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_ajax_default_tools.py

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+import pytest
+
+from src.clean_agent_preview import compact_schemas, provider_compatible_tool_choice_request
+from src.tool_schemas import FUNCTION_TOOL_SCHEMAS
+
+
+@pytest.mark.parametrize('model', ['Ajax', 'local/Ajax', 'ajax-test'])
+@pytest.mark.parametrize('choice', ['required', {'type': 'function', 'function': {'name': 'manage_tasks'}}])
+def test_ajax_auto_decoding_preserves_selected_tool_boundary(model, choice):
+    from copy import deepcopy
+    tools = [s for s in FUNCTION_TOOL_SCHEMAS if s['function']['name'] in {'manage_tasks', 'manage_notes'}]
+    request = {'tools': tools, 'tool_choice': choice}
+    original = deepcopy(request)
+    compatible = provider_compatible_tool_choice_request(request, model)
+    assert compatible['tool_choice'] == 'auto'
+    names = {s['function']['name'] for s in compatible['tools']}
+    assert names == ({'manage_tasks'} if isinstance(choice, dict) else {'manage_tasks', 'manage_notes'})
+    assert request == original
+
+
+def test_ajax_explicit_no_tools_is_preserved():
+    request = {'tool_choice': 'none', 'tools': []}
+    assert provider_compatible_tool_choice_request(request, 'Ajax') is request
+
+
+@pytest.mark.parametrize('model', ['Ajax', 'ajax_c375', 'local/Ajax', 'ajax-test'])
+def test_ajax_does_not_offer_ask_user(model):
+    tools = [s for s in FUNCTION_TOOL_SCHEMAS
+             if s['function']['name'] in {'ask_user', 'web_fetch'}]
+    names = {s['function']['name'] for s in compact_schemas(tools, model=model)}
+    assert names == {'web_fetch'}
+    assert any(s['function']['name'] == 'ask_user' for s in tools)
+
+
+@pytest.mark.parametrize('model', [None, 'kimi-k3', 'odysseus-qwen3.5', 'not-ajax'])
+def test_other_models_keep_ask_user(model):
+    tools = [s for s in FUNCTION_TOOL_SCHEMAS if s['function']['name'] == 'ask_user']
+    assert [s['function']['name'] for s in compact_schemas(tools, model=model)] == ['ask_user']