fix(ci): remove prompt from @claude action to enable tag mode

The action's mode detector routes to agent mode (no comment posting)
when a prompt is set. Move issue routing guidance to a rules file in
the claude config repo so the action uses tag mode and posts responses.

Author: otavio

.github/workflows/claude.yml

@@ -118,8 +118,3 @@ jobs:
           claude_code_oauth_token: ${{ secrets.CLAUDE_CODE_OAUTH_TOKEN }}
           github_token: ${{ secrets.GITHUB_TOKEN }}
           trigger_phrase: "@claude"
-          show_full_output: true
-          prompt: |
-            When asked to create a GitHub issue, route it to the correct repository:
-            - Community or open-source ShellHub issues → shellhub-io/shellhub (this repo)
-            - Cloud or enterprise-specific issues → shellhub-io/team