai assertions in that suite (expect(client.set).to.be.a("function") and friends). Warnings across this migration are a deliberate backlog — only errors gate the build — so they are left untouched rather than silenced.

What Knip needed

Two declarations, both commented in knip.config.ts:

• entry for src/tests/**/*.test.ts and src/antelope.test.ts. This is an interface package: ajs module test reads antelopeJs.test to build the test project and runs the compiled suites out of dist/tests, and that compiled tree ships in the package as the conformance suite the implementing modules run. The preset only knows the singular src/test/ spelling, so without this entry the whole suite — plus chai and @types/chai — reads as dead code.
• ignoreBinaries: ["ajs"] — the CLI comes from @antelopejs/core, which CI installs globally rather than pulling into every package's dependency tree.

Nothing was deleted. pnpm knip exits 0 (the remaining "configuration hints" are preset globs that do not match this repo).

Verification

The public surface of a versioned interface must not move, so it was checked against a build from an untouched origin/main worktree:

• package.json exports declares . and ./package.json. The runtime export keys of . are identical: GetClient, and internal with {client, SetClient, UnsetClient}.
• dist/index.js and dist/index.d.ts are byte-identical to the origin/main build. The only differences anywhere in dist are the order of two require() calls in the compiled test file and the corresponding mappings shift in dist/tests/index.test.js.map, both from the import sort above.
• Conformance suite: 14 passing, 0 failing on untouched origin/main, and 14 passing, 0 failing on this branch.
  What that suite actually exercises: ajs module test runs this branch's compiled dist/tests/**, but the interface implementation those tests call through resolves to the published @antelopejs/interface-redis@0.0.8 inside .antelope/cache/@antelopejs/redis/node_modules, not to this branch's dist/index.js. Verified by poisoning the local dist/index.js with a top-level throw: the suite still reports 14 passing. So the pass count proves the branch's compiled conformance suite still builds and runs; it does not independently validate the branch's dist/index.js. That rests on the byte-diff above.
• pnpm lint, pnpm knip and pnpm format:check all exit 0.

The oxfmt pass is a separate commit recorded in .git-blame-ignore-revs to keep git blame readable. It normalizes package.json key order and reflows Markdown code blocks in AGENTS.md, CHANGELOG.md, docs/ and skills/; no source file changed.