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_compact_email_editor.py

@@ -0,0 +1,15 @@
+from src.clean_agent_preview import email_draft_document_id, evaluate_preview_call
+
+
+def test_compact_runtime_allows_contact_resolution():
+    decision = evaluate_preview_call('resolve_contact', {'name': 'Jon'}, 'Write an email to Jon')
+    assert decision.allowed, decision.reason
+
+
+def test_successful_email_receipt_opens_its_document():
+    doc_id = '0ca3b68b-667c-487b-b3ec-676afe932c28'
+    result = {'stdout': f'Created Odysseus email draft (document ID: {doc_id}).'}
+    assert email_draft_document_id('mcp__email__draft_email', result) == doc_id
+    assert email_draft_document_id('draft_email', result, failed=True) is None
+    assert email_draft_document_id('read_email', result) is None
+    assert email_draft_document_id('draft_email', {'stdout': 'Error: failed'}) is None