Document Python import style guidelines in AGENTS.md

AGENTS.md

@@ -45,6 +45,7 @@ AGENTS.md. In all cases show what you added to AGENTS.md.
 - Avoid potential import cycles between conversation orchestration and pipeline modules by using neutral payload protocols/arguments instead of importing concrete pipeline result classes across modules.
 - Prefer ordinal type aliases (e.g., `MessageOrdinal`, `ChunkOrdinal`) over raw `int` in pipeline code for readability.
 - When the user asks to "fix the test only", update tests/mocks first and avoid adding production compatibility fallbacks unless explicitly requested.
+- For date/time range handling, use the half-open interval convention `[start, stop)` (stop is exclusive), as agreed in PR #198 — this avoids the ambiguity of an inclusive end (e.g. does "end of day" mean 00:00:00 or 23:59:59.999999?). Prefer this over inclusive-end ranges even when padding the end to end-of-day would also work.
 
 ## Package Management with uv
 
@@ -110,6 +111,15 @@ please follow these guidelines:
   - **Exception**: Explicit re-export patterns like `from ... import X as X` or marked with "# For export"
   - This prevents circular imports and makes dependencies clear
 
+## Python Import Style Guidelines
+
+* **Default to Module-Qualified Imports:** Prefer importing whole modules and using qualified calls (e.g., `import math; math.sqrt(16)` or `import pandas as pd; pd.DataFrame()`) to prevent namespace pollution, avoid name clashes, and provide immediate context for where functions or objects originate.
+* **Use Direct Symbol Imports Cautiously:** Restrict direct imports (`from module import symbol`) to specific scenarios where they genuinely improve readability or adhere to standard conventions:
+  * Importing classes, exceptions, or constants (e.g., `from my_project.models import User`).
+  * Avoiding severe, repetitive visual clutter in heavy mathematical or algorithmic code.
+  * Standard library patterns (e.g., `from collections import defaultdict, Counter`).
+* **Prohibit Wildcard Imports:** Never use wildcard imports (`from module import *`) under any circumstances.
+
 * Order imports alphabetically after lowercasing; group them as follows
   (with a blank line between groups):
   1. standard library imports

pyproject.toml

@@ -1,5 +1,5 @@
 [build-system]
-requires = ["uv_build>=0.9.10,<0.11.0"]
+requires = ["uv_build>=0.9.10,<0.12.0"]
 build-backend = "uv_build"
 
 [project]
@@ -96,7 +96,7 @@ dev = [
   "logfire>=4.32.1",  # So 'make check' passes
   "msgraph-sdk>=1.56.0",
   "opentelemetry-instrumentation-httpx>=0.61b0",
-  "pyright>=1.1.409",
+  "pyright>=1.1.411",
   "pytest>=9.0.3",
   "pytest-asyncio>=1.3.0",
   "pytest-mock>=3.15.1",

src/typeagent/knowpro/answers.py

@@ -2,9 +2,9 @@
 # Licensed under the MIT License.
 
 import asyncio
-import os
 from collections.abc import Iterable
 from dataclasses import dataclass, field
+import os
 from typing import Any
 
 import typechat