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Drop the quantum state from shot checkpoints by default (#176)

Shot checkpoints no longer hold the quantum state unless the user
keeps it, so a dense statevector stops dominating their size (#164).

- A QuantumProgram built without a History marks "state" as not
  serialized in its shots' frames; its initial frames still save whole.
- Composite instructions reserve "state", so the live state is no
  longer copied into every stack label they push.
- Passing a History keeps the state as before; a checkpointed run that
  keeps it warns, and a dropped initial state raises ValueError.
- A program read back keeps its frames' own serialization marks, so it
  still runs after repeated saves.
- Minor: tests of dropped, kept and saved states; docstrings; workflow
  docs on what a checkpoint keeps; CHANGELOG entries.

Co-authored-by: claude-sonnet-5-5 <noreply@anthropic.com>

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