Add knowledge base suggestion architecture contract

[nonggde]

Closes #609

Summary

• repair the Knowledge Base Suggestion README/specs placeholders for the V2 team tool
• add a folder-local architecture contract covering components, services, hooks, tests, and docs
• document data ownership, dependency rules, prohibited production ownership, and future adapter constraints
• add a zero-dependency Node documentation contract test for the architecture boundary

Scope

• only touches tools/v2/team/knowledge-base-suggestion/
• no app shell, dashboard, routing, auth, wallet, Stellar, database, inbox, mail rendering, knowledge base publishing, notification, ticketing, or design-system integration
• no production data, live network calls, persistence, secrets, or side effects

Validation

• node --test tools/v2/team/knowledge-base-suggestion/tests/architecture-contract.test.mjs
• npx --yes prettier --check on the changed Knowledge Base Suggestion files
• git diff --check
• ASCII scan over tools/v2/team/knowledge-base-suggestion