docs: add summary of musiclink integration for team

docs/musiclink-integration-summary.md

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+# MusicLink Deployment Summary
+
+We have successfully integrated the `MusicLink` bot into the `ops-jrz1` production environment.
+
+## Architecture
+
+We deployed `MusicLink` using a **Matrix-mediated** architecture to bypass Matterbridge's lack of support for Slack Socket Mode (which our App configuration requires).
+
+**Flow:**
+`Slack User` -> `#music` -> `mautrix-slack` -> `Matrix Room` -> `Matterbridge` -> `MusicLink`
+
+## Integration Details
+
+1.  **No Code Changes:** We used the `musiclink` repository as-is (via Nix Flake input). All deployment logic resides in our infrastructure repo (`ops-jrz1`).
+2.  **Service Isolation:** The bot runs as a systemd service (`musiclink.service`) with `DynamicUser` and restricted permissions.
+3.  **Connectivity:**
+    - We run a bundled `Matterbridge` instance (`musiclink-matterbridge.service`) configured to connect to our Matrix homeserver.
+    - `MusicLink` connects to this local Matterbridge via WebSocket (`ws://127.0.0.1:4242`).
+    - We granted the bot's Matrix user (`@musiclink:clarun.xyz`) server admin privileges to allow it to join the invite-only portal rooms bridging Slack.
+
+## Status
+
+- **Active:** The bot is running and monitoring the bot testing room (`!whU7Geg7JPrBL5wHcW:clarun.xyz`).
+- **Verified:** We confirmed bidirectional communication by having the bot post a test message (GIF) to the room.
+- **Next Steps:** We will enable it for the main `#music` channel once we confirm link conversion logic in the testing room.