// tests/review/brief-conflict-findings.test.mjs
// The brief-conflict rule (plan 2026-10-11-files-backticks-trial4, Step 8).
//
// A `/code-review` finding at the MAJOR tier whose recommended action
// contradicts a named brief Non-Goal (or stated choice) is kept, marked with
// `contradicts_brief: "<the Non-Goal, verbatim>"`, and drops to MINOR with
// `brief_lowered_from: 'MAJOR'`. Nothing else is ever lowered by the mark: a
// BLOCKER stays BLOCKER, a `/security-review` finding keeps its severity, a
// reviewer-agent finding (no `engine`) is never marked. The verdict gate
// refuses (exit 2) every shape outside the one legal one.
//
// The new exports are probed via `import * as m` so a missing export is an
// assertion failure, never a load-time crash. Fixtures are read inside tests.

import { test } from 'node:test';
import { strict as assert } from 'node:assert';
import { spawnSync } from 'node:child_process';
import { readFileSync, existsSync } from 'node:fs';
import { join, dirname } from 'node:path';
import { fileURLToPath } from 'node:url';
import * as m from '../../lib/review/coordinator-contract.mjs';

const ROOT = join(dirname(fileURLToPath(import.meta.url)), '..', '..');
const GATE = join(ROOT, 'lib', 'review', 'verdict-gate.mjs');
const LEGAL_FIXTURE = join(ROOT, 'tests', 'fixtures', 'review-brief-conflict-legal.md');
const ILLEGAL_FIXTURE = join(ROOT, 'tests', 'fixtures', 'review-brief-conflict-illegal.md');

const NON_GOAL = 'No retry layer around the HTTP client (Non-Goal 2)';

function illegal(f) {
  assert.equal(typeof m.illegalBriefLowering, 'function',
    'coordinator-contract.mjs must export illegalBriefLowering(f)');
  return m.illegalBriefLowering(f);
}

function lowerable(f) {
  assert.equal(typeof m.lowerableBriefConflict, 'function',
    'coordinator-contract.mjs must export lowerableBriefConflict(f)');
  return m.lowerableBriefConflict(f);
}

function codeReviewDefect(extra = {}) {
  return {
    file: 'lib/http.mjs', line: 42, rule_key: 'CODE_REVIEW_DEFECT', severity: 'MAJOR',
    title: 'No retry on transient failure', detail: 'A 503 fails the call.',
    recommended_action: 'Wrap the call in a retry with backoff.', engine: 'code-review',
    ...extra,
  };
}

function payload(reviewer, findings) {
  return [{ reviewer, findings }];
}

function legalShape(extra = {}) {
  return codeReviewDefect({
    id: 'd3c22f4b1309d6001a0f3948e377a8e80a4b9c55',
    severity: 'MINOR', contradicts_brief: NON_GOAL, brief_lowered_from: 'MAJOR', ...extra,
  });
}

function assertAllOutputLegal(result) {
  for (const f of result.findings) {
    assert.equal(illegal(f), false,
      `runContract wrote a finding illegalBriefLowering refuses: ${JSON.stringify(f)}`);
  }
}

// ---- runContract (Pass 3) ----------------------------------------------------

test('runContract — a marked /code-review MAJOR drops to MINOR, keeps the Non-Goal, verdict ALLOW, not unverified', () => {
  const result = m.runContract(payload('claude-code-review', [codeReviewDefect({ contradicts_brief: NON_GOAL })]));
  assert.equal(result.findings.length, 1, 'the brief-conflicting finding is kept, never removed');
  const f = result.findings[0];
  assert.equal(f.contradicts_brief, NON_GOAL, 'the Non-Goal is named verbatim');
  assert.equal(f.severity, 'MINOR');
  assert.equal(f.brief_lowered_from, 'MAJOR');
  assert.equal(result.verdict, 'ALLOW');
  assert.equal(result.unverified.length, 0, 'the mark is not a suppression reason');
  assert.deepEqual(result.allow_blocked_by, []);
  assertAllOutputLegal(result);
});

test('runContract — the same /code-review MAJOR without the mark stays MAJOR and WARN', () => {
  const result = m.runContract(payload('claude-code-review', [codeReviewDefect()]));
  assert.equal(result.findings[0].severity, 'MAJOR');
  assert.equal('brief_lowered_from' in result.findings[0], false);
  assert.equal(result.verdict, 'WARN');
  assertAllOutputLegal(result);
});

