diff --git a/adapters/linear/doc.go b/adapters/linear/doc.go
index 9a795c9..e48eaff 100644
--- a/adapters/linear/doc.go
+++ b/adapters/linear/doc.go
@@ -1,7 +1,8 @@
 // Package linear provides a Linear app-actor adapter for Chat SDK Go.
 //
 // The adapter participates as a Linear app-owned actor on App-Actor Client
-// Credentials (a Single-Install Adapter). It supports two Linear interaction
+// Credentials (a Single-Install Adapter by default; see Multi-tenant installs
+// below for serving many organizations). It supports two Linear interaction
 // models, both reached through the small chat.Adapter interface and the opaque,
 // versioned Thread ID:
 //
diff --git a/adapters/slack/doc.go b/adapters/slack/doc.go
index b37547b..f1554ba 100644
--- a/adapters/slack/doc.go
+++ b/adapters/slack/doc.go
@@ -24,9 +24,12 @@
 //
 // The install credential rides as the adapter-specific slack.SlackInstall payload
 // on chat.Install.Credential (a Platform Escape Hatch for credentials): the
-// per-workspace bot token plus an optional bot user id used for tenant-correct
-// self-filtering. Thread Handle reconstruction (out-of-webhook posting) resolves
-// the same way, keyed by the Platform Tenant decoded from the opaque Thread ID.
+// per-workspace bot token plus the bot user id used for tenant-correct
+// self-filtering. The bot user id is optional in the type but should be treated
+// as required: without it the bot's own posts are not filtered, and a
+// subscribed thread can loop on its own replies. Thread Handle reconstruction
+// (out-of-webhook posting) resolves the same way, keyed by the Platform Tenant
+// decoded from the opaque Thread ID.
 //
 // # Message history (ADR 0009)
 //
@@ -41,15 +44,17 @@
 //
 // # Rate-limit retry (ADR 0005)
 //
-// Outbound posts are hardened against Slack throttling by default. The adapter
-// wraps its Slack Web API call site (chat.postMessage / chat.postEphemeral /
-// conversations.open) with bounded retry on a Slack 429 (honoring the Retry-After
-// header, in seconds) and the ratelimited API error. Retry is bounded three ways:
-// an attempt cap (Options.RetryPolicy.MaxAttempts), a cumulative backoff ceiling
-// (MaxElapsed), and the caller's context deadline. The single load-bearing
-// invariant is that in-line synchronous retry never sleeps past the caller's
-// context deadline, so retry under the default DispatchSync stays inside Slack's
-// 3-second ack window and cannot trigger a platform redelivery storm.
+// Outbound calls are hardened against Slack throttling by default. The adapter
+// wraps every Slack Web API call (including auth.test, chat.postMessage,
+// chat.postEphemeral, conversations.open, views.open, and history reads) and
+// every response_url post with bounded retry on a Slack 429 (honoring the
+// Retry-After header, in seconds) and the ratelimited API error. Retry is
+// bounded three ways: an attempt cap (Options.RetryPolicy.MaxAttempts), a
+// cumulative backoff ceiling (MaxElapsed), and the caller's context deadline.
+// The single load-bearing invariant is that in-line synchronous retry never
+// sleeps past the caller's context deadline, so retry under the default
+// DispatchSync stays inside Slack's 3-second ack window and cannot trigger a
+// platform redelivery storm.
 //
 // The RetryPolicy is per-adapter platform config in Options, never Runtime
 // Options. Its zero value is a conservative default that keeps MaxElapsed under
diff --git a/docs/how-to/choose-a-state-backend.md b/docs/how-to/choose-a-state-backend.md
index 05c3fb6..e83fd3b 100644
--- a/docs/how-to/choose-a-state-backend.md
+++ b/docs/how-to/choose-a-state-backend.md
@@ -45,8 +45,12 @@ import (
 	chatredis "github.com/coder/chat/state/redis"
 )
 
