Initial agent-news: Dart Telegram bot + Claude Code runner + MCP bridge

/news spawns claude-code as a local subprocess (single pod, no cross-container
exec on K3s); Claude delivers the digest itself via the send_to_telegram MCP tool.

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

.dockerignore

@@ -0,0 +1,5 @@
+.git
+bot/.dart_tool
+bot/build
+mcp_server/.dart_tool
+mcp_server/build