feat(tasks): adopt canonical task statuses

api/services/reconciliation.py

@@ -5,6 +5,7 @@ from enum import Enum
 from typing import Any
 
 from api.services.lifecycle import status_value
+from api.task_status import CANONICAL_TASK_STATUSES
 from api.workplan_status import CLOSED_WORKSTREAM_STATUSES, normalize_workstream_status
 
 
@@ -22,7 +23,7 @@ class StateChangeClassification:
 
 
 WRITE_THROUGH_WORKSTREAM_STATUSES = {"proposed", "ready", "active", "backlog"}
-TASK_STATUSES = {"todo", "in_progress", "blocked", "done", "cancelled"}
+TASK_STATUSES = set(CANONICAL_TASK_STATUSES)
 
 
 def classify_workstream_status_change(
@@ -129,11 +130,11 @@ def classify_task_status_change(
             "status is unchanged",
             "no file update required",
         )
-    if target == "blocked" and not (blocking_reason or "").strip():
+    if target == "wait" and not (blocking_reason or "").strip():
         return StateChangeClassification(
             ReconciliationClass.HUMAN_CONFIRMATION,
-            "blocked tasks require a blocking reason",
-            "capture the blocker before writing status",
+            "waiting tasks should explain the wait condition",
+            "capture the wait reason before writing status",
         )
     if target in TASK_STATUSES:
         return StateChangeClassification(