Add a reusable Go agent package (server/pkg/agent/) that provides a
unified Backend interface for executing prompts via either Claude Code
or Codex. The daemon now auto-detects which CLIs are available at
startup, registers a runtime for each, and routes tasks to the correct
backend based on task.Context.Runtime.Provider.
Key changes:
- server/pkg/agent/agent.go: Backend interface, Message/Result types, factory
- server/pkg/agent/claude.go: Spawns claude CLI with stream-json, parses output
- server/pkg/agent/codex.go: Spawns codex app-server, JSON-RPC 2.0 protocol
- server/cmd/daemon/daemon.go: Multi-runtime registration, round-robin polling,
provider-based backend selection. Removes old runCodexExec/codexResultSchema.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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