Prompt dumps no longer rewrite an agent's starting data, and reset clears them

Prompt dumping is a debugging feature that writes out what Claude Code sends to the model, tracked separately for each agent (a separate Claude instance handling part of a task). Two things are different:

• Once an agent's starting data has been written, Claude Code now marks it as done. A later dump for the same agent does not write that starting data again.
• The reset step now clears the prompt-dump state. Before, it cleared request replay chains instead.