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/compact/compact-basic/src/summarizer.ts

@@ -85,16 +85,27 @@ export interface SummarizationInput {
 }
 
 /** Safe summary content plus the exact auxiliary call envelope recorded in provenance. */
-export interface SummaryResult {
+export type SummaryResult = {
   summary: ContentBlock[]
-  /** Complete provider output before the text-only summary projection. */
-  rawOutput?: ContentBlock[]
   provider: string
   model: string
   maxTokens?: number
   /** Provider-reported usage for this summarization request. */
   usage?: TokenUsage
-}
+} & (
+  | {
+    /** Complete provider output before the text-only summary projection. */
+    rawOutput: ContentBlock[]
+    /** Identifies exactly one call through this context's `ctx.llm.stream()`. */
+    llmStreamCall: true
+  }
+  | {
+    /** Optional complete output from an unmarked template, remote, or other summarizer. */
+    rawOutput?: ContentBlock[]
+    /** An unmarked result does not identify a call through this context's LLM seam. */
+    llmStreamCall?: never
+  }
+)
 
 /**
  * Run the default cache-reusing `ctx.llm.stream()` summarization call: replay
@@ -162,6 +173,7 @@ export async function summarizeWithLlm(
   return {
     summary,
     rawOutput,
+    llmStreamCall: true,
     provider: options.provider,
     model: options.model,
     maxTokens: config.maxTokens,