refactor(agent-loop): simplify observable state machine

docs/config-catalog.md

@@ -27,7 +27,7 @@ export interface AcpConfig {
 
 Depends on: `Stream` (`@agentclientprotocol/sdk`)
 
-Source: [`packages/ui/acp/src/index.ts:285`](../packages/ui/acp/src/index.ts)
+Source: [`packages/ui/acp/src/index.ts:286`](../packages/ui/acp/src/index.ts)
 
 ## `@deepseek-ai/dsh-acp-demo`
 
@@ -113,7 +113,7 @@ export interface Config {
 
 Depends on: [`AgentOptions`](core-data-structures/core.md) · [`SessionId`](core-data-structures/core.md)
 
-Source: [`packages/core/agent-loop/src/index.ts:360`](../packages/core/agent-loop/src/index.ts)
+Source: [`packages/core/agent-loop/src/index.ts:147`](../packages/core/agent-loop/src/index.ts)
 
 ## `@deepseek-ai/dsh-agent-spine-demo`
 
@@ -318,7 +318,7 @@ Requires: `llm` · `tokenMeter`
 export interface BasicCompactConfig extends CompactPolicyConfig {
   /** Exact provider/model overrides; duplicate targets fail plugin load. */
   modelPolicies?: ModelCompactPolicyConfig[]
-  /** Enable automatic post-step pressure and overflow-recovery listeners. Defaults to `true`. */
+  /** Enable automatic step-boundary pressure and overflow-recovery listeners. Defaults to `true`. */
   auto?: boolean
 }
 
@@ -411,7 +411,7 @@ export interface Config {
 }
 ```
 
-Source: [`packages/goal/goal/src/index.ts:56`](../packages/goal/goal/src/index.ts)
+Source: [`packages/goal/goal/src/index.ts:55`](../packages/goal/goal/src/index.ts)
 
 ## `@deepseek-ai/dsh-hooks-claude`
 
@@ -1063,7 +1063,7 @@ export interface Config {
 }
 ```
 
-Source: [`packages/session-title/session-title/src/index.ts:70`](../packages/session-title/session-title/src/index.ts)
+Source: [`packages/session-title/session-title/src/index.ts:69`](../packages/session-title/session-title/src/index.ts)
 
 ## `@deepseek-ai/dsh-session-title-all-messages-llm`
 
@@ -1367,7 +1367,7 @@ export interface Config {
 }
 ```
 
-Source: [`packages/goal/tool-goal/src/index.ts:27`](../packages/goal/tool-goal/src/index.ts)
+Source: [`packages/goal/tool-goal/src/index.ts:25`](../packages/goal/tool-goal/src/index.ts)
 
 ## `@deepseek-ai/dsh-tool-lsp`
 
@@ -1435,7 +1435,7 @@ export interface Config {
 }
 ```
 
-Source: [`packages/skill/tool-skill/src/index.ts:19`](../packages/skill/tool-skill/src/index.ts)
+Source: [`packages/skill/tool-skill/src/index.ts:20`](../packages/skill/tool-skill/src/index.ts)
 
 ## `@deepseek-ai/dsh-tool-subagent`
 
@@ -1567,7 +1567,7 @@ export interface Config {
 export type ToolPresentationMode = 'native' | 'code' | 'both'
 ```
 
-Source: [`packages/core/tools/src/index.ts:529`](../packages/core/tools/src/index.ts)
+Source: [`packages/core/tools/src/index.ts:534`](../packages/core/tools/src/index.ts)
 
 ## `@deepseek-ai/dsh-tui`
 
@@ -1631,7 +1631,7 @@ export interface TuiConfig {
 }
 ```
 
-Source: [`packages/ui/tui/src/index.ts:270`](../packages/ui/tui/src/index.ts)
+Source: [`packages/ui/tui/src/index.ts:268`](../packages/ui/tui/src/index.ts)
 
 ## `@deepseek-ai/dsh-tui-demo`