+redisOptions, err := redis.ParseURL(os.Getenv("REDIS_URL")) // e.g. redis://127.0.0.1:6379/0
+if err != nil {
+	return err
+}
 redisState, err := chatredis.New(ctx, chatredis.Options{
-	Client: redis.NewClient(&redis.Options{Addr: os.Getenv("REDIS_ADDR")}),
+	Client: redis.NewClient(redisOptions),
 	Prefix: "mybot", // see "One namespace per bot application" below
 })
 ```
diff --git a/docs/how-to/deferred-dispatch.md b/docs/how-to/deferred-dispatch.md
index 75df8a1..b64d1a0 100644
--- a/docs/how-to/deferred-dispatch.md
+++ b/docs/how-to/deferred-dispatch.md
@@ -46,8 +46,9 @@ bot, err := chat.New(ctx,
 
 - `Dispatch: chat.DispatchDeferred` turns on ack-then-work. The default is
   `chat.DispatchSync`, which runs the handler before acknowledging.
-- `DetachTimeout` bounds how long a detached handler may run after the webhook
-  request has ended.
+- `DetachTimeout` (required under `DispatchDeferred`; `DefaultRuntimeOptions()`
+  leaves it at zero, so `chat.New` fails until you set it) bounds how long a
+  detached handler may run after the webhook request has ended.
 - `Concurrency: chat.ConcurrencyQueue` is the natural companion: while a
   detached handler holds the thread lock, follow-up events on the same thread
   wait instead of being dropped, and only the most recent superseded follow-up
diff --git a/docs/how-to/linear-agent-sessions.md b/docs/how-to/linear-agent-sessions.md
index f907435..881e312 100644
--- a/docs/how-to/linear-agent-sessions.md
+++ b/docs/how-to/linear-agent-sessions.md
@@ -97,7 +97,6 @@ if err := la.UpdateSession(ctx, ev.Thread.ID(), linear.AgentSessionUpdateInput{
 		{Title: "Reproduce the bug", Status: "pending"},
 		{Title: "Fix and test", Status: "pending"},
 	},
-	ReplacePlan: true,
 }); err != nil {
 	return err
 }
@@ -148,9 +147,10 @@ This check only runs when the stop event reaches your handler, and events on
 one thread are serialized by the thread lock — a stop arriving while a
 handler is still running cannot preempt it (`ConcurrencyDrop` discards it on
 conflict; `ConcurrencyQueue` delivers it only after the in-flight handler
-returns). The ADR 0012 force/steerability hook that would allow preemption is
-staged behind the deferred-dispatch coordination design work, so **Linear's
-Stop control cannot cancel in-flight work through this adapter today**. What
+returns). The runtime has no preemption: the ADR 0012 force/steerability hook
+that would allow it is rejected for v0.x by
+[ADR 0015](../adr/0015-runtime-coordination.md), so **Linear's Stop control
+cannot cancel in-flight work through this adapter**. What
 you can do: structure long
 sessions as short handler turns (each turn checks `StopRequested` on the
 event that started it before doing more work — `confirmStop` above is exactly
diff --git a/docs/linear-agent-capabilities.md b/docs/linear-agent-capabilities.md
index 93487eb..6e0d99b 100644
--- a/docs/linear-agent-capabilities.md
+++ b/docs/linear-agent-capabilities.md
@@ -33,7 +33,7 @@ hatch rather than typed helpers.
 | Typed activity helpers | Supported | `PostThought`, `PostAction`, `PostElicitation`, `PostError`; `Thread.Post` creates the `response` activity. |
 | Agent-to-human signals | Supported | `auth` and `select` signals with metadata pass through `CreateAgentActivity` / `PostElicitation`. |
