perf: build case-issue map once in stale-case-reminder; add idempotency TODO

- Hoist issues.list() loop outside stale-cases loop — reduces RPCs from
  O(cases × companies × issues) to O(companies × issues)
- Add TODO comment for requestId-based idempotency guard in onWebhook

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/worker.ts

@@ -722,34 +722,35 @@ const plugin = definePlugin({
 				total: number;
 			};
 
-			let reminded = 0;
+			// Build case→issue map once (O(companies × issues)) to avoid N×M RPCs per stale case
 			const companies = await ctx.companies.list();
-			for (const staleCase of data.cases) {
+			const caseIssueMap = new Map<string, { issueId: string; companyId: string }>();
 			for (const company of companies) {
 				const issues = await ctx.issues.list({ companyId: company.id });
-					let linkedIssueId: string | null = null;
 				for (const issue of issues) {
 					const linkedCase = await ctx.state.get({
 						scopeKind: "issue",
 						scopeId: issue.id,
 						stateKey: "legal-case-number",
 					});
-						if (linkedCase === staleCase.case_number) {
-							linkedIssueId = issue.id;
-							break;
+					if (linkedCase && typeof linkedCase === "string") {
+						caseIssueMap.set(linkedCase, { issueId: issue.id, companyId: company.id });
 					}
 				}
-					if (!linkedIssueId) continue;
+			}
+
+			let reminded = 0;
+			for (const staleCase of data.cases) {
+				const linked = caseIssueMap.get(staleCase.case_number);
+				if (!linked) continue;
 
 				await ctx.issues.createComment(
-						linkedIssueId,
+					linked.issueId,
 					`⚠️ **תיק תקוע ${staleCase.case_number}** — ${staleCase.days_stale} ימים ללא עדכון (סטטוס: ${staleCase.status}). האם נדרשת פעולה?`,
-						company.id,
+					linked.companyId,
 				);
 				reminded++;
 				ctx.logger.info(`stale-case-reminder: reminded case ${staleCase.case_number} (${staleCase.days_stale}d)`);
-					break; // Found the company, move to next case
-				}
 			}
 
 			ctx.logger.info(`stale-case-reminder: done. ${reminded}/${data.total} cases reminded`);
@@ -801,6 +802,9 @@ const plugin = definePlugin({
 	async onWebhook(input: PluginWebhookInput): Promise<void> {
 		if (!pluginCtx) return; // not yet initialized
 
+		// TODO: add idempotency guard using input.requestId to prevent duplicate
+		// comments on rapid retries (store requestId in plugin state with ~60s TTL)
+
 		const { endpointKey, parsedBody } = input;
 
 		if (endpointKey !== "case-status") return;