test('runContract — a marked /code-review BLOCKER-tier finding stays BLOCKER and BLOCK', () => {
  const f = codeReviewDefect({ rule_key: 'SECURITY_INJECTION', severity: 'BLOCKER', contradicts_brief: NON_GOAL });
  const result = m.runContract(payload('claude-code-review', [f]));
  assert.equal(result.findings[0].severity, 'BLOCKER');
  assert.equal('brief_lowered_from' in result.findings[0], false);
  assert.equal(result.findings[0].contradicts_brief, NON_GOAL, 'the mark is kept on an engine finding');
  assert.equal(result.verdict, 'BLOCK');
  assertAllOutputLegal(result);
});

test('runContract — a marked /security-review finding keeps BLOCKER', () => {
  const f = {
    file: 'lib/auth.mjs', line: 9, rule_key: 'SECURITY_REVIEW_VULNERABILITY', severity: 'BLOCKER',
    title: 'Token in log', detail: 'd', recommended_action: 'Remove the log line.',
    engine: 'security-review', contradicts_brief: NON_GOAL,
  };
  const result = m.runContract(payload('claude-security-review', [f]));
  assert.equal(result.findings[0].severity, 'BLOCKER');
  assert.equal('brief_lowered_from' in result.findings[0], false);
  assert.equal(result.verdict, 'BLOCK');
  assertAllOutputLegal(result);
});

test('runContract — a marked MINOR-tier CODE_REVIEW_IMPROVEMENT stays MINOR with no brief_lowered_from', () => {
  const f = codeReviewDefect({ rule_key: 'CODE_REVIEW_IMPROVEMENT', severity: 'MINOR', contradicts_brief: NON_GOAL });
  const result = m.runContract(payload('claude-code-review', [f]));
  assert.equal(result.findings[0].severity, 'MINOR');
  assert.equal('brief_lowered_from' in result.findings[0], false);
  assert.equal(result.findings[0].contradicts_brief, NON_GOAL);
  assertAllOutputLegal(result);
});

test('runContract — a reviewer finding (no engine) that arrives marked loses the mark and keeps today\'s reset', () => {
  const f = {
    file: 'lib/b.mjs', line: 7, rule_key: 'MISSING_TEST', severity: 'BLOCKER',
    title: 'No test', detail: 'd', recommended_action: 'Add a test.', contradicts_brief: NON_GOAL,
  };
  const result = m.runContract(payload('code-correctness-reviewer', [f]));
  const out = result.findings[0];
  assert.equal('contradicts_brief' in out, false, 'only an engine finding is ever marked');
  assert.equal(out.severity, 'MAJOR');
  assert.equal(out.original_severity, 'BLOCKER');
  assert.equal('brief_lowered_from' in out, false);
  assertAllOutputLegal(result);
});

test('runContract — an incoming brief_lowered_from is removed from every finding', () => {
  const reviewer = {
    file: 'lib/b.mjs', line: 7, rule_key: 'MISSING_TEST', severity: 'MAJOR',
    title: 'No test', detail: 'd', recommended_action: 'Add a test.', brief_lowered_from: 'MAJOR',
  };
  const engineBlocker = codeReviewDefect({ line: 50, rule_key: 'SECURITY_INJECTION', severity: 'BLOCKER', brief_lowered_from: 'BLOCKER' });
  const engineUnmarked = codeReviewDefect({ line: 60, brief_lowered_from: 'MAJOR' });
  const lowerableOne = codeReviewDefect({ line: 70, contradicts_brief: NON_GOAL, brief_lowered_from: 'BLOCKER' });
  const result = m.runContract([
    { reviewer: 'code-correctness-reviewer', findings: [reviewer] },
    { reviewer: 'claude-code-review', findings: [engineBlocker, engineUnmarked, lowerableOne] },
  ]);
  const byLine = new Map(result.findings.map((f) => [f.line, f]));
  assert.equal('brief_lowered_from' in byLine.get(7), false);
  assert.equal('brief_lowered_from' in byLine.get(50), false);
  assert.equal(byLine.get(50).severity, 'BLOCKER');
  assert.equal('brief_lowered_from' in byLine.get(60), false);
  assert.equal(byLine.get(60).severity, 'MAJOR');
  assert.equal(byLine.get(70).severity, 'MINOR');
  assert.equal(byLine.get(70).brief_lowered_from, 'MAJOR', 'only the lowering itself writes the field');
  assertAllOutputLegal(result);
});

