Add customer support macro architecture contract

[nonggde]

Closes #429

Summary

• add a folder-local architecture contract for Customer Support Macro Tool
• document macro service, storage adapter, hook, fixture, test, and future component boundaries
• add data ownership notes and a zero-dependency Node architecture contract test for required docs, import isolation, and forbidden app/provider imports

Scope

• only touches tools/v1/team/customer-support-macro-tool/
• no app shell, dashboard, routing, inbox, compose, auth, wallet, Stellar, database, notification, provider, or design-system integration
• no production data, live network calls, server persistence, secrets, webhooks, or background jobs

Validation

• node --test tools/v1/team/customer-support-macro-tool/tests/architecture-contract.test.mjs
• npx --yes prettier --check on changed Customer Support Macro Tool files
• git diff --check
• ASCII scan over the changed Customer Support Macro Tool files

Notes

• Existing Vitest suites were attempted, but the current checkout lacks local Vitest/Vite plugin dependencies needed to load the tool/root Vitest config. This PR does not change runtime services, hooks, fixtures, or existing Vitest tests.