feat(agents): consolidate connectors under mcp_discovery; route web search through google_search

MCP consolidation:
- Route all MCP-capable connectors (Slack, Jira, Linear, ClickUp, Airtable,
  Notion, Confluence, interim Gmail/Calendar, custom MCP) through a single
  `mcp_discovery` subagent. Drive/OneDrive/Dropbox stay native to enrich the KB.
- Deprecate Discord/Teams/Luma: no viable official MCP server.

Google-only web search:
- Remove the main-agent `web_search` tool and the SearXNG platform service;
  all public web search now flows through the `google_search` subagent via task().
- Deprecate the Tavily/SearXNG/Linkup/Baidu search connectors (HTTP 410 on
  create, "Deprecated" badge); guide heavy users to the custom MCP connector.
- Remove web search from anonymous chat (pure Q&A).
- Tear SearXNG out of docker compose + install scripts; drop tavily-python
  and linkup-sdk deps and their config/env vars.

Fix:
- metrics._package_version() now swallows any metadata lookup failure. A
  malformed editable-install distribution with no `Version` field raised
  KeyError deep in importlib.metadata, and since it runs on every
  record_subagent_invoke_duration call it was crashing every task()
  delegation. Verified end-to-end against live GPT-5.4.

Co-authored-by: Cursor <cursoragent@cursor.com>

surfsense_web/features/chat-messages/timeline/subagent-rename.ts

@@ -4,6 +4,15 @@ function asNonEmptyString(v: unknown): string | undefined {
 	return typeof v === "string" && v.trim().length > 0 ? v.trim() : undefined;
 }
 
+/**
+ * Explicit display labels for subagents whose title-cased id reads poorly.
+ * Legacy per-connector names (gmail, slack, ...) intentionally fall through
+ * to {@link titleCaseSubagent} so historical conversations keep their labels.
+ */
+const SUBAGENT_DISPLAY_LABELS: Record<string, string> = {
+	mcp_discovery: "Connected Apps",
+};
+
 /**
  * Title-case a subagent identifier:
  *   "notion"        → "Notion"
@@ -27,7 +36,8 @@ export function titleCaseSubagent(raw: string): string {
 export function resolveSubagentTitle(item: ToolCallItem): string | undefined {
 	if (item.toolName !== "task") return undefined;
 	const subagent = asNonEmptyString(item.args?.subagent_type);
-	return subagent ? titleCaseSubagent(subagent) : undefined;
+	if (!subagent) return undefined;
+	return SUBAGENT_DISPLAY_LABELS[subagent] ?? titleCaseSubagent(subagent);
 }
 
 /**

surfsense_web/features/chat-messages/timeline/tool-registry/registry.ts

@@ -165,10 +165,9 @@ const DeleteConfluencePageToolUI = dynamic(
  *  - **Structural primitives** (``task``): the row IS the parent of a
  *    delegation span; its job is to label the group. Children render
  *    as their own indented entries.
- *  - **Suppressed connectors** (``web_search``, ``link_preview``,
- *    ``multi_link_preview``, ``scrape_webpage``): citations they
- *    produce render inline in markdown; a separate card would be
- *    redundant noise.
+ *  - **Suppressed connectors** (``link_preview``, ``multi_link_preview``,
+ *    ``scrape_webpage``): citations they produce render inline in
+ *    markdown; a separate card would be redundant noise.
  */
 const NullTimelineBody: TimelineToolComponent = () => null;
 
@@ -218,7 +217,6 @@ const TOOLS_BY_NAME = {
 	create_confluence_page: CreateConfluencePageToolUI,
 	update_confluence_page: UpdateConfluencePageToolUI,
 	delete_confluence_page: DeleteConfluencePageToolUI,
-	web_search: NullTimelineBody,
 	link_preview: NullTimelineBody,
 	multi_link_preview: NullTimelineBody,
 	scrape_webpage: NullTimelineBody,