fix(deploy): clear stale self-deploy markers on rollback; document env

Re-deploy after a FAILED prod deploy wedged the task on `deploy`: the
sentinel markers (approve-requested/initiated/result) are keyed by the
stable work_item_id, so after the БАГ-8 rollback (deploy -> development)
and a developer fix, Phase B's idempotency-guard saw a STALE `initiated`
and became a no-op — the detached hook never re-launched and the
finalizer was never enqueued. Add self_deploy.clear_state (never-raise,
idempotent) and call it on the check_deploy_status FAILED rollback and at
the start of Phase A, so every fresh prod-deploy pass starts clean.

Also document the new ORCH_SELF_DEPLOY_* / ORCH_DEPLOY_* descriptors in
the canonical .env.example (CLAUDE.md rule #8, ТЗ §2.6), modelled on the
ORCH-043 merge-gate block (placeholders only, secrets not committed).

Contracts untouched: STAGE_TRANSITIONS, QG_CHECKS, _parse_deploy_status,
БАГ-8, merge-gate.

Refs: ORCH-036
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

tests/test_deploy_rollback.py

@@ -98,3 +98,44 @@ def test_tc10_failed_deploy_rolls_back_to_development(monkeypatch):
     assert stage_engine.set_issue_blocked.called
     assert stage_engine.send_telegram.called
     assert stage_engine.set_issue_done.called is False
+
+
+def test_tc11_re_deploy_after_rollback_not_wedged(monkeypatch):
+    """FAILED deploy -> rollback wipes stale markers so a later Phase B re-initiates.
+
+    Regression for the re-deploy-after-rollback contract (AC-4/AC-10): markers are
+    keyed by the (stable) work_item_id, so without cleanup the STALE `initiated` from
+    the first failed attempt would make Phase B's idempotency-guard a no-op on the
+    retry and wedge the task on `deploy` forever.
+    """
+    repo, wi, branch = "orchestrator", "ORCH-036", "feature/ORCH-036-x"
+    # First (failed) pass left BOTH the idempotency-guard and the verdict behind.
+    self_deploy.write_marker(repo, wi, self_deploy.INITIATED, "123")
+    self_deploy.write_marker(repo, wi, self_deploy.RESULT, "1")
+    monkeypatch.setattr(
+        stage_engine, "QG_CHECKS",
+        {**stage_engine.QG_CHECKS, "check_deploy_status": _fail("Deploy status: FAILED")},
+    )
+    task_id = _make_task("deploy")
+
+    stage_engine.run_deploy_finalizer(
+        {"task_id": task_id, "repo": repo, "id": 1, "agent": "deploy-finalizer"}
+    )
+
+    # Rollback fired AND the stale deploy-state sentinels were wiped.
+    assert _stage(task_id) == "development"
+    assert self_deploy.has_marker(repo, wi, self_deploy.INITIATED) is False
+    assert self_deploy.has_marker(repo, wi, self_deploy.RESULT) is False
+    assert self_deploy.read_result(repo, wi) == (False, None)
+
+    # Second pass: the task reaches `deploy` again and the human re-approves. Phase B
+    # must ACTUALLY initiate (no stale `initiated` -> not a no-op), proving the retry
+    # is no longer wedged.
+    init = MagicMock(return_value=(True, "ok"))
+    monkeypatch.setattr(stage_engine.self_deploy, "initiate_deploy", init)
+    result = stage_engine.AdvanceResult(from_stage="deploy")
+    stage_engine._handle_self_deploy_phase_b(task_id, repo, wi, branch, result)
+
+    assert init.called
+    assert result.note == "self-deploy-initiated"
+    assert self_deploy.has_marker(repo, wi, self_deploy.INITIATED) is True