docs: fix code/API contradictions, stale references, and broken links

[jeremydmiller]

Full documentation review across all 220 guide/, tutorials/, and introduction/ pages, looking for inconsistencies and anything contradicted by the current code (6.8.0). The 750 snippet-embedded code references were verified in sync (0 broken), so every fix here targets prose, inline (non-snippet) code, links, and stale content.

🔴 Code/API contradictions (would not compile / wrong API)

• nats.md — UseJetStream() requires a config arg on the transport expression; TenantedIdBehavior.RequireTenantId → TenantIdRequired; ITenantSubjectMapper.MapSubjectForTenant → MapSubject
• grpc/handlers.md — IdempotencyStyle.GetOrPost (doesn't exist) → Eager
• runtime/heartbeats.md — RunOasisAsync() (doesn't exist) → RunJasperFxCommands(args)
• sqs/fifo-queues.md — dlq.Attributes[...] → dlq.Configuration.Attributes[...]
• from-mediatr.md — handler example referenced undefined _writer/request
• runtime/encryption.md — Encrypt<T>() → Encrypt()

🔴 Wrong package / wrong described behavior

• http/validation.md — removed reference to nonexistent WolverineFx.Http.DataAnnotationsValidation package (the middleware ships in core Wolverine.Http)
• marten/index.md — Wolverine.Persistence.Marten → WolverineFx.Marten
• oracle.md — advisory locks use row-level FOR UPDATE NOWAIT, not DBMS_LOCK/schema-hash
• marten/event-sourcing.md — "Validation on Stream Existence" said the aggregate is not required by default; current default is required (WriteAggregateAttribute.Required = true, Simple404) — which also matches the page's own info box

🟡 Stale references

• cqrs-with-marten/polecat.md — RunOaktonCommands → RunJasperFxCommands
• durability/index.md — InboxStaleTime/OutboxStaleTime "will be defaults in 6.0" → still opt-in at 6.8
• durability/managing.md — added db-list to the help output; Oakton → JasperFx

🟡 Internal inconsistencies / copy-paste leftovers

• azureservicebus/multi-tenancy.md — RabbitMQ "virtual hosts"/"outgoing" leftovers
• sqlserver.md — "saga support for PostgreSQL" → Sql Server
• dataannotations-validation.md — "Fluent Validation middleware" → Data Annotations
• efcore/operations.md — link pointed at marten/transactional-middleware → efcore/
• diagnostics.md — the "at startup" env check is run --check, not a duplicate check-env
• tutorials/index.md — ping-pong tutorial is TCP, not Rabbit MQ
• durability/sagas.md — added the omitted SagaId step to the id-resolution list
• http/integration.md — added [WolverinePatch] to the verb list

🟡 Broken links

• basics.md azure-service-bus → azureservicebus
• rabbitmq/interoperability.md ./transports/rabbitmq.md → ./index.md
• partitioning.md #sharded-publishing → #partitioned-publishing-to-external-transports
• vertical-slice-architecture.md /tutorials/from-mediatr → /introduction/from-mediatr
• durability/index.md dead DurabilityAgent.cs GitHub link → Wolverine.RDBMS path
• serverless.md empty pre-generated-types link → codegen anchor

⚪ Typos

IMesageContext → IMessageContext (x3); Starts/StartAsync → Starts/StartsAsync; stray ~~~~ artifacts; dotnet add → dotnet add package for Kafka/MQTT/Redis/Pulsar.

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Deliberately left out (need a human decision, not a mechanical fix)

• introduction/support-policy.md — version table lists Wolverine 4 as "Current" (repo is 6.8.0). Needs real EoL/release dates for the 6.x/5.x lines, which aren't in the code.
• Empty/stub pages & TODO placeholders — messaging/policies.md, sqs/queues.md, tutorials/dead-letter-queues.md (title-only); empty section headers in messaging/introduction.md; the truncated "Spy" section in efcore/domain-events.md; TODO/snippet-todo placeholders in message-bus.md, handlers/multi-tenancy.md, handlers/error-handling.md, and azureservicebus/deadletterqueues.md. These need real content.
• Borderline staleness left as-is: the messages.md .NET 8 NotSupportedException caveat, the ".NET 6/7 Program file" framing in managing.md, and the "Wolverine 4.0 will embrace IHealthCheck" aside in diagnostics.md.

🤖 Generated with Claude Code

[jeremydmiller]

Update: the support-policy.md table is now fixed in this PR too (it was originally listed under "left for a human decision"). It now shows 6 = Current (no EOL), 5 = P1 fixes, 4 and earlier = EoL. The v5 End-of-Life date is left as TBD — it needs the real value once the 6.0 GA date + 6-month window is confirmed.

Follow-up issues filed for the empty/stub/TODO pages: #3090, #3091, #3092, #3093, #3094, #3095, #3096, #3097, #3098.