Add `hermes` as an install target (Nous Research Hermes Agent)

[eikiyo]

Is your feature request related to a problem? Please describe.

cq currently installs into 7 hosts (claude, codex, copilot, cursor,
devin-desktop, opencode, pi). Hermes Agent (Nous Research) has become one
of the most widely used open-source harnesses, but there's no
--target hermes, so Hermes users can't join the commons without manual
wiring.

Describe the solution you'd like

Add a TargetHermes adapter in cli/internal/install/, mirroring
opencode.go:

• write the shared SKILL.md into Hermes's skills directory
• add the cq MCP server entry to ~/.hermes/config.yaml under
  mcp_servers (Hermes auto-discovers and registers MCP tools from
  config, so no host-side code is needed)
• install the reflect / status command files
• upsert the instruction block into the context file Hermes reads

Scope looks comparable to the existing adapters (~150-200 LOC + tests).
The registry comment says adding an entry extends ValidTarget /
AllowedTargets / SelectHosts, so this should be self-contained.

One design question: cq's auto-query-on-error hooks are Claude-Code
specific. Hermes handles hooks via its Python plugin system, so parity
there would live in a separate Hermes plugin rather than in this repo.
Fine to treat that as out of scope here?

Describe alternatives you've considered

• Manual wiring: users hand-edit ~/.hermes/config.yaml and copy
  SKILL.md themselves. Works, but no dry-run, no uninstall, no parity
  with the one-command install other hosts get.
• A Hermes-side plugin wrapping the cq CLI without upstream support.
  Possible, but discovery suffers and install UX fragments across hosts.

Additional Context

Hermes MCP auto-discovery: https://hermes-agent.nousresearch.com/docs/user-guide/features/mcp
Happy to build and PR this myself if maintainers are open to it.

Self-Checklist

• I have read the Contributing Guidelines.
• I have searched the existing issues and found no duplicate.
• I have provided a clear and concise description of the problem.
• I have provided a clear and concise description of the proposed solution.

[eikiyo]

Happy to build and PR this myself if maintainers are open to it.