refactor(agent): unify sourced message delivery

docs/persistence-catalog.md

@@ -78,7 +78,7 @@ export type SessionEvent<T extends SessionEventType = SessionEventType> = {
 }[T]
 ```
 
-Sources: [`packages/core/session/src/types.ts:288`](../packages/core/session/src/types.ts) · [`packages/core/session/src/types.ts:301`](../packages/core/session/src/types.ts) · [`packages/core/session/src/types.ts:330`](../packages/core/session/src/types.ts) · [`packages/core/session/src/types.ts:362`](../packages/core/session/src/types.ts)
+Sources: [`packages/core/session/src/types.ts:270`](../packages/core/session/src/types.ts) · [`packages/core/session/src/types.ts:283`](../packages/core/session/src/types.ts) · [`packages/core/session/src/types.ts:312`](../packages/core/session/src/types.ts) · [`packages/core/session/src/types.ts:344`](../packages/core/session/src/types.ts)
 
 ## Events
 
@@ -150,7 +150,7 @@ 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:234`](../packages/core/session/src/types.ts)
+Source: [`packages/core/session/src/types.ts:216`](../packages/core/session/src/types.ts)
 
 #### `assistant/message` — surface
 
@@ -166,7 +166,7 @@ Source: [`packages/core/session/src/types.ts:234`](../packages/core/session/src/
 
 Types: [ContentBlock](core-data-structures/core.md) · [TokenUsage](core-data-structures/llm-streaming.md)
 
-Source: [`packages/core/session/src/types.ts:241`](../packages/core/session/src/types.ts)
+Source: [`packages/core/session/src/types.ts:223`](../packages/core/session/src/types.ts)
 
 ### `compact/*`
 
@@ -315,22 +315,6 @@ Source: [`packages/ui/permission/src/index.ts:36`](../packages/ui/permission/src
 
 Source: [`packages/plan/plan-mode/src/index.ts:41`](../packages/plan/plan-mode/src/index.ts)
 
-### `prompt/*`
-
-#### `prompt/blocked` — log-only
-
-```ts persistence-catalog
-/**
- * Durable record of a prompt veto and its reason. It is log-only: the blocked
- * prompt never enters the model-visible surface, and its turn runs zero steps.
- */
-'prompt/blocked': { content: ContentBlock[]; source: MessageSource; reason: string }
-```
-
-Types: [ContentBlock](core-data-structures/core.md) · [MessageSource](core-data-structures/core.md)
-
-Source: [`packages/core/session/src/types.ts:232`](../packages/core/session/src/types.ts)
-
 ### `request/*`
 
 #### `request/header` — log-only
@@ -343,7 +327,7 @@ Source: [`packages/core/session/src/types.ts:232`](../packages/core/session/src/
 'request/header': { header: EpochHeader; reason: RequestHeaderReason }
 ```
 
-Source: [`packages/core/session/src/types.ts:276`](../packages/core/session/src/types.ts)
+Source: [`packages/core/session/src/types.ts:258`](../packages/core/session/src/types.ts)
 
 ### `sandbox/*`
 
@@ -399,7 +383,7 @@ Source: [`packages/session-title/session-title-llm/src/index.ts:44`](../packages
 'steering/message': UserMessageData & { turn: number }
 ```
 
-Source: [`packages/core/session/src/types.ts:269`](../packages/core/session/src/types.ts)
+Source: [`packages/core/session/src/types.ts:251`](../packages/core/session/src/types.ts)
 
 ### `step/*`
 
@@ -410,7 +394,7 @@ Source: [`packages/core/session/src/types.ts:269`](../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:205`](../packages/core/session/src/types.ts)
 
 #### `step/start` — log-only
 
@@ -419,7 +403,7 @@ 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:203`](../packages/core/session/src/types.ts)
 
 ### `todo/*`
 
@@ -432,7 +416,7 @@ Source: [`packages/core/session/src/types.ts:216`](../packages/core/session/src/
 
 Types: [TodoItem](core-data-structures/session.md)
 
-Source: [`packages/core/session/src/types.ts:271`](../packages/core/session/src/types.ts)
+Source: [`packages/core/session/src/types.ts:253`](../packages/core/session/src/types.ts)
 
 ### `tool/*`
 
@@ -449,7 +433,7 @@ Source: [`packages/core/session/src/types.ts:271`](../packages/core/session/src/
 
 Types: [CallId](core-data-structures/core.md)
 
-Source: [`packages/core/session/src/types.ts:247`](../packages/core/session/src/types.ts)
+Source: [`packages/core/session/src/types.ts:229`](../packages/core/session/src/types.ts)
 
 #### `tool/code-dispatch` — log-only
 
@@ -503,7 +487,7 @@ Source: [`packages/core/tools/src/code-mode.ts:34`](../packages/core/tools/src/c
 
 Types: [CallId](core-data-structures/core.md) · [ContentBlock](core-data-structures/core.md)
 
-Source: [`packages/core/session/src/types.ts:259`](../packages/core/session/src/types.ts)
+Source: [`packages/core/session/src/types.ts:241`](../packages/core/session/src/types.ts)
 
 ### `turn/*`
 
@@ -521,7 +505,7 @@ Source: [`packages/core/session/src/types.ts:259`](../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:201`](../packages/core/session/src/types.ts)
 
 #### `turn/start` — log-only
 
@@ -534,7 +518,7 @@ 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:194`](../packages/core/session/src/types.ts)
 
 ### `user/*`
 
@@ -552,4 +536,4 @@ Source: [`packages/core/session/src/types.ts:207`](../packages/core/session/src/
 'user/message': UserMessageData
 ```
 
-Source: [`packages/core/session/src/types.ts:227`](../packages/core/session/src/types.ts)
+Source: [`packages/core/session/src/types.ts:214`](../packages/core/session/src/types.ts)