Introduces TaskPlanner and AgentSpec so Pyra can decompose multi-step
tasks into sequential steps, each executed with a focused sub-agent
context rather than the full conversation history.
- plugins/base.py: AgentSpec dataclass + agent_spec() on Protocol/BasePlugin
- plugins/registry.py: register_builtin, get_agent, list_agents
- chat/planner.py: TaskPlanner with plan approval, per-step tool-use loop,
verification call, and agent-aware routing
- chat/session.py: wires plan_and_execute as a built-in tool after load_all
- chat/history.py: planning hint in system prompt + dynamic agents listing
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
curo1305