Marten 9.5.2; register MasterTenantSource in DI (#3016); empty master-table seed fix (#3019); foundational per-tenant-partitioned-events tests (#3018)

[jeremydmiller]

Closes #3016. Closes #3019. Starts #3018 (foundational slice; deferred matrix tracked on the issue). Bumps to 6.4.2.

Marten 9.5.2

Bumps the Marten family 9.4.0 → 9.5.2. Its floors (JasperFx 2.8.0, Weasel 9.0.2) are already on main, so this is a Marten-only bump. Validated by a full wolverine.slnx Release build + the Marten test runs below.

#3016 — register MasterTenantSource as IDynamicTenantSource<string>

When UseMasterTableTenancy() is configured, the MasterTenantSource is now resolvable from DI as IDynamicTenantSource<string>, so store-agnostic admin consumers (e.g. CritterWatch's tenant-management handlers) can drive Add/Disable/Enable/Remove through the abstraction without sniffing the concrete type.

Registration point matters. The issue suggested registering inside BuildMessageStore, but that runs lazily off the AddSingleton<IMessageStore>(s => ...) factory — after the container is built — so it would never reach host.Services. And Configure() runs eagerly via Include(), before the fluent .UseMasterTableTenancy() sets the flag. So the registration goes in the fluent UseMasterTableTenancy() method itself (config time, pre-build); the factory defers to IMessageStore resolution, which constructs the MasterTenantSource and assigns ConnectionStringTenancy.

Tests (positive resolves MasterTenantSource; negative — no UseMasterTableTenancy → empty). Both verified fail-without/pass-with.

#3019 — empty master-table seed crash

SeedDatabasesAsync threw "CommandText property has not been initialized" when the master tenant table starts empty (no seeded tenants): the empty assignment set appended no SQL, so the compiled command had no CommandText. Now it skips execution when there is nothing to seed (an empty master table is valid — tenants can be registered at runtime). Regression test boots a host with UseMasterTableTenancy(_ => {}) and StartAsync — verified fail-without/pass-with.

#3018 — foundational per-tenant-partitioned-events test slice

First Wolverine tests exercising the aggregate-handler workflow against Events.UseTenantPartitionedEvents (Conjoined + Quick), on string and guid stream identity:

• tenant-routed append lands in the correct tenant partition (and is invisible to other tenants);
• the same stream-id value in two tenants stays isolated;
• a no-tenant command falls to the default-tenant partition, isolated from named tenants.

Findings (these correct the issue's premises — see the issue checklist comment)

• Managed partitions, not lazy 42P01. Marten 9.5.2 requires store.Advanced.AddMartenManagedTenantsAsync(...) before a tenant's first append, else MT002 — there is no lazy 42P01 provisioning. The "fresh tenant 42P01" item is therefore reframed.
• The projected aggregate must be MultiTenanted() to match conjoined events ("Tenancy storage style mismatch" otherwise).
• The default tenant also needs an explicit partition, registered with a table-safe suffix (*DEFAULT* is not a legal suffix).
• Observation for follow-up: an append for a never-registered tenant via Wolverine's invoke path did not surface MT002 — left out of this slice pending investigation.

The full 2a/2b matrix (multi-node distribution, sharded DBs, HTTP endpoints, exclusive concurrency, blue/green, subscriptions/RelayWithEventTenant) remains deferred — checklist on #3018.

Validation

• Full wolverine.slnx Release build clean (net9.0 + net10.0), 0 warnings / 0 errors.
• PostgresqlTests (Register MasterTenantSource as IDynamicTenantSource<string> in DI when UseMasterTableTenancy is configured #3016 + MasterTableTenancy: SeedDatabasesAsync throws "CommandText property has not been initialized" when the master tenant table starts empty #3019): green (1 unrelated RabbitMQ replay flake in the broader run).
• MartenTests/AggregateHandlerWorkflow (71 incl. the new 5): green — confirms Marten 9.5.2 runtime + no discovery collisions from the new aggregate/handler types.

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