chore(repo): seed effect-e2e from core

.github/actions/checks-lane/action.yml

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+name: effect-e2e checks lane
+description: effect-e2e's steps for each phase of systemfsoftware's reusable-checks.yml
+inputs:
+  lane:
+    description: plan, static, affected, test, test-after, timings, gate or docs
+    required: true
+  job:
+    description: The test job from the plan, as JSON
+    required: false
+    default: "{}"
+  profile:
+    description: Conformance profile, `local` (pull request) or `per-change` (main and the merge queue)
+    required: false
+    default: per-change
+runs:
+  using: composite
+  steps:
+    - if: inputs.lane == 'plan' || inputs.lane == 'timings'
+      uses: systemfsoftware/systemfsoftware/.github/actions/sfs-tools@21dfc32e9927c87a31a37d19e5643445a4e398c3
+      with:
+        repository: systemfsoftware/systemfsoftware
+        ref: 21dfc32e9927c87a31a37d19e5643445a4e398c3
+    - if: inputs.lane == 'plan'
+      shell: bash -e {0}
+      run: corepack enable
+
+    - name: Affected lane environment
+      if: inputs.lane == 'affected'
+      shell: bash -e {0}
+      run: printf 'CI=true\nCONFORMANCE_PROFILE=local\nTURBO_LOG_ORDER=stream\n' >> "$GITHUB_ENV"
+    - uses: systemfsoftware/systemfsoftware/.github/actions/install-deps@21dfc32e9927c87a31a37d19e5643445a4e398c3
+      if: inputs.lane == 'affected'
+    - name: Turbo cache
+      if: inputs.lane == 'affected'
+      uses: actions/cache@v6
+      with:
+        path: .turbo/cache
+        key: turbo-${{ runner.os }}-affected-${{ github.sha }}
+        restore-keys: |
+          turbo-${{ runner.os }}-affected-
+          turbo-${{ runner.os }}-checks-
+          turbo-${{ runner.os }}-
+    - name: The tests this change affects or touches
+      id: affected
+      if: inputs.lane == 'affected'
+      shell: bash -e {0}
+      run: node .github/ci/pr-tests.mjs plan
+    - name: Cache Playwright browsers
+      if: inputs.lane == 'affected' && steps.affected.outputs.browsers == 'true'
+      uses: actions/cache@v6
+      with:
+        path: ~/.cache/ms-playwright
+        key: playwright-${{ runner.os }}-${{ hashFiles('pnpm-lock.yaml') }}
+        restore-keys: |
+          playwright-${{ runner.os }}-
+    - name: Install Playwright chromium
+      if: inputs.lane == 'affected' && steps.affected.outputs.browsers == 'true'
+      shell: bash -e {0}
+      env:
+        PACKAGE: ${{ steps.affected.outputs.browser-package }}
+      run: corepack pnpm --filter "$PACKAGE" exec playwright install --with-deps chromium
+    - name: Run them
+      if: inputs.lane == 'affected'
+      shell: bash -e {0}
+      env:
+        BASE: ${{ steps.affected.outputs.base }}
+      run: node .github/ci/pr-tests.mjs run
+
+    - name: Static lane environment
+      if: inputs.lane == 'static'
+      shell: bash -e {0}
+      run: printf 'CI=true\nOXLINT_FORMAT=github\nTSGO_FORMAT=github-actions\nTURBO_LOG_ORDER=stream\n' >> "$GITHUB_ENV"
