fix(web): fence request telemetry lifecycles

packages/host/apiproxy/package.json

@@ -60,9 +60,15 @@
     "zod": "^4.4.3"
   },
   "peerDependencies": {
+    "@deepseek-ai/dsh-token-meter": "^0.0.1",
     "cordis": "^4.0.0-rc.7",
     "@deepseek-ai/dsh-invariants": "^0.0.1"
   },
+  "peerDependenciesMeta": {
+    "@deepseek-ai/dsh-token-meter": {
+      "optional": true
+    }
+  },
   "devDependencies": {
     "@deepseek-ai/dsh-storage": "workspace:^",
     "@deepseek-ai/dsh-storage-domain": "workspace:^",

packages/host/apiproxy/src/api/events.schema.ts

@@ -41,7 +41,7 @@ export const muxFrameSchema = z.discriminatedUnion('type', [
     type: z.literal('session/model-request'),
     sessionId: sessionIdSchema,
     turn: z.number().int().positive(),
-    step: z.number().int().nonnegative(),
+    step: z.number().int().positive(),
     provider: z.string().min(1),
     model: z.string().min(1),
     contextTokens: z.number().int().nonnegative().optional(),

packages/host/apiproxy/src/api/events.ts

@@ -33,6 +33,12 @@ export type ToolEventView =
 
 /** Atomic telemetry captured at one observed model-request boundary. */
 export interface ModelRequestTelemetry {
+  /**
+   * Agent request identity and resolved route. The current StatsLine consumes
+   * only occupancy, while the complete snapshot preserves provenance for
+   * diagnostics and later request-bound consumers without consulting mutable
+   * selected-model state.
+   */
   turn: number
   step: number
   provider: string

packages/host/apiproxy/tests/api-proxy-models.spec.ts

@@ -13,7 +13,8 @@ import type {
   GenerateOptions, LlmCallConfig, LlmModelInfo, LlmModelReasoningInfo, LlmProviderInfo,
   LlmResolvedModelInfo, StreamChunk,
 } from '@deepseek-ai/dsh-llm'
-import SessionStore, { SessionId } from '@deepseek-ai/dsh-session'
+import SessionStore from '@deepseek-ai/dsh-session'
+import type { SessionId } from '@deepseek-ai/dsh-session'
 import SystemPrompt from '@deepseek-ai/dsh-system-prompt'
 import UserInteractionService from '@deepseek-ai/dsh-user-interaction'
 import type { RpcRequest } from '@deepseek-ai/dsh-host-apiproxy/api/rpc'
@@ -51,7 +52,6 @@ class CatalogAdapter extends LlmAdapter {
       provider,
       id: model,
       name: model,
-      context: { contextWindow: model === 'private-preview' ? 128_000 : 64_000 },
       ...this.reasoning === undefined ? {} : { reasoning: this.reasoning },
     })
   }
@@ -70,7 +70,15 @@ const REASONING: LlmModelReasoningInfo = {
   defaultEffort: ReasoningEffortId('high'),
 }
 
-async function hostContext(): Promise<Context> {
+async function harness(logged?: {
+  provider: string
+  model: string
+  reasoningEffort?: ReasoningEffortId
+}): Promise<{
+  ctx: Context
+  agent: Agent
+  sessionId: SessionId
+}> {
   const ctx = new Context()
   await ctx.plugin(SessionStore)
   await ctx.plugin(SystemPrompt, { persona: '' })
@@ -90,19 +98,6 @@ async function hostContext(): Promise<Context> {
     { provider: 'duplicate', id: 'same', name: 'Same' },
     { provider: 'duplicate', id: 'same', name: 'Same Again' },
   ]))
-  return ctx
-}
-
-async function harness(logged?: {
-  provider: string
-  model: string
-  reasoningEffort?: ReasoningEffortId
-}): Promise<{
-  ctx: Context
-  agent: Agent
-  sessionId: SessionId
-}> {
-  const ctx = await hostContext()
   const session = ctx.sessions.create()
   if (logged !== undefined) {
     session.append('request/header', { header: { config: logged }, reason: 'initial' })
@@ -129,12 +124,7 @@ describe('Web session model selection', () => {
       model: 'private-preview',
       reasoningEffort: ReasoningEffortId('max'),
     })
-    const api = createApiProxy(ctx, {
-      provider: 'deepseek',
-      model: 'deepseek-chat',
-      cwd: '/tmp',
-      workspaceRoot: '/tmp',
-    })
+    const api = createApiProxy(ctx, { provider: 'deepseek', model: 'deepseek-chat', cwd: '/tmp', workspaceRoot: '/tmp' })
 
     const catalog = expectValue(await api.sessions.models(request({ sessionId })))
     expect(catalog.current).toEqual({
@@ -175,12 +165,7 @@ describe('Web session model selection', () => {
 
   it('accepts an advisory-unlisted model, rejects an unavailable provider, and switches only after the next assembly', async () => {
     const { ctx, agent, sessionId } = await harness()
-    const api = createApiProxy(ctx, {
-      provider: 'deepseek',
-      model: 'deepseek-chat',
-      cwd: '/tmp',
-      workspaceRoot: '/tmp',
-    })
+    const api = createApiProxy(ctx, { provider: 'deepseek', model: 'deepseek-chat', cwd: '/tmp', workspaceRoot: '/tmp' })
     const seed: LlmCallConfig = { provider: 'seed', model: 'seed', temperature: 0.2 }
     const signal = new AbortController().signal
 

packages/host/apiproxy/tests/rpc-schemas.spec.ts

@@ -365,7 +365,7 @@ describe('events frame schemas', () => {
         type: 'session/model-request',
         sessionId: 's',
         turn: 2,
-        step: 0,
+        step: 1,
         provider: 'deepseek',
         model: 'deepseek-chat',
         contextTokens: 8_000,
@@ -392,7 +392,7 @@ describe('events frame schemas', () => {
     expect(() => muxFrameSchema.parse({ type: 'unknown/frame' })).toThrow()
     for (const invalid of [
       { type: 'session/model-request', sessionId: 's', turn: 0, step: 1, provider: 'p', model: 'm' },
-      { type: 'session/model-request', sessionId: 's', turn: 1, step: -1, provider: 'p', model: 'm' },
+      { type: 'session/model-request', sessionId: 's', turn: 1, step: 0, provider: 'p', model: 'm' },
       { type: 'session/model-request', sessionId: 's', turn: 1, step: 1, provider: 'p', model: 'm', contextTokens: -1 },
       { type: 'session/model-request', sessionId: 's', turn: 1, step: 1, provider: 'p', model: 'm', contextWindow: 0 },
       { type: 'session/projection', sessionId: 's', key: '', value: null, seq: 0 },