 | Human-to-agent stop signal | Supported | `RawMessageFrom(ev.Message)` exposes `Signal` / `StopRequested()`; see the routing caveat below. |
-| Session updates | Supported | `UpdateSession` sets `externalUrls` and replaces the session plan array. |
+| Session updates | Supported | `UpdateSession` replaces `externalUrls` or adjusts them with `AddExternalURLs` / `RemoveExternalURLs`, and replaces the session plan array. |
 | GraphQL escape hatch | Supported | `GraphQL` (single-install) and `GraphQLForTenant` (multi-tenant) reuse adapter auth and token refresh, surface GraphQL errors, and never expose tokens. |
 | Proactive agent session creation | Supported | `CreateSessionOnIssue` / `CreateSessionOnComment` (plus `ForTenant` variants) wrap `agentSessionCreateOnIssue` / `agentSessionCreateOnComment`; the returned `CreatedAgentSession` carries the adapter's opaque `ThreadID` ([#47](https://github.com/coder/chat/issues/47)). |
 | Repository suggestions | Supported | `SuggestRepositories` wraps `issueRepositorySuggestions` with typed candidates and confidence-scored results ([#48](https://github.com/coder/chat/issues/48)). |
diff --git a/docs/reference.md b/docs/reference.md
index 653a366..0bd3e76 100644
--- a/docs/reference.md
+++ b/docs/reference.md
@@ -239,10 +239,11 @@ inbound webhook request context before the platform acknowledgement. For
 long-running work, opt in to `DispatchDeferred` (ack-then-work,
 [ADR 0002](adr/0002-async-dispatch.md)): the dedupe and lock prelude runs
 before the acknowledgement, then the handler runs on a detached work context
-with automatic lock lease renewal, bounded by `DetachTimeout`. Under deferred
-dispatch `MaxDetached` bounds admitted-but-incomplete deliveries; a delivery
-arriving at the bound is rejected with `chat.ErrAdmissionRejected` before
-acknowledgement and before dedupe marking ([ADR 0015](adr/0015-runtime-coordination.md)).
+with automatic lock lease renewal, bounded by `DetachTimeout` (which must be
+positive under deferred dispatch). Under deferred dispatch `MaxDetached`
+bounds admitted-but-incomplete deliveries; a delivery arriving at the bound is
+rejected with `chat.ErrAdmissionRejected` before acknowledgement and before
+dedupe marking ([ADR 0015](adr/0015-runtime-coordination.md)).
 The [deferred dispatch guide](how-to/deferred-dispatch.md) covers enabling
 it and writing handlers for the detached context.
 
@@ -325,7 +326,7 @@ The runtime implements all five upstream-aligned concurrency strategies
 - `ConcurrencyDebounce`: each new routed event supersedes the previous
   waiter; only the final event in a `DebounceInterval` quiet period
   dispatches, and superseded events are observable. Requires deferred
-  dispatch.
+  dispatch and a `DetachTimeout` longer than `DebounceInterval`.
 - `ConcurrencyConcurrent`: no thread lock at all; every event dispatches in
   its own execution, bounded by `MaxConcurrent`.
 - `ConcurrencyBurst`: routed events for a scope collect for a `BurstWindow`,
diff --git a/docs/tutorials/slack-bot.md b/docs/tutorials/slack-bot.md
index d98b949..2c5be84 100644
--- a/docs/tutorials/slack-bot.md
+++ b/docs/tutorials/slack-bot.md
@@ -97,7 +97,7 @@ discover the bot's own identity. If the token is wrong you find out now, not
 on the first message. When the bot is up you should see a log line like:
 
