Fix hardcoded absolute paths in simulation scripts#1

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Shrishagk wants to merge 3 commits intomwt5345:mainfrom

Shrishagk:fix-hardcoded-paths

Commits on Jan 19, 2026

Fix: Replace absolute paths with os.path.join for portability
Shrishagk
committed

Commits on Jan 20, 2026

Fix CDM import error and apply model1 changes to Models I–III
Shrishagk
committed

Commits on Jan 21, 2026

Fix: implement version-agnostic pyHalo imports in lens.py
Shrishagk
committed