fix(#3210): gate unmet preconditions as blocking-human; cap blocker retries at needs_human (#3528)

* fix(#3210): gate unmet preconditions as blocking-human and cap blocker retries at needs_human

* chore(#3210): add changeset fragment for PR #3528

* fix(#3210): restore blocking-human carve-out and CRLF-safe split

---------

Co-authored-by: sim <sim@local>

tests/execute-phase-wave.test.cjs

@@ -908,3 +908,30 @@ describe('bug #3096: ai-integration-phase sequential ordering and Edit-only disc
 });
   });
 }
+
+// ─── Issue #3210: auto-mode carve-out exempts precondition-unmet checkpoints ─
+//
+// The checkpoint_handling auto-spawn rule dispatched on checkpoint type alone;
+// a checkpoint returned because a task's <precondition> was unmet would have
+// been auto-approved with a synthetic "approved" — re-approving the very
+// checkpoint the executor refused to auto-approve (it reports Gate:
+// blocking-human). This file owns the execute-phase.md host-workflow contract.
+
+describe('issue #3210: execute-phase auto-mode carve-out exempts precondition-unmet checkpoints', () => {
+  test('the checkpoint_handling auto-spawn rule names precondition-unmet checkpoints', () => {
+    const content = fs.readFileSync(WORKFLOW_PATH, 'utf-8');
+    const open = content.indexOf('<step name="checkpoint_handling">');
+    assert.ok(open !== -1, 'checkpoint_handling step not found');
+    const close = content.indexOf('</step>', open);
+    const step = content.slice(open, close);
+    const splitLines = require('../gsd-core/bin/lib/text-lines.cjs').splitLines;
+    const carveOut = splitLines(step).find((l) => l.includes('Carve-out'));
+    assert.ok(carveOut, 'checkpoint_handling must keep the blocking-human carve-out');
+    assert.match(
+      carveOut,
+      /precondition/i,
+      'the auto-mode carve-out must state that a precondition-unmet checkpoint reports ' +
+      'blocking-human and is never auto-approved (#3210)'
+    );
+  });
+});