test(#1977): consolidate 22 misc + repo-invariant regression tests

Final epic-#1969 batch. Fold 22 issue-named files: the 4 genuine repo-wide invariant
scans (551-eslint-bin-lib-coverage, bug-3054 stale /gsd-next, bug-3810 no-gsd-sdk-runtime-refs,
feat-3593 cli-negative-universal) into a NEW shared repo-invariants.test.cjs; the other 18 as
singletons into their nearest module suite (model-resolver, codex-config, runtime-converters,
security, state-transition, worktree-safety, roadmap-parser, etc.). Verbatim block-scoped
describe wrappers; 334 subtests conserved 1:1.

Host-env pre-check (B2+B6): the 6 CLI folds into GSD_TEST_MODE-setting hosts (model-resolver/
codex-config/runtime-converters) are benign — each origin independently sets GSD_TEST_MODE=1
itself (idempotent), unlike the B6 real-install case.

Regenerates regression-name allowlist (222->213), ratchets file-count allowlist (state 17->16),
makes 7 relocated allow-test-rule exemptions issue-ref-compliant (ADR-456; prunes stale ids).
Repoints 2 tests/ refs in docs/TESTING-SUITES.md. lint:ci green.

Part of epic #1969. Closes #1977.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tests/milestone.test.cjs

@@ -992,3 +992,108 @@ describe('bug #2660: extractOneLinerFromBody', () => {
 });
   });
 }
+
+// ────────────────────────────────────────────────────────────────────────
+// Folded from tests/enh-72-business-context.test.cjs — consolidation epic #1969 (B8 #1977)
+// ────────────────────────────────────────────────────────────────────────
+{
+  const { describe: __foldDescribe } = require('node:test');
+  __foldDescribe("folded:enh-72-business-context (consolidation epic #1969 B8 #1977)", () => {
+// allow-test-rule: source-text-is-the-product (see #72)
+// The PROJECT.md template + complete-milestone workflow .md ARE the product surface
+// the runtime loads; asserting on their text tests the deployed contract directly.
+/**
+ * Enhancement #72 — optional Business Context section in the PROJECT.md template.
+ *
+ * Contract tests over the product-text surfaces (template + milestone workflow .md):
+ * the template offers a Business Context section that is explicitly OPTIONAL, capped
+ * at the four approved one-line fields, and the milestone evolution review treats it
+ * as conditional so non-business projects that deleted it are never forced to review it.
+ */
+const { test, describe } = require('node:test');
+const assert = require('node:assert/strict');
+const fs = require('fs');
+const path = require('path');
+
+const TEMPLATE = path.join(__dirname, '..', 'gsd-core', 'templates', 'project.md');
+const COMPLETE_MILESTONE = path.join(__dirname, '..', 'gsd-core', 'workflows', 'complete-milestone.md');
+
+function parseTemplateContract(content) {
+  const lines = content.split(/\r?\n/);
+  const lower = content.toLowerCase();
+  // The Business Context block lives between its heading and the next "## " heading.
+  const startIdx = lines.findIndex(l => l.trim() === '## Business Context');
+  let sectionBody = '';
+  if (startIdx !== -1) {
+    const rest = lines.slice(startIdx + 1);
+    const endOffset = rest.findIndex(l => l.startsWith('## '));
+    sectionBody = (endOffset === -1 ? rest : rest.slice(0, endOffset)).join('\n');
+  }
+  const fieldOf = (label) => new RegExp(`^- \\*\\*${label}\\*\\*:`, 'm').test(sectionBody);
+  return {
+    hasSection: startIdx !== -1,
+    // Optional-by-default: an HTML comment tells non-business projects to delete it.
+    hasOptionalMarker: /<!--\s*OPTIONAL/i.test(sectionBody) && /delete this section/i.test(sectionBody),
+    fields: {
+      customer: fieldOf('Customer'),
+      revenueModel: fieldOf('Revenue model'),
+      successMetric: fieldOf('Success metric'),
+      strategyNotes: fieldOf('Strategy notes'),
+    },
+    fieldCount: (sectionBody.match(/^- \*\*/gm) || []).length,
+    // Positioned between Core Value and Requirements.
+    orderedBetweenCoreValueAndRequirements:
+      lower.indexOf('## core value') < lower.indexOf('## business context') &&
+      lower.indexOf('## business context') < lower.indexOf('## requirements'),
+    hasGuidelinesEntry: /\*\*Business Context:\*\*/.test(content),
+  };
+}
+
+function parseMilestoneContract(content) {
+  const lower = content.toLowerCase();
+  const lines = content.split(/\r?\n/);
+  const reviewLine = lines.find(l =>
+    l.toLowerCase().includes('business context') &&
+    (l.toLowerCase().includes('if present') || l.toLowerCase().includes('only if')),
+  );
+  return {
+    mentionsBusinessContext: lower.includes('business context'),
+    hasConditionalReview: Boolean(reviewLine),
+  };
+}
+
+describe('enhancement #72 — Business Context template section', () => {
+  const tpl = parseTemplateContract(fs.readFileSync(TEMPLATE, 'utf-8'));
+
+  test('template includes a Business Context section', () => {
+    assert.ok(tpl.hasSection, 'template must contain a "## Business Context" section');
+  });
+
+  test('section is marked OPTIONAL with delete-for-non-business guidance', () => {
+    assert.ok(tpl.hasOptionalMarker, 'section must carry an OPTIONAL HTML comment telling non-business projects to delete it');
+  });
+
+  test('section carries exactly the four approved one-line fields', () => {
+    assert.ok(tpl.fields.customer, 'missing **Customer** field');
+    assert.ok(tpl.fields.revenueModel, 'missing **Revenue model** field');
+    assert.ok(tpl.fields.successMetric, 'missing **Success metric** field');
+    assert.ok(tpl.fields.strategyNotes, 'missing **Strategy notes** field');
+    assert.strictEqual(tpl.fieldCount, 4, 'section is capped at four fields (constraint reference, not a business plan)');
+  });
+
+  test('section is positioned between Core Value and Requirements', () => {
+    assert.ok(tpl.orderedBetweenCoreValueAndRequirements, 'Business Context must sit between Core Value and Requirements');
+  });
+
+  test('guidelines document the Business Context section', () => {
+    assert.ok(tpl.hasGuidelinesEntry, 'guidelines block must include a **Business Context:** entry');
+  });
+
+  test('milestone evolution reviews Business Context only when present', () => {
+    const ms = parseMilestoneContract(fs.readFileSync(COMPLETE_MILESTONE, 'utf-8'));
+    assert.ok(ms.mentionsBusinessContext, 'complete-milestone must mention Business Context in its review');
+    assert.ok(ms.hasConditionalReview, 'the Business Context milestone review must be conditional on the section being present');
+  });
+});
+  });
+}