* fix: broaden session ID validator to support new hermes-agent format
* test: add more path traversal evil IDs to session validator test
Add null byte, backslash, forward slash, and dot-extension variants
to the rejected session ID test to cover additional attack vectors.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Co-authored-by: Nathan Esquenazi <nesquena@gmail.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>