feat: add Hermes Agent support — configs, plugin, README

[tayuLuc]

What / Why / How

Adds Hermes Agent support to context-mode — the first upstream integration for this platform.

What: Configuration files, plugin, and README updates to support context-mode on Hermes Agent.

Why: Hermes Agent is an open-source AI agent framework by Nous Research with 130k+ GitHub stars, running across CLI, Telegram, Discord, and other platforms. It natively supports MCP servers and has a Python plugin system — making it a natural fit for context-mode.

How:

• configs/hermes/AGENTS.md — routing rules for Hermes (same pattern as OpenClaw/OpenCode configs)
• plugins/context-saver/ — Hermes Agent plugin with pre_tool_call and pre_llm_call hooks that enforce context-mode routing
• README updates — Hermes added to the platform table and install section

No dependency on context-mode's npm package — the plugin uses Hermes' native execute_code as the sandbox, making it zero-dependency.

Affected platforms

• Claude Code
• Cursor
• VS Code Copilot (GitHub Copilot)
• JetBrains Copilot
• Gemini CLI
• Qwen Code
• OpenCode
• KiloCode
• Codex CLI
• OpenClaw (Pi Agent)
• Pi
• Kiro
• Antigravity
• Zed
• Hermes Agent (new)
• All platforms

Test plan

1. Install context-mode as MCP server: hermes mcp add context-mode -- npx -y context-mode
2. Copy plugin to ~/.hermes/plugins/context-saver/
3. Enable in config: plugins.enabled: [context-saver]
4. Restart: hermes gateway restart
5. Verify pre_tool_call blocks curl — model redirects to ctx_execute
6. Verify ctx stats / ctx doctor utility commands work via MCP

Checklist

• Tests added/updated (TDD: red → green)
• npm test passes (no JS/TS changes — Python plugin only)
• npm run typecheck passes
• Docs updated if needed (README, platform-support.md)
• No Windows path regressions (forward slashes only)
• Targets next branch (unless hotfix)

Cross-platform notes

The plugin is pure Python 3.9+ — no native dependencies. Hermes Agent runs on macOS, Linux, and Windows (WSL).

[mksglu]

Why is it py?

[tayuLuc]

Why is it py?

It's dictated by the Hermes runtime.

Hermes Agent is a Python-based application, and its plugin system (pre_tool_call, pre_llm_call, etc.) is designed to be Python modules loaded directly into its execution environment. The official Hermes documentation for building plugins exclusively uses the __init__.py + plugin.yaml Python pattern.

To hook into the agent's tool selection process (e.g., intercepting a curl call before it happens and telling the model to use ctx_execute instead), the hook must run in the Hermes Python process.

This is analogous to the existing plugins in this repo: Cursor's .claude-plugin/ and OpenClaw's .openclaw-plugin/ are written in JavaScript/TypeScript because they run in the Node.js / VS Code environments. .hermes-plugin/ is Python because it runs in the Hermes Python runtime.