Merge remote-tracking branch 'origin/master' into worktree/web-multimodal-image-input

# Conflicts:
#	.agents/notes/implemented/architecture/2026-07-05-reconstructable-requests.i18n.yaml
#	docs/core-data-structures/core.i18n.yaml
#	docs/module-graph.md
#	packages/client/ui-conversation/src/client/chat/AssistantMarkdown.tsx
#	packages/client/ui-conversation/src/client/index.ts
#	packages/compact/compact-basic/README.i18n.yaml

packages/host/apiproxy/src/api-proxy.ts

@@ -20,6 +20,7 @@ import type { SessionPersistence } from '@deepseek-ai/dsh-session-persistence'
 import { SessionQueryError, type SessionSearchCursor } from '@deepseek-ai/dsh-session-query'
 import { SubagentError } from '@deepseek-ai/dsh-subagent'
 import type { SubagentListEntry as CatalogSubagentListEntry } from '@deepseek-ai/dsh-subagent'
+import { isUserInvocable } from '@deepseek-ai/dsh-skill'
 import type { Workspace, WorkspaceRecord } from '@deepseek-ai/dsh-workspace'
 import {
   workspaceDomainState, workspaceRecord, WorkspaceId as brandWorkspaceId,
@@ -1363,6 +1364,34 @@ export function createApiProxy(ctx: Context, defaults: ApiProxyDefaults): ApiPro
     return llm === undefined || llm.listProviders().some(entry => entry.id === provider)
   }
 
+  /**
+   * Resolve the addressed agent for a turn-starting method and refuse when no
+   * adapter serves its current route: a route nothing serves cannot start a
+   * turn, and letting it try spends the whole pre-step path to fail inside
+   * the adapter with a message about registration. Refusing here names the
+   * model the session is pointed at while the draft is still in the composer.
+   * This is `session.prompt`'s enforcement boundary: a client that disables
+   * its input is an affordance, and the method stays callable regardless.
+   */
+  async function turnAgentFor<T>(
+    request: RpcRequest<unknown>, sessionId: SessionId,
+  ): Promise<{ agent: Agent } | { refused: RpcResponse<T> }> {
+    const found = await agentFor(sessionId)
+    if ('error' in found) return { refused: err(request, found.error) }
+    const agent = found.agent
+    const target = targetFor(agent).current
+    if (!routeServed(target.provider)) {
+      return {
+        refused: err(request, {
+          code: 'model-unavailable',
+          message: `no adapter serves provider "${target.provider}"; select a model for this session`,
+          details: { provider: target.provider, model: target.model },
+        }),
+      }
+    }
+    return { agent }
+  }
+
   /** Missing-service report shared by the settings domain (skills-domain stance). */
   function settingsAbsent(): RpcError {
     return { code: 'internal', message: 'settings service is absent: this deployment does not mount a settings provider (e.g. @deepseek-ai/dsh-settings-local) in its composition', details: {} }
@@ -1909,23 +1938,9 @@ export function createApiProxy(ctx: Context, defaults: ApiProxyDefaults): ApiPro
 
       async prompt(request) {
         const { sessionId, mode, content } = request.payload
-        const found = await agentFor(sessionId)
-        if ('error' in found) return err(request, found.error)
-        const agent = found.agent
-        // A route no adapter serves cannot start a turn, and letting it try
-        // spends the whole pre-step path to fail inside the adapter with a
-        // message about registration. Refusing here names the model the
-        // session is pointed at while the draft is still in the composer.
-        // This is the enforcement boundary: a client that disables its input
-        // is an affordance, and this method stays callable regardless.
-        const target = targetFor(agent).current
-        if (!routeServed(target.provider)) {
-          return err(request, {
-            code: 'model-unavailable',
-            message: `no adapter serves provider "${target.provider}"; select a model for this session`,
-            details: { provider: target.provider, model: target.model },
-          })
-        }
+        const resolved = await turnAgentFor<{ accepted: true }>(request, sessionId)
+        if ('refused' in resolved) return resolved.refused
+        const agent = resolved.agent
         // The rpcId rides MessageSource into user/message (merge declaration in api/sessions.ts; provisional correlation).
         const source: MessageSource = { kind: 'user', rpcId: request.rpcId }
         const hasImage = content.some(part => part.type === 'image')
@@ -2568,13 +2583,13 @@ export function createApiProxy(ctx: Context, defaults: ApiProxyDefaults): ApiPro
           return err(request, { code: 'internal', message: 'skill registry is absent: this deployment does not mount @deepseek-ai/dsh-skill in its composition (cordis.yml or explicit assembly)', details: {} })
         }
         try {
-          const skills = (await skillRegistry.list({ cwd }))
-            .filter(skill => skill.invocation.modelInvocable && skill.invocation.userInvocable)
+          const skills = (await skillRegistry.list({ cwd })).filter(isUserInvocable)
           return ok(request, {
             skills: skills.map(skill => ({
               name: skill.name,
               description: skill.description,
               ...skill.whenToUse === undefined ? {} : { whenToUse: skill.whenToUse },
+              modelInvocable: skill.invocation.modelInvocable,
             })),
           })
         } catch (error: unknown) {