AgentSuiteLocal v0.8.6

Sprint 2 close-out — regression-guard tests for progress_callback wire-up; fix step key collision in pipeline SSE events.

Added

• test_execute_run_emits_progress_events: regression guard that turns red if progress_callback=progress_callback is removed from agent.run() in _execute_run. Uses side_effect to invoke the callback synchronously from the executor thread; await asyncio.sleep(0) flushes the call_soon_threadsafe queue before asserting on run["events"].
• test_execute_pipeline_step_emits_progress_events: same guard for the _execute_pipeline_step path. Asserts ≥1 stage_update event in pipeline["events"] and that step carries the pipeline step index (not the AgentSuite internal stage step).
• Issue #19 filed: migrate _execute_pipeline_step to PipelineOrchestrator to enable K1 cross-stage context accumulation (currently bypassed; each pipeline step runs as an isolated single-agent call).

Fixed

• step key collision in pipeline progress_callback: stage_progress events emitted by BaseAgent.run() include a "step" field (intra-stage step counter). Forwarding the full dict while also passing step=step_idx to _emit_pipeline caused TypeError: got multiple values for keyword argument 'step' at runtime, silently swallowing all pipeline stage_update events. Now strips "step" from the forwarded payload; step=step_idx (pipeline step index) is authoritative.

Test metrics (v0.8.6)

• Backend tests: 135 passing (was 127 in v0.8.5; +8 net including 2 new progress-event guards)
• execution.py coverage: 72% (was 70% against v0.8.5 tests; +2pp, covers progress_callback closure bodies)
• Repo-wide coverage: 67% (floor 60%)