fix: Zulip attachment handling — event attachments + all file types

hermes-zulip-plugin (Tanko/Mumuni):
  - Add _extract_event_attachments() to handle message.attachments from
    Zulip UI file uploads (previously only inline markdown links worked)
  - Add shared _cache_attachment() method for images/audio/documents
  - Refactor _extract_inline_media() to use _cache_attachment()
  - Fix connect() signature for hermes-agent 0.18.0 compat (add is_reconnect)

pi-zulip-extension (Abiba):
  - Extend attachment handling beyond images only: text files (decoded
    inline), PDFs (pdftotext extraction), binary files (metadata)
  - 50K char cap on text/PDF extraction to prevent context flooding
  - Classify attachments by extension (image/text/pdf/binary)

pi-mcp-extension (Abiba):
  - Detect bridge-side text truncation (… ellipsis marker)
  - Rebuild relay message display from structuredContent when truncated
  - Add rebuildRelayTextFromStructuredContent() helper

Config:
  - Add ZULIP_ROLE=router to ecosystem.abiba.config.cjs (was missing)

pi-zulip-extension/config/ecosystem.abiba.config.cjs

@@ -0,0 +1,26 @@
+module.exports = {
+  apps: [
+    {
+      name: "abiba-zulip",
+      script: "/usr/bin/pi",
+      args: "--mode rpc --session-id zulip-service",
+      cwd: "/root",
+      env: {
+        ZULIP_ROLE: "router",
+        ZULIP_EXTENSION_ACTIVE: "true",
+        NODE_OPTIONS: "--max-old-space-size=512",
+      },
+      // Prevent rapid crash-looping: restart with backoff, limit retries
+      min_uptime: "30s",
+      max_restarts: 15,
+      restart_delay: 10000,
+      kill_timeout: 5000,
+      autorestart: true,
+    },
+    {
+      name: "abiba-telegram",
+      script: "/usr/bin/pitg",
+      cwd: "/root",
+    },
+  ],
+};