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/research-agent-profiles.test.cjs

@@ -432,3 +432,90 @@ describe('gsd-project-researcher agent registration (#2419)', () => {
 });
   });
 }
+
+// ────────────────────────────────────────────────────────────────────────
+// Folded from tests/bug-2559-stale-search-year.test.cjs — consolidation epic #1969 (B8 #1977)
+// ────────────────────────────────────────────────────────────────────────
+{
+  const { describe: __foldDescribe } = require('node:test');
+  __foldDescribe("folded:bug-2559-stale-search-year (consolidation epic #1969 B8 #1977)", () => {
+// allow-test-rule: source-text-is-the-product (see #2559)
+// Workflow .md / agent .md / command .md / reference .md files — their text
+// IS what the runtime loads. Testing text content tests the deployed contract.
+// Per CONTRIBUTING.md exception matrix.
+
+/**
+ * Bug #2559: Stale document references in Research phase
+ *
+ * The gsd-phase-researcher and gsd-project-researcher agents instruct
+ * WebSearch queries to always include "current year" (or a hardcoded
+ * year). This biases results toward stale dated content as time passes
+ * (e.g., a 2024 query run in 2026 returns stale results).
+ *
+ * Fix: Remove year-injection instructions from research agent
+ * WebSearch guidance so searches return current results.
+ */
+
+const { describe, test } = require('node:test');
+const assert = require('node:assert/strict');
+const fs = require('fs');
+const path = require('path');
+
+const PHASE_RESEARCHER = path.join(
+  __dirname,
+  '..',
+  'agents',
+  'gsd-phase-researcher.md'
+);
+const PROJECT_RESEARCHER = path.join(
+  __dirname,
+  '..',
+  'agents',
+  'gsd-project-researcher.md'
+);
+
+const FILES = [
+  { label: 'gsd-phase-researcher.md', path: PHASE_RESEARCHER },
+  { label: 'gsd-project-researcher.md', path: PROJECT_RESEARCHER },
+];
+
+describe('research agents do not inject year into web searches (#2559)', () => {
+  for (const { label, path: filePath } of FILES) {
+    test(`${label} contains no CURRENT_YEAR placeholder`, () => {
+      const content = fs.readFileSync(filePath, 'utf-8');
+      assert.ok(
+        !/CURRENT_YEAR/.test(content),
+        `${label} must not contain CURRENT_YEAR placeholder (causes stale-year injection)`
+      );
+    });
+
+    test(`${label} contains no hardcoded year in web search instructions`, () => {
+      const content = fs.readFileSync(filePath, 'utf-8');
+      const match = content.match(/\b20(2[3-9]|[3-9]\d)\b/);
+      assert.ok(
+        !match,
+        `${label} must not contain hardcoded year (found "${match && match[0]}") — biases searches toward stale content`
+      );
+    });
+
+    test(`${label} does not instruct searches to include year or current year`, () => {
+      const content = fs.readFileSync(filePath, 'utf-8');
+      // Match phrases like "include current year", "year in searches",
+      // "[current year]", "with year", etc.
+      const patterns = [
+        /include\s+(?:the\s+)?current\s+year/i,
+        /current\s+year/i,
+        /year\s+in\s+(?:searches|queries)/i,
+        /\[current year\]/i,
+      ];
+      for (const pat of patterns) {
+        assert.ok(
+          !pat.test(content),
+          `${label} must not instruct year injection (matched /${pat.source}/)`
+        );
+      }
+    });
+  }
+});
+  });
+}