chore(tooling): make the oxlint config effective and clear its warnings

[Alex1990]

Problem

pnpm lint reported 39 warnings, and the repository's lint config turned out never to have been in effect:

• oxlint 1.x auto-loads .oxlintrc.json; the checked-in oxlint.json is ignored by discovery.

• That file also used the ignore key, which the 1.x schema rejects (renamed ignorePatterns). Reading it explicitly fails outright:

  Failed to parse config with error Error("unknown field `ignore`, expected one of
  `$schema`, `plugins`, `jsPlugins`, `categories`, `rules`, `settings`, `env`,
  `globals`, `overrides`, `ignorePatterns`, `extends`")
  

So both CI (pnpm lint) and the lint-staged hook linted with the default rule set only, and the three rules the file meant to turn off never were.

Changes

• Rename oxlint.json → .oxlintrc.json so it is discovered, fix ignore → ignorePatterns, and add an override that turns no-unused-vars off for test/test-types*.ts. In those files a declared-but-unused value is the assertion: @ts-expect-error imports of exports an entry must not have (azure, aws, cos, obs) and return-type checks such as const putPromise: Promise<any> = put(...). Deleting them would drop type coverage rather than dead code.
• Drop what the now-active rules flag: an unused encodeUtf8 import in the COS request layer, unused start/end part bounds in multipartUpload (the bounds actually uploaded are derived from pendingParts), an unused catch binding, and two leftovers in tests.
• AGENTS.md points at the new file name. This is a norms-layer change, which per the repo rules is a proposal — hence the PR instead of a direct push to main.

Verification

Run on the branch:

pnpm lint        → Found 0 warnings and 0 errors. (90 files, 89 rules)
pnpm check:types → clean (7 × tsc --noEmit)
pnpm fmt:check   → All matched files use the correct format.
npx vitest run test/multipart.spec.ts test/cos.spec.ts test/aws.spec.ts \
  test/provider.spec.ts test/index.spec.ts test/*-signature.spec.ts
                 → 77 passed | 13 skipped

test/index.spec.ts's only failure is its integration beforeAll, which fetches http://localhost:8080/api/oss-config and needs pnpm serve running; unrelated to this change.

[github-actions]

Coverage

Metric	%	Covered / Total
Lines	91.73%	1121/1222
Statements	90.42%	1209/1337
Functions	92.76%	218/235
Branches	76.97%	575/747

[github-actions]

Loop triage — needs-triage (human-owned; the loop must not decide this one).

This is an owner-authored, same-repo PR that edits the norms layer (AGENTS.md) plus lint tooling and a small dead-code cleanup. AGENTS.md says norms-layer changes land as a proposal that a human merges, and the loop must not be the maker or checker of the norms it runs on (precedent #36/#37/#47/#49/#51/#53). The change is already written and correct, so no agent-actionable work remains — only your review/merge decision. Routing to the human inbox.

Verified read-only — the change itself checks out

• pnpm lint → 0 warnings / 0 errors (90 files, 89 rules). Moving .oxlintrc.json away reproduces 33 warnings from default discovery, and the old config fails to parse exactly as described: unknown field 'ignore' (oxlint 1.41.0). The diagnosis is confirmed.
• pnpm fmt:check clean. pnpm build + pnpm check:types exit 0 — note check:types resolves ../dist/*, so a fresh tree without dist/ reports TS2307; pre-existing, not this PR.
• CI on head b58271b: Lint pass (14s), Test pass (1m05s). MERGEABLE, REVIEW_REQUIRED; base bb2c01b == origin/main, one commit.
• The multipartUpload deletions are real dead code: the first loop only builds the checkpoint, and the uploaded bounds are recomputed from pendingParts below.
• The no-unused-vars: off override for test/test-types*.ts is justified: e.g. test/test-types-cos.ts:74-75 imports putSymlink under @ts-expect-error precisely to assert the COS entry must not export it, and other test-types files use declared-but-unused values as return-type assertions. Deleting them would drop type coverage, not dead code.

No ready-for-agent work exists. Nothing pushed or written by the loop.