test('lowerableBriefConflict — only a marked /code-review finding at MAJOR on a MAJOR-tier key', () => {
  assert.equal(lowerable(codeReviewDefect({ contradicts_brief: NON_GOAL })), true);
  assert.equal(lowerable(codeReviewDefect()), false, 'no mark');
  assert.equal(lowerable(codeReviewDefect({ contradicts_brief: '' })), false, 'empty mark');
  assert.equal(lowerable(codeReviewDefect({ contradicts_brief: true })), false, 'non-string mark');
  assert.equal(lowerable(codeReviewDefect({ contradicts_brief: NON_GOAL, engine: 'security-review' })), false);
  assert.equal(lowerable(codeReviewDefect({ contradicts_brief: NON_GOAL, engine: undefined })), false, 'missing engine');
  assert.equal(lowerable(codeReviewDefect({ contradicts_brief: NON_GOAL, rule_key: 'NOPE' })), false, 'unknown key');
  assert.equal(lowerable(codeReviewDefect({ contradicts_brief: NON_GOAL, rule_key: 'SECURITY_INJECTION', severity: 'BLOCKER' })), false);
  assert.equal(lowerable(codeReviewDefect({ contradicts_brief: NON_GOAL, severity: 'BLOCKER' })), false, 'severity must be MAJOR');
});

// ---- effectiveSeverity (Pass 2 trimming) -------------------------------------

test('judgeFilter — a marked /code-review MAJOR with a long detail is trimmed, its mark intact; unmarked it is kept whole', () => {
  const long = 'x'.repeat(900);
  const marked = codeReviewDefect({ detail: long, contradicts_brief: NON_GOAL });
  const unmarked = codeReviewDefect({ detail: long });
  const a = m.judgeFilter([marked]);
  assert.equal(a.trimmed.length, 1, 'the marked finding is judged MINOR, so its text may be trimmed');
  assert.equal(a.trimmed[0].contradicts_brief, NON_GOAL, 'trimming never touches the mark');
  assert.ok(a.trimmed[0].detail.length <= m.JUDGE_DETAIL_MAX);
  const b = m.judgeFilter([unmarked]);
  assert.equal(b.trimmed.length, 0, 'an unmarked MAJOR keeps every character');
  assert.equal(b.kept[0].detail, long);

  const result = m.runContract(payload('claude-code-review', [marked]));
  assert.equal(result.trimmed_count, 1);
  assert.equal(result.findings[0].contradicts_brief, NON_GOAL);
  assert.equal(result.findings[0].severity, 'MINOR');
});

// ---- illegalBriefLowering ----------------------------------------------------

test('illegalBriefLowering — the legal shape is false', () => {
  assert.equal(illegal(legalShape()), false);
});

test('illegalBriefLowering — a marked BLOCKER-tier engine finding below BLOCKER is true, with and without brief_lowered_from', () => {
  const base = { rule_key: 'SECURITY_INJECTION', contradicts_brief: NON_GOAL };
  assert.equal(illegal(codeReviewDefect({ ...base, severity: 'MINOR', brief_lowered_from: 'MAJOR' })), true);
  assert.equal(illegal(codeReviewDefect({ ...base, severity: 'MAJOR', brief_lowered_from: 'BLOCKER' })), true);
  assert.equal(illegal(codeReviewDefect({ ...base, severity: 'MAJOR' })), true);
  assert.equal(illegal(codeReviewDefect({ ...base, severity: 'MINOR' })), true);
});

test('illegalBriefLowering — a marked /security-review finding below its tier is true', () => {
  const f = {
    id: 'a'.repeat(40), file: 'lib/auth.mjs', line: 9, rule_key: 'SECURITY_REVIEW_VULNERABILITY',
    engine: 'security-review', contradicts_brief: NON_GOAL,
  };
  assert.equal(illegal({ ...f, severity: 'MAJOR' }), true);
  assert.equal(illegal({ ...f, severity: 'MINOR', brief_lowered_from: 'MAJOR' }), true);
});

