chore(agent): update default model and containerize obscura MCP server

agent/config.yml

@@ -6,7 +6,6 @@ setupVersion: 2
 hideThinkingBlock: false
 modelRoles:
   plan: anthropic/claude-fable-5-1:high
-  default: anthropic/claude-opus-5-5:high
   smol: anthropic/claude-haiku-5-5
   task: anthropic/claude-sonnet-5-5
   web: web/exa
@@ -20,6 +19,8 @@ modelRoles:
   tiny: opencode-go/step-5-preview:auto
   memory: opencode-go/gemini-4-argon-contributor:medium
   judge: anthropic/claude-fable-5-1:max
+  default: anthropic/claude-opus-5-5:medium
+  PM: anthropic/claude-sonnet-5-5
 composer:
   shape: rule
 modelPresets: