fix: remove redundant NewGenericSyntax from mypy.ini

[fuleinist]

Fixes the Warning: NewGenericSyntax is already enabled by default warning emitted on every make typecheck run.

Root cause: python_version = 3.13 was raised in PR #727 but the enable_incomplete_feature = NewGenericSyntax line was left behind. Since mypy 1.12+, this feature is enabled by default for Python 3.12+, making the flag redundant.

Fix: remove the redundant line from mypy.ini. Type-checking still passes on all 385 source files.

Closes #797

[greptile-apps]

Greptile Summary

Removes the enable_incomplete_feature = NewGenericSyntax line from mypy.ini that became redundant after python_version was bumped to 3.13 in PR #727. Since mypy 1.12+, NewGenericSyntax is on by default for Python 3.12+, so the retained flag caused a spurious warning on every make typecheck run.

Confidence Score: 5/5

Safe to merge — removes a single redundant config line with no functional impact.

The change is a one-line deletion of a flag that mypy itself reports as redundant for the configured Python version. No logic, runtime code, or type-checking behaviour is affected.

No files require special attention.

Important Files Changed

Filename	Overview
mypy.ini	Removes the now-redundant enable_incomplete_feature = NewGenericSyntax line; with python_version = 3.13 and mypy 1.12+, this feature is enabled by default so the flag only produced a warning.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A["make typecheck"] --> B["mypy invoked\n(python_version = 3.13)"]
    B --> C{"mypy >= 1.12?"}
    C -- "yes" --> D["NewGenericSyntax\nenabled by default"]
    D --> E_old["⚠️ Warning: already enabled\n(before this PR)"]
    D --> E_new["✅ No warning\n(after this PR)"]
    C -- "no" --> F["feature flag needed\n(not applicable here)"]

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