test('illegalBriefLowering — a marked reviewer finding (no engine) is true at any severity', () => {
  const f = { id: 'b'.repeat(40), file: 'lib/b.mjs', line: 7, rule_key: 'MISSING_TEST', contradicts_brief: NON_GOAL };
  assert.equal(illegal({ ...f, severity: 'MINOR' }), true, 'below its tier');
  assert.equal(illegal({ ...f, severity: 'MAJOR' }), true, 'at its tier');
  assert.equal(illegal({ ...f, severity: 'BLOCKER' }), true, 'above its tier');
});

test('illegalBriefLowering — brief_lowered_from without a mark is true', () => {
  assert.equal(illegal(legalShape({ contradicts_brief: undefined })), true,
    'brief_lowered_from MAJOR on an otherwise legal finding without a mark');
  const reviewer = { id: 'b'.repeat(40), file: 'lib/b.mjs', line: 7, rule_key: 'MISSING_TEST', severity: 'MAJOR', brief_lowered_from: 'MAJOR' };
  assert.equal(illegal(reviewer), true, 'brief_lowered_from on an unmarked reviewer finding');
});

test('illegalBriefLowering — a marked engine finding with an unknown or missing rule_key is true', () => {
  assert.equal(illegal(codeReviewDefect({ rule_key: 'NOT_A_KEY', contradicts_brief: NON_GOAL })), true);
  assert.equal(illegal(codeReviewDefect({ rule_key: undefined, contradicts_brief: NON_GOAL })), true);
});

test('illegalBriefLowering — contradicts_brief: true (not a string) on the otherwise legal shape is true', () => {
  assert.equal(illegal(legalShape({ contradicts_brief: true })), true);
});

test('illegalBriefLowering — an unmarked engine finding below its tier is true', () => {
  const sec = {
    id: 'c'.repeat(40), file: 'lib/auth.mjs', line: 9, rule_key: 'SECURITY_REVIEW_VULNERABILITY',
    severity: 'MINOR', engine: 'security-review',
  };
  assert.equal(illegal(sec), true, 'unmarked /security-review SECURITY_REVIEW_VULNERABILITY at MINOR');
  assert.equal(illegal(codeReviewDefect({ severity: 'MINOR' })), true, 'unmarked /code-review CODE_REVIEW_DEFECT at MINOR');
});

test('illegalBriefLowering — false for engine findings at their tier and for unmarked reviewer findings', () => {
  assert.equal(illegal(codeReviewDefect({ contradicts_brief: NON_GOAL })), false, 'a marked engine finding at its tier');
  assert.equal(illegal(codeReviewDefect()), false, 'an unmarked engine finding at its tier');
  const reviewer = { id: 'b'.repeat(40), file: 'lib/b.mjs', line: 7, rule_key: 'MISSING_TEST' };
  assert.equal(illegal({ ...reviewer, severity: 'MINOR' }), false,
    'an unmarked reviewer MISSING_TEST at MINOR without brief_lowered_from (the quick-mode shape)');
  assert.equal(illegal({ ...reviewer, severity: 'BLOCKER' }), false,
    'an unmarked reviewer MISSING_TEST asserted BLOCKER (above its tier)');
});

// ---- review → plan handover --------------------------------------------------

test('review → plan handover — the lowered finding is left out by /trekplan\'s severity filter', () => {
  const prose = readFileSync(join(ROOT, 'commands', 'trekplan.md'), 'utf-8');
  const line = prose.split('\n').find((l) => l.includes('Filter findings to severity'));
  assert.ok(line, 'commands/trekplan.md carries the "Filter findings to severity" line');
  const set = line.match(/\{([^}]*)\}/);
  assert.ok(set, 'the filter line names a {…} severity set');
  const severities = new Set(set[1].split(',').map((s) => s.trim()));
  assert.deepEqual([...severities].sort(), ['BLOCKER', 'MAJOR']);

  const lowered = m.runContract(payload('claude-code-review', [codeReviewDefect({ contradicts_brief: NON_GOAL })]));
  assert.equal(lowered.findings.filter((f) => severities.has(f.severity)).length, 0,
    'a brief-lowered finding does not become a plan goal');
  const unmarked = m.runContract(payload('claude-code-review', [codeReviewDefect()]));
  assert.equal(unmarked.findings.filter((f) => severities.has(f.severity)).length, 1,
    'known-positive control: the same finding unmarked does');
});