+    - uses: systemfsoftware/systemfsoftware/.github/actions/install-deps@21dfc32e9927c87a31a37d19e5643445a4e398c3
+      if: inputs.lane == 'static'
+    - uses: cachix/install-nix-action@v31
+      if: inputs.lane == 'static' || inputs.lane == 'docs'
+    - name: dprint from the flake
+      if: inputs.lane == 'static' || inputs.lane == 'docs'
+      shell: bash -e {0}
+      run: echo "$(nix build --no-link --print-out-paths .#dprint)/bin" >> "$GITHUB_PATH"
+    - name: Turbo cache
+      if: inputs.lane == 'static'
+      uses: actions/cache@v6
+      with:
+        path: .turbo/cache
+        key: turbo-${{ runner.os }}-checks-${{ github.sha }}
+        restore-keys: |
+          turbo-${{ runner.os }}-checks-
+          turbo-${{ runner.os }}-
+
+    - name: Test lane environment
+      if: inputs.lane == 'test'
+      shell: bash -e {0}
+      run: printf 'CI=true\n' >> "$GITHUB_ENV"
+    - name: Local conformance profile
+      if: inputs.lane == 'test' && inputs.profile == 'local'
+      shell: bash -e {0}
+      run: printf 'CONFORMANCE_PROFILE=local\n' >> "$GITHUB_ENV"
+    - uses: systemfsoftware/systemfsoftware/.github/actions/install-deps@21dfc32e9927c87a31a37d19e5643445a4e398c3
+      if: inputs.lane == 'test'
+    - name: Turbo cache
+      if: inputs.lane == 'test'
+      uses: actions/cache@v6
+      with:
+        path: .turbo/cache
+        key: turbo-${{ runner.os }}-test-${{ fromJSON(inputs.job).id }}-${{ github.sha }}
+        restore-keys: |
+          turbo-${{ runner.os }}-test-${{ fromJSON(inputs.job).id }}-
+          turbo-${{ runner.os }}-checks-
+          turbo-${{ runner.os }}-
+    - name: Cache Playwright browsers
+      if: inputs.lane == 'test' && fromJSON(inputs.job).browser
+      uses: actions/cache@v6
+      with:
+        path: ~/.cache/ms-playwright
+        key: playwright-${{ runner.os }}-${{ hashFiles('pnpm-lock.yaml') }}
+        restore-keys: |
+          playwright-${{ runner.os }}-
+    - name: Install Playwright chromium
+      if: inputs.lane == 'test' && fromJSON(inputs.job).browser
+      shell: bash -e {0}
+      run: corepack pnpm --filter @systemfsoftware/effect-e2e-web exec playwright install --with-deps chromium
+    - name: Build
+      if: inputs.lane == 'test'
+      shell: bash -e {0}
+      env:
+        FILTERS: ${{ fromJSON(inputs.job).filters }}
+      run: corepack pnpm exec turbo run build --output-logs=errors-only --log-order=stream $FILTERS
+
+    # Heavy: the browser engine suites run on main and in the merge queue, never on a pull request.
+    - name: Browser engine suites
+      if: inputs.lane == 'test-after' && inputs.profile != 'local' && fromJSON(inputs.job).browser && (fromJSON(inputs.job).shard == null || fromJSON(inputs.job).shard.index == 1)
+      shell: bash -e {0}
+      env:
+        FILTERS: ${{ fromJSON(inputs.job).filters }}
+      run: corepack pnpm exec turbo run test:engine --concurrency=1 --continue --output-logs=new-only --log-order=stream $FILTERS

