Compliance suite: snapshot lifecycle equivalence (Inline / Async / Live)

[jeremydmiller]

Part of #5118 (compliance wave growth), epic #5110.

The compliance library asserts async snapshots (AsyncDaemonCompliance) and self-aggregating evolve (SelfAggregatingEvolveCompliance), but nothing yet pins the equivalence of the three lifecycles: the same aggregate registered Inline, Async or Live must produce the same document state, and only the persistence timing should differ.

ComplianceStoreConfig.Snapshot<TDoc>(SnapshotLifecycle) and the fixture's LoadDocumentAsync are already in place, so this is portable with no seam addition.

What each store tests today

Marten	Polecat
Projections/inline_aggregation_by_stream_with_multiples.cs	Projections/inline_projection_tests.cs
Projections/inline_aggregation_with_base_view_class.cs	Projections/snapshot_registration_tests.cs
Projections/inline_aggregation_with_non_public_setter.cs	Events/inline_projection_side_effects_tests.cs
Projections/inline_aggregation_with_private_constructor.cs
Projections/inline_aggregation_with_subclass.cs
Aggregation/when_doing_inline_per_stream_aggregations_with_Guid_stream_identity.cs
Aggregation/setting_version_number_on_aggregate.cs

Marten's inline-aggregation set is unusually broad (base classes, subclasses, non-public setters, private constructors) and Polecat's is thin — a classic drift asymmetry worth closing in the strongest direction.

Scope

New SnapshotLifecycleCompliance suite:

1. Same aggregate, same events, registered Inline vs Async vs Live → identical resulting state (the load-back for Live goes through AggregateStreamAsync)
2. Inline snapshot is persisted at SaveChangesAsync, asserted through LoadDocumentAsync, not a re-fold (this is precisely the drift Epic: cross-store event sourcing compliance test library (test harness standardization Phase 3) #5110 found in Polecat's originals)
3. Aggregate shapes: private constructor, non-public setter, base-class view, subclass
4. Version number stamped onto the aggregate (setting_version_number_on_aggregate)
5. Inline projection side effects ordering relative to the document write
6. A second append updates rather than duplicates the snapshot

Acceptance

• Suite enrolled in both stores, zero capability gates
• Marten's richer aggregate-shape cases survive the merge; Polecat gains them
• Originals retired in both repos