Implement the agent loop plugin
@deepseek-ai/dsh-agent-loop: LoopAgent (inbox with queued + steering
FIFOs, per-step AbortController) and the streaming-first
session/turn/step loop. Extension seams: agent/request,
agent/step-result, agent/turn-continuation waterfalls; raw chunks
logged for replay while BlockAssembler builds the assembled message;
steering drains between steps; session/flush awaited at turn end.
16 tests with a scripted mock adapter cover turn lifecycle ordering,
tool round-trips, steering, inject(), continuation override/veto,
mid-stream abort, queued turn chaining, replay equivalence, and
mid-turn fiber disposal (HMR safety).
Tianyi Cui
43f4258277