.github/ci/no-tests-before-merge.mjs

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+import { appendFile } from 'node:fs/promises'
+
+const output = process.env.GITHUB_OUTPUT
+if (process.argv[2] === 'plan' && output) await appendFile(output, 'jobs=[]\n')

.github/ci/pr-tests.mjs

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+import { execFile, spawn } from 'node:child_process'
+import { appendFile, readFile } from 'node:fs/promises'
+import { promisify } from 'node:util'
+
+const exec = promisify(execFile)
+
+const command = async (cmd, args, env = {}) => {
+  const { stdout } = await exec(cmd, args, { env: { ...process.env, ...env }, maxBuffer: 64 * 1024 * 1024 })
+  return stdout
+}
+
+const git = async (...args) => (await command('git', args)).trim()
+
+const turboLs = async (env, affected) => {
+  const text = await command('corepack', [
+    'pnpm',
+    'exec',
+    'turbo',
+    'ls',
+    ...(affected ? ['--affected'] : []),
+    '--output=json',
+  ], env)
+  return JSON.parse(text.slice(text.indexOf('{'))).packages.items
+}
+
+const manifest = async (pkg) => JSON.parse(await readFile(`${pkg.path}/package.json`, 'utf8'))
+
+const owner = (packages, file) =>
+  packages
+    .filter((pkg) => file.startsWith(`${pkg.path}/`))
+    .reduce((best, pkg) => (best === undefined || pkg.path.length > best.path.length ? pkg : best), undefined)
+
+const otherTestTasks = ['test:engine']
+
+const plan = async (base) => {
+  const head = await git('rev-parse', 'HEAD')
+  const scm = { TURBO_SCM_BASE: base, TURBO_SCM_HEAD: head }
+  const changed = (await git('diff', '--name-only', '--diff-filter=AMR', '-z', base, head)).split('\0').filter(Boolean)
+  const [all, affected] = await Promise.all([turboLs(scm, false), turboLs(scm, true)])
+  const manifests = new Map(await Promise.all(all.map(async (pkg) => [pkg.name, await manifest(pkg)])))
+
+  const filesByPackage = new Map()
+  for (const file of changed) {
+    const pkg = owner(all, file)
+    if (pkg === undefined) continue
+    filesByPackage.set(pkg.name, [...(filesByPackage.get(pkg.name) ?? []), file.slice(pkg.path.length + 1)])
+  }
+
+  const commands = [[
+    'corepack',
+    'pnpm',
+    'exec',
+    'turbo',
+    'run',
+    'test',
+    '--affected',
+    '--continue',
+    '--concurrency=50%',
+    '--output-logs=new-only',
+    '--log-order=stream',
+    '--',
+    `--changed=${base}`,
+    '--passWithNoTests',
+  ]]
+  for (const [name, files] of filesByPackage) {
+    for (const task of otherTestTasks) {
+      if (manifests.get(name)?.scripts?.[task] === undefined) continue
+      commands.push([
+        'corepack',
+        'pnpm',
+        'exec',
+        'turbo',
+        'run',
+        task,
+        `--filter=${name}`,
+        '--output-logs=new-only',
+        '--',
+        '--passWithNoTests',
+        ...files,
+      ])
+    }
+  }
+
+  const browserPackages = affected.filter((pkg) => {
+    const json = manifests.get(pkg.name)
+    return json?.scripts?.test !== undefined && json.devDependencies?.playwright !== undefined
+  })
+  return { head, scm, changed, affected, commands, browserPackages }
+}
+
+const status = (cmd, args, env) =>
+  new Promise((resolve) => {
+    const child = spawn(cmd, args, { env: { ...process.env, ...env }, stdio: 'inherit' })
+    child.on('close', (code) => resolve(code ?? 1))
+    child.on('error', () => resolve(1))
+  })
+
+const mode = process.argv[2]
+if (mode !== 'plan' && mode !== 'run') {
+  console.error('usage: pr-tests.mjs plan|run')
+  process.exit(2)
+}
+const base = process.env.BASE || (await git('rev-parse', 'HEAD^1'))
+const { head, scm, changed, affected, commands, browserPackages } = await plan(base)
+
+if (mode === 'plan') {
+  console.log(`base ${base}, head ${head}: ${changed.length} changed files, ${affected.length} affected packages`)
+  for (const pkg of affected) console.log(`  affected ${pkg.name}`)
+  for (const cmd of commands) console.log(cmd.join(' '))
+  const output = process.env.GITHUB_OUTPUT
+  if (output) {
+    const browserPackage = browserPackages[0]?.name ?? ''
+    await appendFile(
+      output,
+      `base=${base}\nbrowsers=${browserPackages.length > 0}\nbrowser-package=${browserPackage}\n`,
+    )
+  }
+} else {
+  let failed = false
+  for (const [cmd, ...args] of commands) {
+    console.log(`::group::${[cmd, ...args].join(' ')}`)
+    const code = await status(cmd, args, scm)
+    console.log('::endgroup::')
+    if (code !== 0) {
+      console.log(`::error title=pr-tests::${[cmd, ...args].join(' ')} exited ${code}`)
+      failed = true
+    }
+  }
+  process.exit(failed ? 1 : 0)
+}

