[WIP] Update PHASE2_TODO.md with pending tasks from BLUEPRINT.md#18

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Commits on Nov 23, 2025

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Update PHASE2_TODO.md to align with BLUEPRINT.md Phase 2 scope

Copilot
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kiarashplusplus
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Update PHASE2_TODO.md: Mark session management & cache optimization as DONE

Copilot
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kiarashplusplus
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