docs: inherit end-of-session checks from base/scope.md

[braboj]

Summary

• Remove redundant "solid-ai-templates" submodule check (now in base/scope.md item 8)
• Add explicit reference to inherited checks (submodules, template feedback, flag gaps)

Depends on: braboj/solid-ai-templates#60

Test plan

• Verify end-of-session checklist is complete when combining local items + inherited items

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