ci: mypy ratchet -- keep type-clean modules clean (71 modules, 536 -> 442 errors) (#661)

* ci: mypy ratchet -- keep type-clean modules clean

mypy-clean.txt lists the 71 modules under src/ that type-check clean;
scripts/check_types.py runs mypy (--follow-imports=silent) on exactly
those files and fails on any error or a missing/unsorted/duplicate entry.
A new "Type check (mypy ratchet)" CI job runs it with mypy 1.20.2 and
pinned stubs; the manual pre-commit mypy hook now runs the same script
(a local hook, so mypy sees the installed requirements like CI does).

35 modules were made clean with annotation-only fixes: hints, typing.cast,
TYPE_CHECKING imports, implicit-Optional defaults made explicit, and
annotations widened (never guards removed) where mypy called a defensive
isinstance check unreachable. No runtime behaviour change.

mypy.ini: numpy and orjson are treated as Any (follow_imports=skip, also
for stubs). numpy 2.3+ stubs use 3.12 `type` statements that mypy won't
parse at python_version 3.10, and orjson is optional, so seeing its stubs
made the result depend on whether it was installed.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* chore: annotate check_types.py's list-form mypy subprocess

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

src/dynamic_team_resolver.py

@@ -20,7 +20,7 @@ Usage:
 import logging
 import time
 import requests
-from typing import Dict, List
+from typing import Any, Dict, List
 
 from src.common.api_helper import DEFAULT_HTTP_HEADERS
 
@@ -35,7 +35,7 @@ class DynamicTeamResolver:
     """
     
     # Cache for rankings data
-    _rankings_cache: Dict[str, List[str]] = {}
+    _rankings_cache: Dict[str, int] = {}  # team abbreviation -> AP rank
     _cache_timestamp: float = 0
     _cache_duration: int = 3600  # 1 hour cache
     # A failed or empty fetch is remembered briefly too: during an ESPN
@@ -45,7 +45,7 @@ class DynamicTeamResolver:
     _failure_backoff: int = 300  # 5 minutes
     
     # Supported dynamic team patterns
-    DYNAMIC_PATTERNS = {
+    DYNAMIC_PATTERNS: Dict[str, Dict[str, Any]] = {
         'AP_TOP_25': {'sport': 'ncaa_fb', 'limit': 25},
         'AP_TOP_10': {'sport': 'ncaa_fb', 'limit': 10}, 
         'AP_TOP_5': {'sport': 'ncaa_fb', 'limit': 5},