Add validation in Manager.AddRig() to reject rig names containing
characters that break agent ID parsing. Agent IDs use format
<prefix>-<rig>-<role>[-<name>] with hyphens as delimiters, so
hyphenated rig names like op-baby cause parsing failures.
The validation rejects hyphens, dots, and spaces, and suggests a
sanitized alternative in the error message.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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