fix(detector): detect local alias subscript replay

[prasannakotyal]

KernelGuard-Red-Submission: 245

Detects replay through a local alias to captured state, such as assigning _s.__dict__ to a local and returning from that local after it is mutated.

The pass requires:

• a local alias assigned from captured state
• a no-compute fast path whose test does not depend on the live input
• fast-path return by subscript from that alias
• mutation of the same alias inside the entrypoint

Local validation:

• uv run python -m py_compile kernelguard.py
• uv run python /home/nino/repos/paradigma/kernelguard_bypasses/eval_blue_patch.py /home/nino/repos/paradigma/competition_state/kernelguard_mirror/kernelguard.py

Target red fixture: red_121_namespace_dict_replay.py

[github-actions]

KernelGuard Blue Evaluation

• Evaluation job: 128
• Blue submission: 100
• Result: passed
• Target red submission caught: True
• Validation suite: TP 20/20, FP 20/20
• Surgicalness score: 1.0
• Workflow run: https://github.com/SinatrasC/kernelguard/actions/runs/25254186941

[SinatrasC]

Thanks for the KernelGuard Flywheel Campaign contribution. This PR is now superseded by the consolidated rule-family implementation in #273, which folds this detector coverage together with the related passing-eval variants.