test(r8): move the live tests out of the round files

R8 of cleanup R-a (plan .claude/projects/2026-11-07-cleanup-r-a, appendix A).
The live tests of the round files move into the test named after their
source; each moved test was seen red under a mutation of its source.
New: tests/lib/lib-imports.test.mjs, tests/lib/timing.test.mjs (from
timing-under-load). The [#1] --gates rule and shim-line pins move into
tests/lib/autonomy-gate.test.mjs.

Removed: the round test files (retterunde, retterunde-prose-pins,
trial-mechanical-fixes, trial2-fixes, trial2-minor, trial2-minor-prose-pins,
fix-round-4-5a-prose, fix-round-4-5b2-b-prose, timing-under-load), the 8 R8
e2e scripts, and seven round test files on the R-a removal list that pinned
them (fix-round-4-5b-prose, fix-round-4-5b-part-2/3/4-scripts,
fix-round-4-5b-part-4-prose, fix-round-4-5b2-b/c-scripts). The diff-mode e2e
pin (test 24) and the red-script round-wrapper cases go too.

tests/synthetic/plan-run-C.md becomes tests/fixtures/plan-run-c.md,
regenerated from buildPlan({ version: '1.9' }). The red judge, reporter and
judge test headers now name the shared red script.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/validators/brief-validator.test.mjs

@@ -451,3 +451,68 @@ test('CLI — --min-version still locates the file positional after the value to
     rmSync(dir, { recursive: true, force: true });
   }
 });
+
+const codes = (list) => list.map((e) => e.code);
+
+function briefWith(sections) {
+  return [
+    '---', 'type: trekbrief', 'brief_version: "2.2"', 'task: t', 'slug: s',
+    'research_topics: 0', 'research_status: skipped', 'framing: new-direction', 'phase_signals_partial: true', '---', '',
+    '## TL;DR', '', 'A toy.', '', '## Intent', '', 'Why.', '', '## Goal', '', 'What.', '',
+    ...sections,
+  ].join('\n');
+}
+
+// ---- BRIEF_SC_SUBPOINTS: sub-points belong to their criterion -----------------
+
+test('BRIEF_SC_SUBPOINTS: a criterion with sub-points and no command of its own is a warning that names it', () => {
+  const r = validateBriefContent(briefWith([
+    '## Success Criteria', '',
+    '- `npm test` exits 0.',
+    '- The separator is honoured:',
+    '  - `-` joins words',
+    '  - `_` joins words',
+    '  - `.` joins words',
+    '- `bash tests/e2e.sh` exits 0.', '',
+  ]));
+  const w = r.warnings.filter((x) => x.code === 'BRIEF_SC_SUBPOINTS');
+  assert.equal(w.length, 1, JSON.stringify(r.warnings));
+  assert.match(w[0].message, /SC2/);
+});
+
+// ---- BRIEF_SC_BASH_NOT_PINNED: a bash 3.2 constraint is measured under bash 3.2 ----
+
+const BASH32 = ['## Constraints', '', '- Scripts must run under bash 3.2 (macOS system bash).', ''];
+
+test('BRIEF_SC_BASH_NOT_PINNED: a brief that requires bash 3.2 and runs a criterion with plain `bash` gets a warning pointing at /bin/bash', () => {
+  const r = validateBriefContent(briefWith([...BASH32, '## Success Criteria', '', '- `bash tests/contract.sh` exits 0.', '']));
+  const w = r.warnings.filter((x) => x.code === 'BRIEF_SC_BASH_NOT_PINNED');
+  assert.equal(w.length, 1, JSON.stringify(r.warnings));
+  assert.match(w[0].hint, /\/bin\/bash tests\//);
+});
+
+test('BRIEF_SC_BASH_NOT_PINNED: `/bin/bash`, or no bash 3.2 constraint, raises no such warning', () => {
+  const pinned = validateBriefContent(briefWith([...BASH32, '## Success Criteria', '', '- `/bin/bash tests/contract.sh` exits 0.', '']));
+  assert.ok(!codes(pinned.warnings).includes('BRIEF_SC_BASH_NOT_PINNED'));
+  const free = validateBriefContent(briefWith(['## Success Criteria', '', '- `bash tests/contract.sh` exits 0.', '']));
+  assert.ok(!codes(free.warnings).includes('BRIEF_SC_BASH_NOT_PINNED'));
+});
+
+test('BRIEF_SC_BASH_NOT_PINNED: a negated bash 3.2 constraint, an env prefix and `bash -c` are handled', () => {
+  const neg = validateBriefContent(briefWith(['## Constraints', '', '- bash 3.2 is not required here.', '',
+    '## Success Criteria', '', '- `bash tests/contract.sh` exits 0.', '']));
+  assert.ok(!codes(neg.warnings).includes('BRIEF_SC_BASH_NOT_PINNED'), 'negated constraint');
+  const env = validateBriefContent(briefWith([...BASH32, '## Success Criteria', '', '- `LC_ALL=C bash tests/contract.sh` exits 0.', '']));
+  assert.ok(codes(env.warnings).includes('BRIEF_SC_BASH_NOT_PINNED'), 'env-prefixed bash');
+  const dashC = validateBriefContent(briefWith([...BASH32, '## Success Criteria', '', '- `bash -c true` exits 0.', '']));
+  for (const w of dashC.warnings.filter((x) => x.code === 'BRIEF_SC_BASH_NOT_PINNED')) {
+    assert.doesNotMatch(w.hint, /\/bin\/bash -c/, 'never suggests a form the runner refuses');
+  }
+});
+
+test('/trekbrief proposes /bin/bash when the brief requires bash 3.2, and names both warnings', () => {
+  const md = readFileSync(new URL('../../commands/trekbrief.md', import.meta.url), 'utf8');
+  assert.match(md, /requires\s+bash\s+3\.2[^`]*`\/bin\/bash tests\/<script>\.sh`/);
+  assert.match(md, /BRIEF_SC_BASH_NOT_PINNED/);
+  assert.match(md, /BRIEF_SC_SUBPOINTS/);
+});