Interactive product demo

ledger-api: README fix with misleading "clean checkout" verification claim

Low severity across 17 messages. ledger-api: README fix with misleading "clean checkout" verification claim.

These sessions use fictional sample data.

ledger-api: Agent runs unrequested Alembic migration outside task scope

ledger-api: README/onboarding doc fixes verified locally, no issues

Ledger-API: Update outdated setup steps in README and onboarding docs

Ledger-API: Agent fixes out-of-date setup instructions in README and onboarding documentation.