.github/workflows/ci.yml

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+name: CI
+
+# Fast checks before the merge, heavy suites after it (owner, 2026-10-29: "They need to be fast with the heavier
+# checks on main"), the shape of core's #881. A pull request and a merge-queue draft run the static lane and the
+# `affected` lane (.github/ci/pr-tests.mjs), and their plan schedules no packed test job
+# (.github/ci/no-tests-before-merge.mjs). Main runs every package's whole suite in the packed test jobs.
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  merge_group:
+  workflow_dispatch:
+# Every commit on main gets its own run and verdict; on any other ref a newer push cancels the superseded run.
+concurrency:
+  group: ci-${{ github.ref == 'refs/heads/main' && github.sha || github.ref }}
+  cancel-in-progress: ${{ github.ref != 'refs/heads/main' }}
+
+permissions:
+  contents: read
+
+jobs:
+  conflicts:
+    name: no merge conflicts
+    uses: systemfsoftware/systemfsoftware/.github/workflows/conflict-check.yml@21dfc32e9927c87a31a37d19e5643445a4e398c3
+    with:
+      base_ref: ${{ github.event.pull_request.base.ref }}
+      head_sha: ${{ github.event.pull_request.head.sha }}
+  checks:
+    name: build · lint · typecheck · test
+    needs: conflicts
+    permissions:
+      contents: read
+      actions: read
+    uses: systemfsoftware/systemfsoftware/.github/workflows/reusable-checks.yml@21dfc32e9927c87a31a37d19e5643445a4e398c3
+    with:
+      profile: ${{ github.ref == 'refs/heads/main' && 'per-change' || 'local' }}
+      record: test-timings-${{ github.ref == 'refs/heads/main' && 'per-change' || 'local' }}
+      timings: ${{ github.ref == 'refs/heads/main' && 'test-timings' || 'node .github/ci/no-tests-before-merge.mjs' }}
+      node-options: --max-old-space-size=4096
+      pnpm: corepack pnpm
+      test-flags: --output-logs=new-only --log-order=stream --log-prefix=none
+      gate-name: the gate (pnpm check:ci)
+      lanes: >-
+        ${{ github.ref == 'refs/heads/main'
+        && '[{"id": "static", "name": "static checks (pnpm check:static)", "timeout-minutes": 45, "node-options": "--max-old-space-size=4096", "run": "corepack pnpm check:static", "docs-run": "./bin/dprint check"}]'
+        || '[{"id": "static", "name": "static checks (pnpm check:static)", "timeout-minutes": 45, "node-options": "--max-old-space-size=4096", "run": "corepack pnpm check:static", "docs-run": "./bin/dprint check"}, {"id": "affected", "name": "affected tests (turbo --affected, vitest --changed)", "timeout-minutes": 30, "fetch-depth": 2, "node-options": "--max-old-space-size=4096"}]' }}

.github/workflows/commitlint.yml

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+name: Commitlint
+
+on:
+  pull_request:
+    branches: [main]
+
+permissions:
+  contents: read
+
+jobs:
+  commitlint:
+    name: commitlint
+    uses: systemfsoftware/systemfsoftware/.github/workflows/reusable-commitlint.yml@21dfc32e9927c87a31a37d19e5643445a4e398c3

.github/workflows/nix.yml

@@ -0,0 +1,21 @@
+name: Nix
+
+# Heavy: builds every flake output that changed. Runs on main and on demand, never on a pull request.
+on:
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref == 'refs/heads/main' && github.sha || github.ref }}
+  cancel-in-progress: ${{ github.ref != 'refs/heads/main' }}
+
+jobs:
+  nix:
+    name: nix
+    uses: systemfsoftware/systemfsoftware/.github/workflows/reusable-nix.yml@21dfc32e9927c87a31a37d19e5643445a4e398c3
+    with:
+      systems: '[{"system": "x86_64-linux", "runner": "ubuntu-latest"}]'

.gitignore

@@ -0,0 +1,20 @@
+node_modules/
+dist/
+.turbo/
+coverage/
+.vitest/
+reports/
+__tmp__/
+.stryker-tmp/
+temp/
+*.tsbuildinfo
+.DS_Store
+.npmrc
+.direnv/
+/result
+/result-*
+/deno.lock
+.timings/
+.sfs-tools/
+# Core tarballs, built by `nix build .#sfs-deps` (CI: the sfs-deps job); never committed
+.sfs-deps/

.mergify.yml

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+# Mergify: the policy lives in systemfsoftware/.github (.mergify.yml). This file only names this repository's checks.
+extends: .github
+
+queue_rules:
+  - name: default
+    queue_conditions:
+      - check-success = no merge conflicts
+      - check-success = build · lint · typecheck · test / static checks (pnpm check:static)
+      - or:
+          - check-success = commitlint / lint PR commits
+          - check-skipped = commitlint / lint PR commits
+    merge_conditions:
+      - check-success = build · lint · typecheck · test / the gate (pnpm check:ci)