Add MariaDB IPL validation, topology docs in beds.toml, and developer wiki

- Add MariaDB (REL) IPL validation — master required, secondary non-fatal
- Add RelNodeConfig / RelInstanceConfig structs with master/secondary pattern
- Add rel_services section to beds.toml and test fixture
- Add detailed topology commentary to beds.toml covering standalone,
  master/replica, Galera cluster, and multi-DB-per-node configurations
- Add developer wiki (wiki/) covering:
    - Origin story — PHP Namaste history, production record, why Rust
    - Architecture overview — full system diagram, all layers explained
    - The four nodes — appServer, admin, segundo, tercero with real-world context
    - IPL sequence — every step documented with rationale for ordering
    - Configuration system — layering, env selection, adding new sections
    - Queue topology — exchanges, routing keys, broker bindings, vhost isolation
    - Template system — REC/REL, TLA convention, cache map, warehousing
    - Event lineage — compound event IDs, parent/child tracking, msLogs schema
    - Glossary
- Update README with wiki index and MariaDB status

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

claude.md

@@ -32,6 +32,7 @@ rustybeds/
 │   │   ├── mod.rs            # load() + load_from() — layered TOML config
 │   │   └── structs.rs        # Typed config structs (serde Deserialize)
 │   ├── amqp.rs               # RabbitMQ transport — validate(), future channel/queue ops
+│   ├── mariadb.rs            # MariaDB transport — validate_all(), master/secondary pattern
 │   ├── mongo.rs              # MongoDB transport — validate_all(), future adapter ops
 │   ├── lib.rs                # Public API surface for integration test harness
 │   ├── logging.rs            # tracing + journald + console mirror init