Improve Optional Dependency Error Handling & Regression Tests#9

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greenarmor wants to merge 3 commits intoperone:mainfrom

greenarmor:main

Commits on Nov 26, 2025

Made PerceptionEncoder imports lazy with clear ImportErrors for missing torch, vision encoder
greenarmor
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Added regression tests that monkeypatch missing optional dependencies to ensure PerceptionEncoder raises descriptive ImportErrors when the vision stack is absent.
greenarmor
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Strengthened the optional dependency error test to assert that missing components for the perception encoder are explicitly listed in the guidance message.
greenarmor
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