Removes the @deprecated send() function (was at src/ai_client.py:2939-3000)
and the from typing_extensions import deprecated import (line 38). The
function is replaced by send_result() which has been the canonical public
API since the data_oriented_error_handling_20260606 track (commit 9f86b2be).
All 3 production call sites (src/conductor_tech_lead.py:68,
src/orchestrator_pm.py:86, src/multi_agent_conductor.py:591) and 18 test
files were migrated in Phases 1-2; 4 pre-existing failures were fixed in
Phases 3-4. No remaining callers of ai_client.send(.
Verification:
- uv run rg 'def send\\(' src/ai_client.py returns 0 hits
- import src.ai_client; hasattr(ai, 'send') is False
- 73/73 migrated tests pass
ed
8c81b727d6