backbone-mailing 0.6.0

Email marketing — mass-mail engine: audiences, subscriptions, hand-set mailing lifecycle, seeded A/B testing, per-recipient traces, cycle-44 bridge targets (Odoo mass_mailing port)
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# Architecture Decision Records

One decision per record: context, decision, alternatives, consequences. **Immutable once
accepted** — to change a decision, write a new ADR that supersedes the old one and update its
Status line; never edit an accepted decision in place.

| ADR | Decision | Status |
|-----|----------|--------|
| [0001](adr-0001-schema-yaml-ssot.md) | Schema YAML is the single source of truth | Accepted |
| [0002](adr-0002-generic-crud.md) | CRUD is inherited from generics, not written per entity | Accepted |
| [0003](adr-0003-custom-markers.md) | Regen-safety via CUSTOM markers and `user_owned` | Accepted |