 ```text
-level=INFO msg=listening addr=:8080
+2026/09/23 14:00:00 INFO listening addr=:8080
 ```
 
 ## Step 5: Expose The Bot To Slack
@@ -165,7 +165,7 @@ this, only mentions ever reach it:
 2. In **Event Subscriptions**, add the `message.channels` bot event.
 3. Reinstall the app from **OAuth & Permissions**.
 
-(If you set up `message.im` in Step 2, you can skip this and test the
+(If you subscribed to `message.im` in Step 6, you can skip this and test the
 follow-up flow in a direct message instead.)
 
 Then open `examples/slack-hello-world/main.go` and replace the
diff --git a/examples/linear-agent-hello-world/README.md b/examples/linear-agent-hello-world/README.md
index 01afa20..9fb4111 100644
--- a/examples/linear-agent-hello-world/README.md
+++ b/examples/linear-agent-hello-world/README.md
@@ -151,20 +151,25 @@ Expected behavior:
    Thinking...
    ```
 
-5. The app posts the final response:
+5. The app posts a `search-codebase` action and adds a **Draft PR** external
+   link to the session.
+6. The app posts the final response, a bold `hello from Linear app actor`
+   line followed by a note inviting a follow-up prompt.
 
-   ```text
-   hello from Linear app actor
-   ```
+   If the prompt text is exactly `deploy`, the app instead asks a `select`
+   question ("Which environment should I target?", `staging` or `prod`), and
+   your next follow-up is read as the answer.
 
-6. Send a follow-up prompt in the same Linear agent session.
-7. The example routes it to `OnSubscribedMessage`, posts another ephemeral
-   thought, and replies with:
+7. Send a follow-up prompt in the same Linear agent session.
+8. The example routes it to `OnSubscribedMessage`, posts the ephemeral thought
+   `Reading your follow-up...`, and replies with:
 
    ```text
    Follow-up received: YOUR_MESSAGE
    ```
 
+   A follow-up carrying Linear's stop signal gets a stop confirmation instead.
+
 ## Dogfooding Evidence
 
 Before claiming a live Linear dogfood passed, capture screenshots or video of:
@@ -179,7 +184,8 @@ Before claiming a live Linear dogfood passed, capture screenshots or video of:
 
 - State is in memory, so subscriptions and dedupe data are lost when the process
   exits.
-- Use Redis or Postgres runtime state for production deployments.
+- Use Redis, Postgres, or NATS JetStream runtime state for production
+  deployments.
 - Linear request signatures are verified with `LINEAR_WEBHOOK_SECRET`.
 - Client credentials are exchanged during adapter startup and refreshed lazily
   before Linear API calls.
diff --git a/examples/slack-hello-world/README.md b/examples/slack-hello-world/README.md
index a91dfc1..bfcba09 100644
--- a/examples/slack-hello-world/README.md
+++ b/examples/slack-hello-world/README.md
@@ -5,8 +5,8 @@ mentioned in a channel, or messaged directly if you enable the DM event, it
 replies with portable Markdown: `**hello** _world_`.
 
 This example requires `CHAT_DEMO_IN_MEMORY_STATE=1` because state is lost on
-restart. Use `examples/slack-redis-state` or `examples/slack-postgres-state` for
-durable Slack apps.
+restart. Use `examples/slack-redis-state`, `examples/slack-postgres-state`, or
+`examples/slack-nats-state` for durable Slack apps.
 
 ## Slack App Setup
 
@@ -45,12 +45,9 @@ In **Event Subscriptions**:
    https://YOUR_PUBLIC_HOST/webhooks/slack
    ```
 
-3. Subscribe to these **Bot User Events**:
-
-   ```text
-   app_mention
-   message.im
-   ```
+3. Subscribe to the `app_mention` **Bot User Event**. Also add `message.im`
+   if you want direct messages to reach the bot (it needs the `im:history`
+   scope).
 
 4. Save changes.
 
diff --git a/examples/slack-nats-state/README.md b/examples/slack-nats-state/README.md
index 13f7a2d..9e4aa08 100644
--- a/examples/slack-nats-state/README.md
+++ b/examples/slack-nats-state/README.md
@@ -45,12 +45,9 @@ In **Event Subscriptions**:
    https://YOUR_PUBLIC_HOST/webhooks/slack
    ```
 
-3. Subscribe to these **Bot User Events**:
-
-   ```text
-   app_mention
-   message.im
-   ```
+3. Subscribe to the `app_mention` **Bot User Event**. Also add `message.im`
+   if you want direct messages to reach the bot (it needs the `im:history`
+   scope).
 
 4. Save changes.
 
@@ -77,7 +74,7 @@ Treat both values like passwords.
 
 ## Run NATS
 
-From this example directory:
+From the repository root:
 
 ```sh
 cd examples/slack-nats-state
diff --git a/examples/slack-postgres-state/README.md b/examples/slack-postgres-state/README.md
index 0e12809..fd536e8 100644
--- a/examples/slack-postgres-state/README.md
+++ b/examples/slack-postgres-state/README.md
@@ -42,12 +42,9 @@ In **Event Subscriptions**:
    https://YOUR_PUBLIC_HOST/webhooks/slack
    ```
 
-3. Subscribe to these **Bot User Events**:
-
-   ```text
-   app_mention
-   message.im
-   ```
+3. Subscribe to the `app_mention` **Bot User Event**. Also add `message.im`
+   if you want direct messages to reach the bot (it needs the `im:history`
+   scope).
 
 4. Save changes.
 
@@ -74,7 +71,7 @@ Treat both values like passwords.
 
 ## Run Postgres
 
-From this example directory:
+From the repository root:
 
 ```sh
 cd examples/slack-postgres-state
diff --git a/examples/slack-redis-state/README.md b/examples/slack-redis-state/README.md
index afd9e4d..79c0f50 100644
--- a/examples/slack-redis-state/README.md
+++ b/examples/slack-redis-state/README.md
@@ -42,12 +42,9 @@ In **Event Subscriptions**:
    https://YOUR_PUBLIC_HOST/webhooks/slack
    ```
 
-3. Subscribe to these **Bot User Events**:
-
-   ```text
-   app_mention
-   message.im
-   ```
+3. Subscribe to the `app_mention` **Bot User Event**. Also add `message.im`
+   if you want direct messages to reach the bot (it needs the `im:history`
+   scope).
 
 4. Save changes.
 
@@ -74,7 +71,7 @@ Treat both values like passwords.
 
 ## Run Redis
 
-From this example directory:
+From the repository root:
 
 ```sh
 cd examples/slack-redis-state