Add \guild_id\ input to update-archive action

Guild ID is required for \`archive.py\` since the default was removed
during genericization. Callers must pass their guild ID explicitly.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: ryan-williams

actions/update-archive/action.yml

@@ -2,6 +2,9 @@ name: Update Discord Archive
 description: Fetch new messages, rebuild DB, sync to D1, push to DVX remote
 
 inputs:
+  guild_id:
+    description: Discord guild (server) ID
+    required: true
   discord_token:
     description: Discord bot token
     required: true
@@ -49,10 +52,11 @@ runs:
       shell: bash
 
     # Fetch new messages
-    - run: uv run .discord-agent/archive.py
+    - run: uv run .discord-agent/archive.py -g "$DISCORD_GUILD"
       shell: bash
       env:
         DISCORD_TOKEN: ${{ inputs.discord_token }}
+        DISCORD_GUILD: ${{ inputs.guild_id }}
 
     # Rebuild SQLite
     - run: uv run .discord-agent/build_db.py