// ---- the verdict gate --------------------------------------------------------

function runGate(path) {
  return spawnSync(process.execPath, [GATE, path], { encoding: 'utf-8' });
}

test('verdict gate — exit 0 on the legal brief lowering', () => {
  assert.ok(existsSync(LEGAL_FIXTURE), 'tests/fixtures/review-brief-conflict-legal.md exists');
  const r = runGate(LEGAL_FIXTURE);
  assert.equal(r.status, 0, `legal lowering must pass: ${r.stdout}${r.stderr}`);
});

test('verdict gate — exit 2 on the illegal brief lowering, the reason naming the finding id', () => {
  assert.ok(existsSync(ILLEGAL_FIXTURE), 'tests/fixtures/review-brief-conflict-illegal.md exists');
  const text = readFileSync(ILLEGAL_FIXTURE, 'utf-8');
  const json = JSON.parse(text.slice(text.lastIndexOf('```json') + 7, text.lastIndexOf('```')));
  assert.equal(json.verdict, 'ALLOW', 'the fixture claims ALLOW');
  const id = json.findings[0].id;
  assert.match(id, /^[0-9a-f]{40}$/);
  const r = runGate(ILLEGAL_FIXTURE);
  assert.equal(r.status, 2, `a marked reviewer finding must be refused: ${r.stdout}${r.stderr}`);
  assert.ok(r.stdout.includes(id), `the reason names the finding id ${id}: ${r.stdout}`);
});

test('verdict gate — imports illegalBriefLowering from coordinator-contract.mjs (the rule lives once)', () => {
  const src = readFileSync(GATE, 'utf-8');
  assert.match(src,
    /^import\s*\{[^}]*\billegalBriefLowering\b[^}]*\}\s*from\s*['"]\.\/coordinator-contract\.mjs['"]/m,
    'verdict-gate.mjs must import illegalBriefLowering from ./coordinator-contract.mjs');
  assert.doesNotMatch(src, /function\s+illegalBriefLowering\b/,
    'verdict-gate.mjs must not carry its own copy of the rule');
});

// ---- the prose states the same rule (Step 10) --------------------------------
//
// The coordinator is a model reading agents/review-coordinator.md; the gate
// above enforces the rule on what it writes. These pins keep the prose saying
// the same rule the code enforces. Every pin reads a bounded cut, never the
// whole file, so a phrase elsewhere in the file cannot satisfy it.

const readDoc = (...rel) => readFileSync(join(ROOT, ...rel), 'utf-8');

/** The text from `startMarker` up to (not including) the first `endMarker` after it. */
function cut(text, startMarker, endMarker, label) {
  const start = text.indexOf(startMarker);
  assert.ok(start >= 0, `${label}: start marker missing: ${JSON.stringify(startMarker)}`);
  const end = text.indexOf(endMarker, start + startMarker.length);
  assert.ok(end > start, `${label}: end marker ${JSON.stringify(endMarker)} missing after the start`);
  return text.slice(start, end);
}

/** The sentence from `startPhrase` to its full stop (the first '.' after it). */
function sentenceFrom(text, startPhrase, label) {
  const start = text.indexOf(startPhrase);
  assert.ok(start >= 0, `${label}: sentence start missing: ${JSON.stringify(startPhrase)}`);
  const stop = text.indexOf('.', start + startPhrase.length);
  assert.ok(stop > start, `${label}: the sentence has no full stop`);
  return text.slice(start, stop + 1);
}

/** One hard-rule bullet, from its bold lead to the next bullet. */
function hardRule(coord, lead) {
  const at = coord.indexOf('\n## Hard rules');
  assert.ok(at >= 0, 'the ## Hard rules section exists');
  const rules = coord.slice(at);
  return cut(`${rules}\n- **`, `- **${lead}**`, '\n- **', `hard rule "${lead}"`);
}

test('trekreview Phase 6 — passes the brief\'s Non-Goals, Constraints, Preferences and Open Questions decisions to the coordinator', () => {
  const cmd = readDoc('commands', 'trekreview.md');
  const p6 = cut(cmd, '## Phase 6 — Coordinator dedup + verdict', '\n## ', 'Phase 6');
  for (const section of ['`## Non-Goals`', '`## Constraints`', '`## Preferences`', '`## Open Questions / Assumptions`']) {
    assert.ok(p6.includes(section), `Phase 6 names the brief section ${section}`);
  }
  assert.match(p6, /operator decisions in `## Open Questions \/ Assumptions`/, 'only the operator decisions of Open Questions');
  assert.match(p6, /verbatim/, 'the choices are passed verbatim');
  assert.match(p6, /brief choices/i, 'Phase 6 names the input the coordinator reads');
});

