fix(headless): dsh run is a direct core front door

packages/host/apiproxy/src/index.ts

@@ -7,28 +7,24 @@
  * `ctx.apiProxy`). Transport-agnostic by design: this package registers no
  * routes — physical carriers wrap `ctx.apiProxy` themselves.
  *
- * The gateway also owns the `api-gateway` settings section: the route a
- * session starts from when its own log names none. The composition entry is
- * the shipped default and the section layers the user's choice over it, so
- * switching models in a conversation is what sets the default for the next
- * one. Sessions that have already logged a route are never retargeted by it.
+ * The gateway consumes `ctx.agentDefaultModel`, the transport-independent default
+ * shared with direct front doors. Switching models persists through that
+ * service; sessions that have already logged a selection remain unchanged.
  */
 
 import { resolve } from 'node:path'
 import { Context, Service } from 'cordis'
 import z from 'schemastery'
-import type { AgentLlmTarget } from '@deepseek-ai/dsh-agent'
-import { ReasoningEffortId } from '@deepseek-ai/dsh-llm'
-import { installSettingsSection } from '@deepseek-ai/dsh-settings'
+import type {} from '@deepseek-ai/dsh-agent-default-model'
 import type { ApiProxy } from './api/index.ts'
-import { API_GATEWAY_SETTINGS_NAMESPACE, createApiProxy } from './api-proxy.ts'
+import { createApiProxy } from './api-proxy.ts'
 
 export type * from './api/index.ts'
 export { RpcId } from './api/rpc.ts'
 export { toFetchHandler } from './fetch/handler.ts'
 export { AbstractApiClient, InProcessApiClient } from './fetch/client.ts'
 export type { IApiClient } from './fetch/client.ts'
-export { API_GATEWAY_SETTINGS_NAMESPACE, createApiProxy } from './api-proxy.ts'
+export { createApiProxy } from './api-proxy.ts'
 export type { ApiProxyDefaults } from './api-proxy.ts'
 
 declare module 'cordis' {
@@ -38,62 +34,12 @@ declare module 'cordis' {
   }
 }
 
-/**
- * The `api-gateway` settings section: the route a session starts from when its
- * own log names none. `workspaceRoot` is deliberately not part of it — that is
- * a launcher fact, not a preference.
- */
-export interface DefaultRouteSettings {
-  /** Default provider route for created agents. */
-  provider: string
-  /** Default model id. */
-  model: string
-  /** Default reasoning effort; absence preserves the adapter/provider default. */
-  reasoningEffort?: string
-}
-
-/**
- * Gateway plugin config: host-level agent routing and Workspace creation root.
- *
- * `reasoningEffort` is deliberately absent, so the section carries one field
- * the composition cannot. The seam resolves a section by MERGING the user
- * layer over the composition entry per field, and an absent key cannot
- * override a present one — so a composition-set effort would survive every
- * later switch to a model that has none, and strand it for the next session
- * to fail on. Effort is a per-model fact anyway: a deployment default belongs
- * on the adapter profile (`llm-pi-ai`'s `reasoning`, `llm-deepseek`'s own),
- * which resolves per model rather than per gateway.
- */
+/** Gateway plugin config: the Host-only Workspace creation root. */
 export interface Config {
-  /** Default provider route for created agents. */
-  provider: string
-  /** Default model id. */
-  model: string
   /** Parent directory for name-created Workspaces; defaults to the Host cwd. */
   workspaceRoot?: string
 }
 
-/**
- * Schema of the `api-gateway` section, exported because it IS that section's
- * contract — the shape anything reading or writing `settings.yaml` addresses.
- */
-export const DEFAULT_ROUTE_SCHEMA: z<DefaultRouteSettings> = z.object({
-  provider: z.string().required(),
-  model: z.string().required(),
-  reasoningEffort: z.string(),
-})
-
-/** Project the stored/composed section onto the agent-facing target shape. */
-function routeTarget(settings: DefaultRouteSettings): AgentLlmTarget {
-  return {
-    provider: settings.provider,
-    model: settings.model,
-    ...settings.reasoningEffort === undefined
-      ? {}
-      : { reasoningEffort: ReasoningEffortId(settings.reasoningEffort) },
-  }
-}
-
 /**
  * The API gateway service: implements the ApiProxy contract over the composed
  * host context and provides it as `ctx.apiProxy`. The Host cwd is the default
@@ -101,13 +47,11 @@ function routeTarget(settings: DefaultRouteSettings): AgentLlmTarget {
  */
 export class ApiProxyService extends Service implements ApiProxy {
   static inject = [
-    'agents', 'directoryPicker', 'llm', 'sessions', 'subagents', 'sessionQuery',
+    'agentDefaultModel', 'agents', 'directoryPicker', 'llm', 'sessions', 'subagents', 'sessionQuery',
     'tools', 'userInteraction', 'workspace',
   ]
 
   static Config: z<Config> = z.object({
-    provider: z.string().required(),
-    model: z.string().required(),
     workspaceRoot: z.string(),
   })
 
@@ -127,30 +71,9 @@ export class ApiProxyService extends Service implements ApiProxy {
   constructor(ctx: Context, config: Config) {
     super(ctx, 'apiProxy')
     const cwd = process.cwd()
-    // The composition entry is the shipped default; the settings section
-    // layers the user's own choice over it, and a deployment without a
-    // settings provider simply keeps the entry.
-    const entry: DefaultRouteSettings = { provider: config.provider, model: config.model }
-    let route: () => DefaultRouteSettings = () => entry
-    installSettingsSection(ctx, API_GATEWAY_SETTINGS_NAMESPACE, DEFAULT_ROUTE_SCHEMA, entry, {
-      setSource: (current) => {
-        route = current
-      },
-      // Nothing registration-level derives from the default: every consumer
-      // reads it through the thunk at the moment it needs a route.
-      onChange: () => {},
-    })
     const api = createApiProxy(ctx, {
-      defaultTarget: () => routeTarget(route()),
-      // Wholesale, never a merge: switching to a model with no reasoning
-      // effort must clear a stored one, and a merged patch would strand it
-      // for the next session to fail on. This clears it because the entry
-      // below the user layer carries no effort to re-inherit — the reason
-      // `Config` deliberately has no such field. The section holds no
-      // secrets, so there is nothing a replace can collaterally drop.
-      persistDefaultTarget: async (target) => {
-        await ctx.get('settings')?.replace(API_GATEWAY_SETTINGS_NAMESPACE, target)
-      },
+      defaultModelSelection: () => ctx.agentDefaultModel.currentSelection(),
+      saveDefaultModelSelection: selection => ctx.agentDefaultModel.saveSelection(selection),
       cwd,
       workspaceRoot: resolve(config.workspaceRoot ?? cwd),
     })