fluers-runtime

The harness layer — Flue's own contribution on top of the agent core.

This is where the bulk of a faithful port lives:

• [agent] — define_agent / AgentProfile (model + tools + skills + sandbox + instructions), mirroring @flue/runtime's defineAgent.
• env — the SessionEnv trait: the filesystem + process abstraction that every sandbox backend implements.
• [sandbox] — virtual / local / remote sandbox backends.
• [session] — session management, event store, dispatch/invoke.
• [runner] — session-aware coordination and persistence after each turn.
• [skill] — SKILL.md parsing and packaged-skill directories.
• [tool] — the built-in tools: read, write, edit, bash, grep, glob (with Flue's byte/line limits).
• [event] — the event stream observers subscribe to.