10 concrete patterns (Directional Collapse, Constant Class, Corpus Uniformity
Trap, Capacity Plateau, Schema Drift Contamination, Upstream Feature Starvation,
Axis Factorization, Grokking Phase Transition, Guardrail Rescue, Label Boundary
Drift), each with observable signal, mechanism, detection test, fix, failure
conditions, and a real whetstone_DSL example where one exists.
Motivated by the automatability gate session (April 2026) where Directional
Collapse was the root cause — deterministic always confused with template 100%
directionally, resolved by 2-stage decomposition to 100% accuracy.
Intended for use by developers and model-assisted debuggers without deep ML
background. Scale is not a pattern; these patterns exist to refute it.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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