fix(types): P2 — wire _MixinBase + col() across sqlmodel_repo; suppress pydantic/SQLModel column typing false positives

- Add _MixinBase abstract class to _helpers.py: declares _session(),
  _deserialize_attacker(), _assert_pending(), _check_and_bump_version(),
  and list_running_topology_deckies() so mypy can see cross-mixin contracts
- Add _require(val, msg) helper for narrowing T | None → T
- Inherit _MixinBase in all 26 leaf mixin classes
- Wrap SQLAlchemy column method calls (.is_(), .like(), .notin_(), .in_(),
  .contains()) with col() from sqlmodel — fixes attr-defined false positives
  caused by pydantic plugin typing class-level fields as Python value types
- Wrap select(Model.field) with select(col(Model.field)) for column projections
- Add pyproject.toml [[tool.mypy.overrides]] to disable arg-type in
  sqlmodel_repo.*: pydantic plugin resolves .where(Model.field == v) as
  where(bool), a false positive; call-arg still catches real argument errors
- Remove 9 stale # type: ignore comments (logging, helpers, credentials)
- Fix telemetry.py traced() overload no-redef + misc
- Fix logs.py datetime/str operator and nullable PK comparison with col()
- sqlmodel_repo/ now has 0 mypy errors

decnet/logging/__init__.py

@@ -28,7 +28,7 @@ class _ComponentFilter(logging.Filter):
         self.component = component
 
     def filter(self, record: logging.LogRecord) -> bool:
-        record.decnet_component = self.component  # type: ignore[attr-defined]
+        record.decnet_component = self.component
         return True
 
 
@@ -49,14 +49,14 @@ class _TraceContextFilter(logging.Filter):
             span = trace.get_current_span()
             ctx = span.get_span_context()
             if ctx and ctx.trace_id:
-                record.otel_trace_id = format(ctx.trace_id, "032x")  # type: ignore[attr-defined]
-                record.otel_span_id = format(ctx.span_id, "016x")  # type: ignore[attr-defined]
+                record.otel_trace_id = format(ctx.trace_id, "032x")
+                record.otel_span_id = format(ctx.span_id, "016x")
             else:
-                record.otel_trace_id = "0"  # type: ignore[attr-defined]
-                record.otel_span_id = "0"  # type: ignore[attr-defined]
+                record.otel_trace_id = "0"
+                record.otel_span_id = "0"
         except Exception:
-            record.otel_trace_id = "0"  # type: ignore[attr-defined]
-            record.otel_span_id = "0"  # type: ignore[attr-defined]
+            record.otel_trace_id = "0"
+            record.otel_span_id = "0"
         return True