Router misses ARCHITECTURE classification for 'redesign' tasks

[NeelPrime]

Summary

The task classifier fails to classify certain architecture-level tasks correctly. Tasks containing "redesign" are classified as UNKNOWN/MEDIUM instead of ARCHITECTURE/EXPERT.

Reproduction

from arbiterx.router.classifier import TaskClassifier
classifier = TaskClassifier()

result = classifier.classify("redesign the entire authentication system to support OAuth2, SAML, and OpenID Connect")
print(result.task_type.name)    # UNKNOWN — should be ARCHITECTURE
print(result.complexity.name)   # MEDIUM — should be EXPERT

Expected Behavior

Tasks containing keywords like "redesign", "rearchitect", "overhaul", "migrate architecture" should be classified as ARCHITECTURE type with HIGH or EXPERT complexity.

Tasks that DO work correctly

"architect a new microservice for payment processing"  → ARCHITECTURE/EXPERT ✓
"design a caching layer with Redis and fallback"       → ARCHITECTURE/HIGH ✓

Suggested Fix

Add "redesign", "rearchitect", "overhaul", "restructure" to the architecture keyword patterns in the classifier.