feat(ai): web-research pre-step + auto-kontext + save_news_article tool

Mission objectives matching /recherch|research|news|finde|suche|aktuelle|neueste/i
trigger a synchronous deep-research call (mana-search + mana-llm via the
existing /api/v1/research/start-sync pipeline) before the planner runs;
the summary plus top-8 source URLs are injected as a synthetic ResolvedInput
so the planner can stage save_news_article proposals against real URLs.

The kontext singleton is auto-attached to every mission's planner input
(decrypted client-side, gated on non-empty content + not already linked).

save_news_article is a new proposable tool routed through articlesStore
.saveFromUrl (Readability via /api/v1/news/extract/save). AiProposalInbox
mounted on /news so the user can approve/reject inline. mana-ai planner
tool list mirrors the new tool to keep the boot-time drift guard happy.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

services/mana-ai/src/planner/tools.ts

@@ -83,6 +83,27 @@ export const AI_AVAILABLE_TOOLS: readonly AvailableTool[] = [
 		description: 'Macht den letzten Drink-Eintrag rückgängig',
 		parameters: [],
 	},
+	{
+		name: 'save_news_article',
+		module: 'news',
+		description:
+			'Speichert einen Artikel von einer URL in die Leseliste. URL wird serverseitig per Readability extrahiert.',
+		parameters: [
+			{ name: 'url', type: 'string', description: 'Die Artikel-URL', required: true },
+			{
+				name: 'title',
+				type: 'string',
+				description: 'Anzeigetitel für den Approval-Dialog (informativ)',
+				required: false,
+			},
+			{
+				name: 'summary',
+				type: 'string',
+				description: 'Kurze Begründung warum dieser Artikel relevant ist',
+				required: false,
+			},
+		],
+	},
 ];
 
 export const AI_AVAILABLE_TOOL_NAMES = new Set<string>(AI_AVAILABLE_TOOLS.map((t) => t.name));