test('trekreview workflow path — engine, contradicts_brief and brief_lowered_from are carried into review.md', () => {
  const cmd = readDoc('commands', 'trekreview.md');
  const wf = cut(cmd, 'Then continue at **Phase 7**', '\n\n', 'workflow paragraph');
  for (const field of ['`engine`', '`contradicts_brief`', '`brief_lowered_from`']) {
    assert.ok(wf.includes(field), `the workflow paragraph names ${field}`);
  }
  assert.match(wf, /review\.md/, 'the fields are written into review.md');
});

test('review-coordinator Input — names "Brief choices" (the four sections) and the mode line names the exception', () => {
  const coord = readDoc('agents', 'review-coordinator.md');
  const input = cut(coord, '## Input', '\n## Your 4-pass process', 'Input');
  assert.match(input, /\*\*Brief choices\*\*/);
  const choices = cut(input, '**Brief choices**', '\n- **', 'Brief choices bullet');
  for (const section of ['`## Non-Goals`', '`## Constraints`', '`## Preferences`', '`## Open Questions / Assumptions`']) {
    assert.ok(choices.includes(section), `Brief choices names ${section}`);
  }
  assert.match(choices, /verbatim/);
  const mode = cut(input, '- **Mode**', '\n- **', 'mode line');
  assert.match(mode, /except the brief-conflict rule, which applies in every mode/);
});

test('review-coordinator Pass 3 — only an engine finding is marked, and the one lowering needs severity MAJOR', () => {
  const coord = readDoc('agents', 'review-coordinator.md');
  const p3 = cut(coord, '### Pass 3', 'In `quick` mode', 'Pass 3');
  assert.match(p3, /`contradicts_brief: "<verbatim>"`/, 'the mark carries the Non-Goal or choice verbatim');
  assert.match(p3, /engine finding \(`engine: code-review` or `security-review`\)/, 'only an engine finding is marked');
  assert.match(p3, /only an engine finding is ever marked/);
  assert.match(p3, /only a `\/code-review` finding at the MAJOR tier and at severity MAJOR then drops to MINOR, with `brief_lowered_from: MAJOR`/,
    'the one lowering, severity MAJOR required');
  assert.match(p3, /a BLOCKER-tier, a MINOR-tier and any `\/security-review` finding only get the mark/);
  assert.match(p3, /no engine finding is otherwise written below its catalogue tier/);
  assert.match(p3, /`engine` is written only on a finding whose kept Pass 1 survivor itself came from an engine payload/);
  assert.match(p3, /a reviewer-agent finding \(no `engine`\) and a finding whose `rule_key` is not in the catalogue are never marked/);
  assert.match(p3, /not the rule key `NON_GOAL_VIOLATED`/);
  assert.ok(p3.includes('the brief-conflict reason (`contradicts_brief`), a field, never a `suppressed_reason`'),
    'the mark is named as a field, never a suppression reason');
  assert.match(p3, /verdict gate refuses \(exit 2\) every other marked or lowered shape/);
});

test('review-coordinator — quick mode and high-effort normalization each still apply the brief-conflict rule', () => {
  const coord = readDoc('agents', 'review-coordinator.md');
  const pass3 = coord.indexOf('### Pass 3');
  assert.ok(pass3 >= 0, 'Pass 3 heading');
  const quick = cut(coord.slice(pass3), 'In `quick` mode, skip this pass entirely.', '\n\n', 'quick-mode paragraph');
  assert.match(quick, /brief-conflict rule[^.]*still applies/, 'the quick-mode paragraph says the rule still applies');
  const high = cut(coord, '**High-effort normalization (v5.1.1):**', '\n### ', 'high-effort paragraph');
  assert.match(high, /brief-conflict rule[^.]*still applies/, 'the high-effort paragraph says the rule still applies');
});

test('review-coordinator Pass 2 — the trim rule judges a lowerable brief conflict as MINOR, inside its own sentence', () => {
  const coord = readDoc('agents', 'review-coordinator.md');
  const s = sentenceFrom(coord, 'The trim decision reads the **catalogue** tier', 'trim rule');
  assert.match(s, /except a lowerable brief conflict, which is judged as MINOR \(decide the mark before trimming\)/);
  assert.match(s, /so a mislabelled MAJOR is never cut\.$/, 'the sentence still ends on its own guarantee');
});

