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_draft_contact_evidence.py

@@ -0,0 +1,37 @@
+import pytest
+
+from src.clean_agent_preview import draft_contact_evidence_error
+
+
+def check(args, observations=(), **kwargs):
+    return draft_contact_evidence_error('mcp__email__draft_email', args,
+        dependencies=('contacts',), executions=observations, **kwargs)
+
+
+def contact(**overrides):
+    return dict(tool='resolve_contact', execution_attempted=True, error=False,
+        blocked=False, output='Jonathan Amos <jonathan@example.com>', **overrides)
+
+
+def test_lookup_cannot_be_skipped():
+    assert check({'to': 'jonathan@invented.example'})
+
+
+def test_guessed_address_rejected_after_lookup():
+    assert check({'to': 'jonathan@invented.example'}, [contact()])
+
+
+def test_returned_address_and_explicit_cc_are_allowed():
+    assert check({'to': 'Jonathan <JONATHAN@example.com>', 'cc': 'sam@example.com'},
+                 [contact()], user_text='CC sam@example.com') is None
+
+
+@pytest.mark.parametrize('field', ['error', 'blocked'])
+def test_failed_lookup_does_not_ground_recipient(field):
+    observation = contact()
+    observation[field] = True
+    assert check({'to': 'jonathan@example.com'}, [observation])
+
+
+def test_unrelated_drafts_are_not_forced_to_lookup():
+    assert draft_contact_evidence_error('draft_email', {'to': 'sam@example.com'}) is None