fix(tests): mock OSError for Gradle test (root in CI) and move changelog entry

- test_unreadable_settings_gradle: use monkeypatch instead of chmod
  (CI runs as root, bypassing file permissions)
- Move "Per-session transcript sync" from Changed to Training data
  pipeline subsection per user request

Signed-off-by: jgstern-agent <josh-agent@iterabloom.com>

Author: jgstern-agent

.ci/affected-tests.txt

@@ -1,5 +1,5 @@
 # Test selection manifest
-# Generated by smart-test at 2026-04-12T04:44:45-04:00
+# Generated by smart-test at 2026-04-12T04:55:12-04:00
 # Mode: targeted
 # Baseline: 4a043784bfa0467b7ffc73af361527d47e25da31
 # Changed files: 10

CHANGELOG.md

@@ -12,7 +12,6 @@ This changelog tracks the **tool version** (package releases). The **schema vers
 
 ### Changed
 
-- **Per-session transcript sync** (ADR-0018 amendment, INV-filaj): concurrent sessions now write to isolated files keyed by `session_id` instead of racing on shared state. Session-end rotation atomically promotes files into `.last_*`/`.second_to_last_*` slots. Cursor exempted via sibling check; injection-history sidecar tracks playbook events.
 - **Stop hook relaxed on CONVERGED bakeoffs** (WI-bibul): guidance now leads with `tracker ready` instead of requiring reflect/aggregate when bakeoff is converged.
 - **Bakeoff-deep hub-collision warning** (WI-gapom): `pick_reverse_slice_seeds` warns on seeds with `prod_in_degree > 1000`.
 - **`io-boundaries` defaults to production-only** (WI-sifif): test chains excluded by default (was 78% noise). `--include-tests` opts back in.
@@ -65,6 +64,7 @@ This changelog tracks the **tool version** (package releases). The **schema vers
 
 #### Training data pipeline
 
+- **Per-session transcript sync** (ADR-0018 amendment, INV-filaj): concurrent sessions now write to isolated files keyed by `session_id` instead of racing on shared state. Session-end rotation atomically promotes files into `.last_*`/`.second_to_last_*` slots. Cursor exempted via sibling check; injection-history sidecar tracks playbook events.
 - **v0 corpus cohort backfill** (WI-gigil): `backfill-training-data-cohort-tags.py` writes a sidecar with per-entry `infra_sha`, `playbook_registry_sha`, `main_llm_presumed`, and playbook counts. Re-runnable, non-destructive.
 - **Per-entry cohort metadata** (WI-tatuh / INV-gajap): `log_training_example` now writes `pipeline_version`, `infra_sha`, `playbook_registry_sha`, `main_llm`, `vendor`, `vendor_version`, and `scoring_model` on every entry. Distribution shifts discoverable from the corpus alone.
 - **Multi-vendor interjection normalization** (WI-nadud): `filter-transcript.py` emits `normalized_user_interjection` rows for user interjections across Claude Code, Codex CLI, and OpenHands. `pipeline_version` bumped to v2.

packages/hypergumbo-core/tests/test_supply_chain.py

@@ -644,18 +644,25 @@ def test_malformed_settings_gradle(self, tmp_path):
         # Should not crash; may or may not find roots depending on parsing
         assert isinstance(roots, set)
 
-    def test_unreadable_settings_gradle(self, tmp_path):
+    def test_unreadable_settings_gradle(self, tmp_path, monkeypatch):
         """Unreadable settings.gradle doesn't crash (OSError path)."""
         settings = tmp_path / "settings.gradle"
         settings.write_text("include 'core'\n")
         (tmp_path / "core").mkdir()
-        settings.chmod(0o000)
+
+        # Mock read_text to raise OSError (chmod doesn't work as root in CI)
+        original_read_text = Path.read_text
+
+        def _raise_on_settings(self, *args, **kwargs):
+            if self.name.startswith("settings.gradle"):
+                raise OSError("Permission denied")
+            return original_read_text(self, *args, **kwargs)
+
+        monkeypatch.setattr(Path, "read_text", _raise_on_settings)
 
         roots = detect_package_roots(tmp_path)
         # OSError on read → silently skipped, no Gradle roots detected
         assert tmp_path / "core" not in roots
-        # Restore permissions so tmp_path cleanup succeeds
-        settings.chmod(0o644)
 
     def test_settings_gradle_multiple_include_lines(self, tmp_path):
         """Multiple include lines are all parsed."""