test('review-coordinator hard rules — the brief re-evaluation, the severity floor and quick mode each name the exception', () => {
  const coord = readDoc('agents', 'review-coordinator.md');
  assert.match(hardRule(coord, 'Bounded operations only.'), /brief-conflict rule/,
    '"You do NOT re-evaluate findings against the brief" names its one exception');
  assert.match(hardRule(coord, 'Severity floor is the catalogue.'), /except a lowerable brief conflict, which is MINOR/);
  assert.match(hardRule(coord, 'Quick mode is documented.'), /except the brief-conflict rule, which applies in every mode/);
});

test('review-coordinator output — the field list and the trailing JSON example carry engine, contradicts_brief, brief_lowered_from', () => {
  const coord = readDoc('agents', 'review-coordinator.md');
  const fields = cut(coord, 'Each Findings subsection uses the', '### Trailing JSON block', 'field list');
  assert.ok(fields.includes('- `- engine: {code-review | security-review, when the finding came from an engine}`'));
  assert.ok(fields.includes('- `- contradicts_brief: {verbatim Non-Goal or choice, only when set}`'));
  assert.ok(fields.includes('- `- brief_lowered_from: {MAJOR, only when lowered for the brief}`'));
  assert.ok(!fields.includes('original_severity'), 'the brief rule does not read original_severity');

  const block = coord.match(/### Trailing JSON block\n\nThe LAST fenced block in the file is a `json` block:\n\n```json\n([\s\S]*?)\n```/);
  assert.ok(block, 'the trailing JSON example is present');
  const objects = block[1].match(/\{[^{}]*\}/g) ?? [];
  const lowered = objects.find((o) => /"brief_lowered_from":\s*"MAJOR"/.test(o));
  assert.ok(lowered, 'the JSON example shows a finding with brief_lowered_from');
  assert.match(lowered, /"engine":\s*"code-review"/);
  assert.match(lowered, /"contradicts_brief":\s*"[^"]+"/);
  assert.match(lowered, /"severity":\s*"MINOR"/);
  assert.match(lowered, /"rule_key":\s*"CODE_REVIEW_DEFECT"/);
});

test('Handover 6 — names the fields, engine findings only, the one lowering and the five shapes the gate refuses', () => {
  const contracts = readDoc('docs', 'HANDOVER-CONTRACTS.md');
  const h6 = cut(contracts, '## Handover 6 — `review.md` → plan', '\n## Handover 7', 'Handover 6');
  for (const field of ['`engine`', '`contradicts_brief`', '`brief_lowered_from`']) {
    assert.ok(h6.includes(field), `Handover 6 names ${field}`);
  }
  assert.match(h6, /only an engine finding is (?:ever )?marked/i, 'engine findings only');
  assert.match(h6, /`\/code-review` MAJOR-tier finding[^.]*MINOR[^.]*`brief_lowered_from: MAJOR`/, 'the one legal lowering');
  assert.match(h6, /exits 2/);
  const shapes = [
    /any other `brief_lowered_from`/,
    /a mark on a reviewer-agent finding/,
    /a marked finding below its tier/,
    /a marked finding with an unknown key/,
    /an engine finding below its tier, marked or not/,
  ];
  for (const shape of shapes) assert.match(h6, shape, `Handover 6 names the refused shape ${shape}`);
  assert.match(h6, /cannot check an `engine` label on the prose path/);
  assert.match(h6, /skips a lowered finding/, 'a plan made from the review skips a lowered (MINOR) finding');
});

// ---- Decision 13 (operator 12.10): the source decides, a tie keeps the reviewer --
//
// "Came from an engine" is read from the payload a finding arrived in, never
// from an `engine` field a reviewer wrote on its own finding; and on a severity
// tie a reviewer-agent finding survives over an engine finding, so an engine's
// mark can never lower what a reviewer agent asserted, whatever the order.

