fix(web): generate model-backed session titles

packages/host/runtime/src/boot.ts

@@ -9,6 +9,8 @@ import Timer from '@cordisjs/plugin-timer'
 import LlmService from '@deepseek-ai/dsh-llm'
 import SessionStore from '@deepseek-ai/dsh-session'
 import SessionTitleService, { type Config as SessionTitleConfig } from '@deepseek-ai/dsh-session-title'
+import * as SessionTitleFirstMessageLlm from '@deepseek-ai/dsh-session-title-first-message-llm'
+import type { Config as SessionTitleLlmConfig } from '@deepseek-ai/dsh-session-title-first-message-llm'
 import SystemPrompt from '@deepseek-ai/dsh-system-prompt'
 import ToolRegistry from '@deepseek-ai/dsh-tools'
 import AgentRegistry from '@deepseek-ai/dsh-agent'
@@ -46,6 +48,15 @@ const DEFAULT_SESSION_TITLE_CONFIG: SessionTitleConfig = {
   maxTitleBytes: 80,
 }
 
+/** Default first-message model-title policy for sessions created through the host. */
+const DEFAULT_SESSION_TITLE_LLM_CONFIG: SessionTitleLlmConfig = {
+  targetWords: 5,
+  targetCjkCharacters: 10,
+  maxInputBytes: 4_096,
+  maxOutputTokens: 64,
+  timeoutMs: 60_000,
+}
+
 /** Options for bootHost — the assembly-layer composition knobs. */
 export interface BootHostOptions {
   /** Root directory for JSONL session persistence. */
@@ -54,8 +65,10 @@ export interface BootHostOptions {
   provider?: string
   /** Default model id (defaults to 'deepseek-v4-flash', matching the demos). */
   model?: string
-  /** Deterministic fallback-title limits; no asynchronous title provider is mounted by the host. */
+  /** Deterministic fallback-title limits. */
   sessionTitle?: SessionTitleConfig
+  /** First-message model-title policy; omitted provider/model inherit the session's logged main-request route. */
+  sessionTitleLlm?: SessionTitleLlmConfig
   /**
    * Default project directory for sessions created without an explicit cwd
    * (defaults to the host process working directory). A session's cwd is its
@@ -100,6 +113,7 @@ export async function bootHost(options: BootHostOptions): Promise<HostHandle> {
   await ctx.plugin(LlmService)
   await ctx.plugin(SessionStore)
   await ctx.plugin(SessionTitleService, options.sessionTitle ?? DEFAULT_SESSION_TITLE_CONFIG)
+  await ctx.plugin(SessionTitleFirstMessageLlm, options.sessionTitleLlm ?? DEFAULT_SESSION_TITLE_LLM_CONFIG)
   await ctx.plugin(SystemPrompt, { persona: '' })
   await ctx.plugin(ToolRegistry)
   await ctx.plugin(AgentRegistry)