diff --git a/.gitignore b/.gitignore
index 6074f74..a90ddda 100644
--- a/.gitignore
+++ b/.gitignore
@@ -16,11 +16,20 @@ output/.github-security-coverage-latest.json.lock
 output/.portfolio-truth-latest.json.lock
 # Local run output written by PortfolioCommandCenter before truth publication.
 output/pcc-auditor-run.log
+# Staging and rollback copies of the generated artifacts above.
+output/tmp*.json.tmp
+output/tmp*.json.bak
+output/tmp*.md.tmp
+output/tmp*.md.bak
 # Generated private portfolio dumps written to the repo ROOT (chmod 600). The
 # output/*.md rule above does not cover root-level files, so name them explicitly
 # to keep a stray `git add -A` from committing private portfolio data.
 /PORTFOLIO-AUDIT-REPORT.md
 /project-registry.md
+/tmp*.project-registry.md.tmp
+/tmp*.project-registry.md.bak
+/tmp*.PORTFOLIO-AUDIT-REPORT.md.tmp
+/tmp*.PORTFOLIO-AUDIT-REPORT.md.bak
 output/PORTFOLIO.md
 !output/.gitkeep
 config/notion-config.json
diff --git a/tests/test_producer_preflight.py b/tests/test_producer_preflight.py
index 74e5944..2708307 100644
--- a/tests/test_producer_preflight.py
+++ b/tests/test_producer_preflight.py
@@ -73,6 +73,8 @@ def test_canonical_producer_fails_dirty_worktree(tmp_path: Path) -> None:
 def test_publication_runtime_files_preserve_clean_producer(tmp_path: Path) -> None:
     from github_repo_auditor.portfolio_truth_publish import (
         _portfolio_truth_publication_lock,
+        _stage_bytes,
+        _stage_text,
     )
 
     repo, _ = _repo(tmp_path)
@@ -95,9 +97,19 @@ def test_publication_runtime_files_preserve_clean_producer(tmp_path: Path) -> No
     output.mkdir()
     (output / "pcc-auditor-run.log").write_text("running\n")
     with _portfolio_truth_publication_lock(output / "portfolio-truth-latest.json"):
+        targets = [
+            output / "portfolio-truth-latest.json",
+            output / "project-registry.json",
+            output / "portfolio-truth-latest.md",
+            repo / "project-registry.md",
+            repo / "PORTFOLIO-AUDIT-REPORT.md",
+        ]
+        staged = [_stage_text(target, "{}\n") for target in targets]
+        backups = [_stage_bytes(target, b"{}\n") for target in targets]
         verify_evidence_still_current(repo, result.evidence)
     verify_evidence_still_current(repo, result.evidence)
     assert (output / ".portfolio-truth-latest.json.lock").is_file()
+    assert all(path.is_file() for path in staged + backups)
 
     (output / "unexpected-source.py").write_text("changed = True\n")
     with pytest.raises(ValueError, match="worktree"):