function reviewerCopy(extra = {}) {
  const { engine: _e, ...rest } = codeReviewDefect({ title: 'Reviewer: no retry', ...extra });
  return rest;
}

test('decision 13 — a reviewer payload whose finding labels itself engine code-review is not lowered', () => {
  const f = codeReviewDefect({ contradicts_brief: NON_GOAL });
  const result = m.runContract(payload('code-correctness-reviewer', [f]));
  const out = result.findings[0];
  assert.equal(out.severity, 'MAJOR', 'a reviewer MAJOR is never lowered by the brief rule');
  assert.equal('brief_lowered_from' in out, false);
  assert.equal('engine' in out, false, 'engine comes from the payload source, not the field');
  assert.equal('contradicts_brief' in out, false, 'only an engine finding is ever marked');
  assert.equal(result.verdict, 'WARN');
  assertAllOutputLegal(result);
});

test('decision 13 — an engine payload decides the engine: a /security-review payload finding labelled code-review keeps its severity', () => {
  const f = codeReviewDefect({ contradicts_brief: NON_GOAL });
  const result = m.runContract(payload('claude-security-review', [f]));
  const out = result.findings[0];
  assert.equal(out.engine, 'security-review');
  assert.equal(out.severity, 'MAJOR');
  assert.equal('brief_lowered_from' in out, false);
  assert.equal(out.contradicts_brief, NON_GOAL, 'the mark is kept on an engine finding');
  assertAllOutputLegal(result);
});

for (const order of ['reviewer first', 'engine first']) {
  test(`decision 13 — a tie between a marked /code-review MAJOR and a reviewer MAJOR keeps the reviewer (${order}) → WARN`, () => {
    const reviewerPayload = { reviewer: 'code-correctness-reviewer', findings: [reviewerCopy({ rule_key: 'MISSING_TEST' })] };
    const enginePayload = { reviewer: 'claude-code-review', findings: [codeReviewDefect({ rule_key: 'MISSING_TEST', contradicts_brief: NON_GOAL })] };
    const payloads = order === 'reviewer first' ? [reviewerPayload, enginePayload] : [enginePayload, reviewerPayload];
    const result = m.runContract(payloads);
    assert.equal(result.findings.length, 1);
    const out = result.findings[0];
    assert.equal(out.severity, 'MAJOR', 'the reviewer agent asserted MAJOR; the engine mark cannot lower it');
    assert.equal('brief_lowered_from' in out, false);
    assert.equal('engine' in out, false, 'the survivor is the reviewer finding');
    assert.equal('contradicts_brief' in out, false);
    assert.deepEqual([...out.raised_by].sort(), ['claude-code-review', 'code-correctness-reviewer']);
    assert.equal(result.verdict, 'WARN');
    assertAllOutputLegal(result);
  });
}

test('decision 13 — an engine MAJOR over a reviewer MINOR on the same triplet still drops to MINOR (the engine wins on severity)', () => {
  const result = m.runContract([
    { reviewer: 'code-correctness-reviewer', findings: [reviewerCopy({ rule_key: 'MISSING_TEST', severity: 'MINOR' })] },
    { reviewer: 'claude-code-review', findings: [codeReviewDefect({ rule_key: 'MISSING_TEST', contradicts_brief: NON_GOAL })] },
  ]);
  const out = result.findings[0];
  assert.equal(out.engine, 'code-review');
  assert.equal(out.severity, 'MINOR');
  assert.equal(out.brief_lowered_from, 'MAJOR');
  assert.equal(result.verdict, 'ALLOW');
  assertAllOutputLegal(result);
});

test('decision 13 — the prose states the tie rule (coordinator Pass 1, Handover 6)', () => {
  const coordinator = readDoc('agents', 'review-coordinator.md');
  const pass1 = cut(coordinator, '### Pass 1', '### Pass 2', 'coordinator Pass 1');
  assert.match(pass1, /prefer\s+a\s+reviewer-agent\s+finding\s+over\s+an\s+engine\s+finding/,
    'Pass 1: a tie keeps the reviewer-agent finding');
  assert.match(pass1, /never\s+lowers\s+what\s+a\s+reviewer\s+agent\s+asserted/);
  const h6 = cut(readDoc('docs', 'HANDOVER-CONTRACTS.md'), '## Handover 6 — `review.md` → plan', '\n## Handover 7', 'Handover 6');
  assert.match(h6, /takes? `engine` from the payload a finding arrived in/);
  assert.match(h6, /on a severity tie[^.]*a reviewer-agent finding survives[^.]*over an engine finding/i);
});