docs: add opencode-zellij-indicator to plugins (#185)

Co-authored-by: Aidan Gallagher <[email protected]>

data/plugins/opencode-zellij-indicator.yaml

@@ -0,0 +1,10 @@
+name: OpenCode Zellij Indicator
+repo: https://github.com/aidan-gallagher/opencode-zellij-indicator
+tagline: Show each OpenCode session's status and title on its Zellij tab
+description: Puts a status icon (working, needs-you, done-unseen, done-seen) and the session title on each Zellij tab, so you can see at a glance which of your parallel OpenCode agents is busy, blocked on a prompt, or finished — without switching tabs. Includes an optional stopwatch and sound notifications.
+tags:
+  - zellij
+  - terminal
+  - status
+  - notifications
+  - tabs