feat(sf): persist escalation resolutions as durable memories

When an escalation is resolved (auto-mode accept or user override), write
the choice + rationale into the memories table with category="architecture".
The "[escalation:<task>] <question>. Chose: <option>. Rationale: ..."
prefix mirrors the decisions->memories backfill format so search and
de-duplication work the same way.

Why: getActiveMemoriesRanked auto-injects top memories into every
execute-task prompt, so a resolved escalation now travels forward as
implicit context across the whole project — not just the immediate
carry-forward into the next task. The artifact JSON stays as the audit
trail; the memory is the discoverable, semantically-ranked surface.

Best-effort write — never blocks resolution.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/resources/extensions/sf/escalation.ts

@@ -8,6 +8,7 @@ import { existsSync, mkdirSync, readFileSync } from "node:fs";
 import { dirname, join } from "node:path";
 
 import { atomicWriteSync } from "./atomic-write.js";
+import { createMemory } from "./memory-store.js";
 import { resolveSlicePath } from "./paths.js";
 import type { TaskRow } from "./sf-db.js";
 import {
@@ -375,6 +376,26 @@ export function resolveEscalation(
 		}),
 	);
 
+	// Persist as a durable memory so the choice + rationale auto-injects into
+	// future prompts via getActiveMemoriesRanked. Mirrors the decisions->memories
+	// backfill pattern (category="architecture", "[decision:<id>] ..." prefix).
+	// Best-effort — never block resolution if the memory write fails.
+	try {
+		const memoryContent = formatEscalationMemoryContent(art, chosenOption, rationale);
+		createMemory({
+			category: "architecture",
+			content: memoryContent,
+			confidence: 0.85,
+			source_unit_type: "execute-task",
+			source_unit_id: taskId,
+		});
+	} catch (memoryErr) {
+		logWarning(
+			"tool",
+			`escalation: failed to persist resolution as memory: ${(memoryErr as Error).message}`,
+		);
+	}
+
 	return {
 		status: "resolved",
 		message: `Escalation resolved. Next ${sliceId} dispatch will run normally.`,
@@ -382,3 +403,28 @@ export function resolveEscalation(
 		chosenOption,
 	};
 }
+
+/** Synthesize a 1–3 sentence memory line from a resolved escalation artifact.
+ *  The "[escalation:<task>]" prefix mirrors the decisions->memories backfill
+ *  format so de-duplication and search work the same way. */
+function formatEscalationMemoryContent(
+	art: EscalationArtifact,
+	chosenOption: EscalationOption | undefined,
+	userRationale: string,
+): string {
+	const choiceLabel = chosenOption
+		? `${chosenOption.label} (${chosenOption.id})`
+		: "unknown";
+	const rationale = userRationale.trim()
+		? userRationale.trim()
+		: art.recommendationRationale;
+	const tradeoffs = chosenOption?.tradeoffs?.trim();
+	return [
+		`[escalation:${art.taskId}] ${art.question}`,
+		`Chose: ${choiceLabel}.`,
+		`Rationale: ${rationale}`,
+		tradeoffs ? `Tradeoffs: ${tradeoffs}` : "",
+	]
+		.filter(Boolean)
+		.join(" ");
+}