fix: notify WG Slack channel when committee document is added (#1552)

When a working group leader adds a committee document, post a
notification to the WG's Slack channel so members can track updates.
This was missing — only published posts triggered channel notifications.

Includes isSlackConfigured() guard, APP_URL support, and mrkdwn
sanitization for title in link syntax.

Resolves Addie escalation #123 (Pia/Creative WG).

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: bokelley

.changeset/wg-document-slack-notify.md

@@ -0,0 +1,4 @@
+---
+---
+
+Notify working group Slack channels when a committee document is added by a WG leader. Previously only published posts triggered Slack notifications; documents were silently added without channel visibility.

server/src/routes/committees.ts

@@ -19,7 +19,7 @@ import { notifyPublishedPost } from "../notifications/slack.js";
 import { notifyUser } from "../notifications/notification-service.js";
 import { decodeHtmlEntities } from "../utils/html-entities.js";
 import { reindexDocument } from "../addie/jobs/committee-document-indexer.js";
-import { createChannel, setChannelPurpose } from "../slack/client.js";
+import { createChannel, setChannelPurpose, sendChannelMessage, isSlackConfigured } from "../slack/client.js";
 import { CommunityDatabase } from "../db/community-db.js";
 
 const logger = createLogger("committee-routes");
@@ -1656,6 +1656,48 @@ export function createCommitteeRouters(): {
 
       logger.info({ documentId: document.id, groupSlug: slug, userId: user.id }, 'Committee document created');
 
+      // Notify the working group's Slack channel
+      if (group.slack_channel_id && isSlackConfigured()) {
+        const docTypeLabel = document_type === 'spreadsheet' ? 'Spreadsheet' : document_type === 'presentation' ? 'Presentation' : 'Document';
+        const userName = user.firstName && user.lastName
+          ? `${user.firstName} ${user.lastName}`
+          : user.email || 'A working group leader';
+        const appUrl = process.env.APP_URL || 'https://agenticadvertising.org';
+        const groupUrl = `${appUrl}/working-groups/${slug}`;
+        // Sanitize for Slack mrkdwn link syntax (pipe breaks <url|label>)
+        const safeTitle = title.replace(/[|<>]/g, '-');
+
+        sendChannelMessage(group.slack_channel_id, {
+          text: `📄 New ${docTypeLabel} added to ${group.name}: ${title}`,
+          blocks: [
+            {
+              type: 'header',
+              text: {
+                type: 'plain_text' as const,
+                text: `📄 New ${docTypeLabel} Added`,
+                emoji: true,
+              },
+            },
+            {
+              type: 'section',
+              text: {
+                type: 'mrkdwn' as const,
+                text: `*<${document_url}|${safeTitle}>*${description ? `\n${description}` : ''}`,
+              },
+            },
+            {
+              type: 'section',
+              text: {
+                type: 'mrkdwn' as const,
+                text: `Added by ${userName} · <${groupUrl}|View all ${group.name} resources>`,
+              },
+            },
+          ],
+        }).catch(err => {
+          logger.warn({ err, groupSlug: slug, documentId: document.id }, 'Failed to send Slack notification for new committee document');
+        });
+      }
+
       res.status(201).json({ document });
     } catch (error) {
       logger.error({ err: error }, 'Create committee document error');