feat: add Hermes Agent plugin integration

[jamieosh]

Summary

• add a new hermes/ integration folder with a Hermes pre_tool_call plugin for RTK command rewriting
• document Hermes installation and configuration in hermes/README.md
• update the main README supported-tools section to include Hermes Agent

Details

This adds a Hermes-specific adaptation of the existing RTK integration pattern. The plugin is intentionally thin and delegates rewrite decisions to rtk rewrite.

Hermes-specific behavior included in this first pass:

• RTK version guard (>= 0.23.0)
• safe fallback if RTK is missing, too old, errors, or times out
• conservative skip rules for compound commands, background terminal calls, and PTY terminal calls
• env-based config and in-memory caching

Caveat

Hermes pre_tool_call can mutate tool arguments, but it does not currently provide a clean native way for this plugin to trigger an interactive confirmation prompt. Because of that, RTK exit code 3 (ask) is handled conservatively by leaving the original command unchanged.

[CLAassistant]

All committers have signed the CLA.