feat: add multi-agent routing with declarative bindings
Implement per-agent workspace/model/session isolation with 7-level
priority routing cascade (peer > parent_peer > guild > team > account >
channel > default). Backward compatible - empty agents.list creates
implicit "main" agent from defaults.
Core components:
- routing/agent_id.go: ID normalization with pre-compiled regex
- routing/session_key.go: 4 DM scope modes with identity links
- routing/route.go: RouteResolver with priority-based binding matcher
- agent/instance.go: Per-agent state (workspace, sessions, tools, model)
- agent/registry.go: Agent lifecycle, route resolution, subagent ACL
Integration:
- config.go: AgentModelConfig (flexible JSON), bindings, session config
- loop.go: Complete rewrite for multi-agent dispatch
- Channel adapters: peer_kind/peer_id metadata (telegram, discord, slack)
- spawn.go: Subagent allowlist enforcement per agent
Validated end-to-end with Discord channel-based bindings, default
fallback routing, and per-agent session persistence.
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