Preserve preview harness, editor, email and task improvements

Snapshot current maintainer-preview application changes and regression fixtures for integration into lab. Excludes local runtime data, evaluation outputs and source backups. Focused Python regression selection: 140 passed; full suite not certified.

tests/test_inline_review_scope.py

@@ -0,0 +1,26 @@
+import pytest
+
+from src.clean_agent_preview import inline_suggestion_request
+
+
+@pytest.mark.parametrize('prompt', [
+    'Suggest a short message asking to postpone that event by two hours. Do not modify my calendar.',
+    'Suggest three names for a project.',
+    'Give feedback on this idea: a shared shopping list.',
+    'Review the pros and cons of postponing the meeting.',
+])
+def test_ordinary_advice_does_not_require_open_document(prompt):
+    assert not inline_suggestion_request(prompt, require_editor_reference=True)
+
+
+@pytest.mark.parametrize('prompt', [
+    'Give suggestions to this document.',
+    'Proofread the open document. Create inline suggestions only; do not apply changes.',
+    'Provide inline comments.',
+])
+def test_explicit_editor_review_still_requires_document(prompt):
+    assert inline_suggestion_request(prompt, require_editor_reference=True)
+
+
+def test_visible_editor_can_still_accept_short_review_request():
+    assert inline_suggestion_request('Proofread this.')