docs: present Memory Bank as a self-growing development system

[dapi]

Summary

• present Memory Bank as a knowledge base, governance layer, and delivery system
• explain the feedback loop from project knowledge through Feature Pack and verified implementation back to durable knowledge
• name FPF as the methodological foundation and document the repository's Symphony integration
• rewrite the Russian overview with Russian terminology wherever a specific technical name is not required

Verification

• git diff --check
• README relative-link audit
• ruby tools/validate-priming-manifests.rb template/memory-bank
• memory-bank-cli lint --scope-root template/memory-bank --entrypoint template/memory-bank/README.md
• memory-bank-cli doctor --profile template