Migrate tests to node:test and convert CI to reusable-workflow callers - #22

Shrinks the heaviest fork's dev tree and thins its CI, per the maintained-fork program.

CI: thin callers of shared reusable workflows

The six existing workflow files are replaced with thin callers of the reusable workflows in unabandoned/.github, and two security callers are added:

• ci.yml → reusable-ci (node-versions [20, 22, 24], has-build: false)
• commitlint.yml, release-please.yml, release-cut.yml, release-security.yml → their reusable versions (secrets: inherit where applicable)
• publish.yml → reusable-publish (install-for-publish: false, secrets: inherit), with permissions: id-token: write set on the calling job for OIDC
• codeql.yml, scorecard.yml → new security callers

All callers pin uses: at @main. They reference unabandoned/.github and will go green once unabandoned/.github#1 merges.

Tests: tape → Node's built-in node:test

Migrates the suite off tape and onto node:test / node:assert, following the events fork precedent (which solved the same "Node-core tests + tape adapter under node:test" problem).

• Tape adapter (test/tape-adapter.js): a tape-compatible t assertion object backed by node:assert, implementing every t.* method used by test/*.js (equal/strictEqual, deepEqual/same, notEqual, ok/notOk, throws/doesNotThrow, pass/fail, comment, plan, end, …). Async tests that signal completion via t.plan(n)/t.end() are awaited via a promise returned to the node:test callback. Each test/*.js now requires ./tape-adapter instead of tape.
• Node-core runner (test/node/index.js): each upstream Node core buffer test (test/node/test-buffer*.js) is wrapped in a node:test subtest. test/node/common.js is adapted the way events/tests/common.js was — the process.on('exit') / process.exit(1) mustCall finalization is replaced with an explicit onFinish/drainOnFinish drain, and the deferred checks run in a final subtest (not an after() hook, which would not fail the programmatic runner). Added hasCrypto = true so the real crypto-backed assertions run, plus no-op skip/printSkipMessage.
• Entrypoint (test/index.js): requires both groups; npm test is now node test/index.js and exits non-zero on any failure.
• Inlined trivial is-buffer / is-nan equivalents in the two test files that used them so those packages can be dropped.

Verification: npm test runs 135 tests (102 tape-style + 33 Node-core subtests including the drain), 0 failures, exit 0. Forced-failure sanity check confirmed both a broken tape-style assertion and a broken Node-core assertion produce a non-zero exit. No test files were skipped or weakened.

Dropped dev tree

Removed devDependencies used only by the old tape/browser/lint pipeline: tape, airtap, standard, browserify, uglify-js, benchmark, concat-stream, hyperquest, split, through2. Removed the now-dead standard, size, perf, perf-node, test-browser-*, and update-authors scripts, plus the perf/ and bin/ directories they supported. Kept @commitlint/cli and @commitlint/config-conventional. Runtime dependencies (base64-js, ieee754) and index.js are unchanged.

Installed packages: 733 → 77 (npm ls --all node count 734 → 78 including root).

Generated by Claude Code