fix(orchestrator): scope the answer contract to orchestrator agents

[shoto290]

Summary

• Stop the answer-format rules from being injected into every session, so only the orchestrator assistants are held to them.
• Ship those rules with the project assistant that onboarding creates, so a newly onboarded project gets them without extra setup.
• Add an automatic check that catches the two copies of the rules drifting apart.

Changes

flowchart LR
  subgraph P["plugins/orchestrator/"]
    H["- hooks/hooks.json"]
    O["~ skills/onboard/"]
  end
  subgraph C[".claude/"]
    S["+ hooks/response-style-card.sh"]
    A["~ agents/shoto-orchestrator.md"]
  end
  H -.->|"replaced by"| A
  O -->|"installs"| S
  A -->|"fires"| S
  CHK["~ scripts/check-repo.sh"] --> S

  classDef add fill:#166534,stroke:#22c55e,color:#fff
  classDef chg fill:#854d0e,stroke:#eab308,color:#fff
  classDef del fill:#450a0a,stroke:#991b1b,color:#d4d4d4
  class S add
  class A,O,CHK chg
  class H del

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