Scope down to local Docker testing, drop Gitea/K3s plumbing for now

This is a pilot project — running it via docker compose locally is enough
for now. Deploy/CI can come back once the project is greenlit for real use.

Also fixes claude invocation: add --strict-mcp-config (verified against
the actual installed claude-code CLI --help) so only agent-news' own MCP
server is loaded, not whatever else might be discoverable in the environment.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

bot/lib/claude_runner.dart

@@ -41,6 +41,7 @@ class ClaudeRunner {
           prompt,
           '--mcp-config',
           config.mcpConfigPath,
+          '--strict-mcp-config',
           '--dangerously-skip-permissions',
         ],
         environment: {'TELEGRAM_BOT_TOKEN': config.telegramToken},