fix(web): deduplicate subagent navigation

docs/persistence-catalog.md

@@ -78,7 +78,7 @@ export type SessionEvent<T extends SessionEventType = SessionEventType> = {
 }[T]
 ```
 
-Sources: [`packages/core/session/src/types.ts:308`](../packages/core/session/src/types.ts) · [`packages/core/session/src/types.ts:315`](../packages/core/session/src/types.ts) · [`packages/core/session/src/types.ts:344`](../packages/core/session/src/types.ts) · [`packages/core/session/src/types.ts:376`](../packages/core/session/src/types.ts)
+Sources: [`packages/core/session/src/types.ts:314`](../packages/core/session/src/types.ts) · [`packages/core/session/src/types.ts:321`](../packages/core/session/src/types.ts) · [`packages/core/session/src/types.ts:350`](../packages/core/session/src/types.ts) · [`packages/core/session/src/types.ts:382`](../packages/core/session/src/types.ts)
 
 ## Events
 
@@ -154,7 +154,7 @@ Source: [`packages/ui/user-approval/src/index.ts:67`](../packages/ui/user-approv
 
 Types: [StreamChunk](core-data-structures/llm-streaming.md)
 
-Source: [`packages/core/session/src/types.ts:229`](../packages/core/session/src/types.ts)
+Source: [`packages/core/session/src/types.ts:235`](../packages/core/session/src/types.ts)
 
 #### `assistant/message` — surface
 
@@ -170,7 +170,7 @@ Source: [`packages/core/session/src/types.ts:229`](../packages/core/session/src/
 
 Types: [TokenUsage](core-data-structures/llm-streaming.md)
 
-Source: [`packages/core/session/src/types.ts:236`](../packages/core/session/src/types.ts)
+Source: [`packages/core/session/src/types.ts:242`](../packages/core/session/src/types.ts)
 
 ### `command/*`
 
@@ -391,7 +391,7 @@ Source: [`packages/plan/plan-mode/src/index.ts:51`](../packages/plan/plan-mode/s
 'request/context': RequestContext
 ```
 
-Source: [`packages/core/session/src/types.ts:279`](../packages/core/session/src/types.ts)
+Source: [`packages/core/session/src/types.ts:285`](../packages/core/session/src/types.ts)
 
 #### `request/header` — log-only
 
@@ -403,7 +403,7 @@ Source: [`packages/core/session/src/types.ts:279`](../packages/core/session/src/
 'request/header': { header: EpochHeader; reason: RequestHeaderReason }
 ```
 
-Source: [`packages/core/session/src/types.ts:269`](../packages/core/session/src/types.ts)
+Source: [`packages/core/session/src/types.ts:275`](../packages/core/session/src/types.ts)
 
 ### `sandbox/*`
 
@@ -458,7 +458,7 @@ Source: [`packages/sandbox/sandbox-policy/src/session-mode.ts:33`](../packages/s
 'session/end-seed': Record<string, never>
 ```
 
-Source: [`packages/core/session/src/types.ts:304`](../packages/core/session/src/types.ts)
+Source: [`packages/core/session/src/types.ts:310`](../packages/core/session/src/types.ts)
 
 #### `session/title` — log-only
 
@@ -494,7 +494,7 @@ Source: [`packages/session-title/session-title-llm/src/index.ts:43`](../packages
 'steering/message': { turn: number; message: UserMessage }
 ```
 
-Source: [`packages/core/session/src/types.ts:262`](../packages/core/session/src/types.ts)
+Source: [`packages/core/session/src/types.ts:268`](../packages/core/session/src/types.ts)
 
 ### `step/*`
 
@@ -505,7 +505,7 @@ Source: [`packages/core/session/src/types.ts:262`](../packages/core/session/src/
 'step/end': { turn: number; step: number }
 ```
 
-Source: [`packages/core/session/src/types.ts:218`](../packages/core/session/src/types.ts)
+Source: [`packages/core/session/src/types.ts:224`](../packages/core/session/src/types.ts)
 
 #### `step/start` — log-only
 
@@ -514,7 +514,7 @@ Source: [`packages/core/session/src/types.ts:218`](../packages/core/session/src/
 'step/start': { turn: number; step: number }
 ```
 
-Source: [`packages/core/session/src/types.ts:216`](../packages/core/session/src/types.ts)
+Source: [`packages/core/session/src/types.ts:222`](../packages/core/session/src/types.ts)
 
 ### `subagent/*`
 
@@ -544,7 +544,7 @@ Source: [`packages/subagent/subagent/src/descriptor.ts:32`](../packages/subagent
 
 Types: [TodoItem](core-data-structures/session.md)
 
-Source: [`packages/core/session/src/types.ts:264`](../packages/core/session/src/types.ts)
+Source: [`packages/core/session/src/types.ts:270`](../packages/core/session/src/types.ts)
 
 ### `tool/*`
 
@@ -561,7 +561,7 @@ Source: [`packages/core/session/src/types.ts:264`](../packages/core/session/src/
 
 Types: [CallId](core-data-structures/core.md)
 
-Source: [`packages/core/session/src/types.ts:242`](../packages/core/session/src/types.ts)
+Source: [`packages/core/session/src/types.ts:248`](../packages/core/session/src/types.ts)
 
 #### `tool/code-dispatch` — log-only
 
@@ -634,7 +634,7 @@ Source: [`packages/core/tools/src/code-mode.ts:33`](../packages/core/tools/src/c
 }
 ```
 
-Source: [`packages/core/session/src/types.ts:254`](../packages/core/session/src/types.ts)
+Source: [`packages/core/session/src/types.ts:260`](../packages/core/session/src/types.ts)
 
 ### `turn/*`
 
@@ -652,7 +652,7 @@ Source: [`packages/core/session/src/types.ts:254`](../packages/core/session/src/
 
 Types: [TurnEndReason](core-data-structures/session.md)
 
-Source: [`packages/core/session/src/types.ts:214`](../packages/core/session/src/types.ts)
+Source: [`packages/core/session/src/types.ts:220`](../packages/core/session/src/types.ts)
 
 #### `turn/start` — log-only
 
@@ -665,7 +665,7 @@ Source: [`packages/core/session/src/types.ts:214`](../packages/core/session/src/
 
 Types: [TurnTrigger](core-data-structures/session.md)
 
-Source: [`packages/core/session/src/types.ts:207`](../packages/core/session/src/types.ts)
+Source: [`packages/core/session/src/types.ts:213`](../packages/core/session/src/types.ts)
 
 ### `user/*`
 
@@ -683,7 +683,7 @@ Source: [`packages/core/session/src/types.ts:207`](../packages/core/session/src/
 'user/message': UserMessage
 ```
 
-Source: [`packages/core/session/src/types.ts:227`](../packages/core/session/src/types.ts)
+Source: [`packages/core/session/src/types.ts:233`](../packages/core/session/src/types.ts)
 
 ### `web/*`