test(#1973): consolidate 48 workflow regression tests into workflow-aspect suites

Fold 48 issue-named workflow-markdown regression files into the canonical test
that owns each workflow aspect (execute-phase-*, plan-phase-*, quick-*, discuss-*,
worktree-cleanup, secure-phase, verify, update, settings, etc.), across 32 existing
suites. Verbatim block-scoped describe wrappers; 281 subtests conserved 1:1. No new
test files. Host-env pre-check: only gsd-settings-advanced spawns CLI and it sets no
GSD_WORKSTREAM/GSD_PROJECT value — no leak risk.

Regenerates regression-name allowlist (222->181), ratchets file-count allowlist
(verify 11->10), makes 30 relocated allow-test-rule exemptions issue-ref-compliant
(ADR-456; prunes 30 stale ids). lint:ci green.

Part of epic #1969. Closes #1973.

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

tests/reapply-patches.test.cjs

@@ -514,3 +514,135 @@ describe('reapply-patches pristine baseline detection (#2424)', () => {
 });
   });
 }
+
+// ────────────────────────────────────────────────────────────────────────
+// Folded from tests/bug-3516-reapply-patches-gsd-update-filter.test.cjs — consolidation epic #1969 (B4 #1973)
+// ────────────────────────────────────────────────────────────────────────
+{
+  const { describe: __foldDescribe } = require('node:test');
+  __foldDescribe("folded:bug-3516-reapply-patches-gsd-update-filter (consolidation epic #1969 B4 #1973)", () => {
+// allow-test-rule: source-text-is-the-product (see #3516)
+// gsd-core/workflows/reapply-patches.md is the installed runtime workflow —
+// its text IS the deployed behavioral contract for the --reapply flag.
+
+'use strict';
+
+/**
+ * Bug #3516: reapply-patches.md git-enhanced two-way merge filter misses
+ * commits authored by the renamed `/gsd-update` flow.
+ *
+ * The `grep -v` alternation on line 231 only included the legacy `gsd:update`
+ * marker. After the slash-command rename `/gsd:update` → `/gsd-update`, commits
+ * authored by the current flow fall through the filter and are misclassified as
+ * user customizations, prompting spurious merge conflicts during `--reapply`.
+ *
+ * Fix: add `gsd-update` arm to the alternation so both the legacy and current
+ * commit-message prefixes are excluded. `GSD update` and `gsd-install`
+ * exclusions are preserved.
+ *
+ * Per the repo's source-text-is-the-product exception: the workflow file's text
+ * IS the deployed behavioral contract. Structural assertion against the parsed
+ * shell command string is the correct test form here.
+ */
+
+const { describe, test, before } = require('node:test');
+const assert = require('node:assert/strict');
+const fs = require('node:fs');
+const path = require('node:path');
+
+const WORKFLOW_PATH = path.join(
+  __dirname,
+  '..',
+  'gsd-core',
+  'workflows',
+  'reapply-patches.md',
+);
+
+/**
+ * Extract the git log filter command from the workflow.
+ *
+ * Looks for the `grep -v "..."` shell snippet inside the Git-enhanced two-way
+ * merge section and returns the alternation string between the quotes.
+ * Returns null if the snippet is absent (signals a structural regression).
+ */
+function extractFilterAlternation(content) {
+  // Match the grep -v "..." line in the bash block
+  const match = content.match(/grep\s+-v\s+"([^"]+)"/);
+  if (!match) return null;
+  return match[1];
+}
+
+/**
+ * Parse the alternation string (pipe-delimited) into individual arms.
+ * Handles escaped pipes produced by shell regex syntax (`\|`).
+ */
+function parseAlternationArms(alternation) {
+  // Shell grep alternation uses \| (escaped pipe); split on that
+  return alternation.split(/\\\|/).map((arm) => arm.trim());
+}
+
+describe('Bug #3516: git-enhanced two-way merge filter includes gsd-update arm', () => {
+  let content;
+  let alternation;
+  let arms;
+
+  before(() => {
+    content = fs.readFileSync(WORKFLOW_PATH, 'utf8');
+    alternation = extractFilterAlternation(content);
+    arms = alternation ? parseAlternationArms(alternation) : [];
+  });
+
+  test('workflow file exists', () => {
+    assert.ok(
+      fs.existsSync(WORKFLOW_PATH),
+      'gsd-core/workflows/reapply-patches.md must exist',
+    );
+  });
+
+  test('git-enhanced two-way merge section contains a grep -v filter', () => {
+    assert.ok(
+      alternation !== null,
+      'reapply-patches.md must contain a `grep -v "..."` filter in the git-enhanced two-way merge section',
+    );
+  });
+
+  test('filter excludes legacy gsd:update commits (back-compat)', () => {
+    assert.ok(
+      arms.some((arm) => arm === 'gsd:update'),
+      `filter must include 'gsd:update' arm for back-compat; got arms: ${JSON.stringify(arms)}`,
+    );
+  });
+
+  test('filter excludes renamed gsd-update commits (primary fix)', () => {
+    assert.ok(
+      arms.some((arm) => arm === 'gsd-update'),
+      `filter must include 'gsd-update' arm (renamed flow); got arms: ${JSON.stringify(arms)}`,
+    );
+  });
+
+  test('filter excludes GSD update commits (no regression)', () => {
+    assert.ok(
+      arms.some((arm) => arm === 'GSD update'),
+      `filter must include 'GSD update' arm; got arms: ${JSON.stringify(arms)}`,
+    );
+  });
+
+  test('filter excludes gsd-install commits (no regression)', () => {
+    assert.ok(
+      arms.some((arm) => arm === 'gsd-install'),
+      `filter must include 'gsd-install' arm; got arms: ${JSON.stringify(arms)}`,
+    );
+  });
+
+  test('all four expected exclusion patterns are present in the filter', () => {
+    const required = ['gsd:update', 'gsd-update', 'GSD update', 'gsd-install'];
+    const missing = required.filter((p) => !arms.some((arm) => arm === p));
+    assert.deepEqual(
+      missing,
+      [],
+      `filter is missing required exclusion patterns: ${JSON.stringify(missing)}; got arms: ${JSON.stringify(arms)}`,
+    );
+  });
+});
+  });
+}