refactor(tests): merge detect_suggested_procedure into expected_detection

Two overlapping TestTemplate fields (expected_detection: narrative
guidance from imports/leads; detect_suggested_procedure: concrete
commands from approved suggestions) are now one. Blue-side procedure
suggestions target expected_detection directly, appending onto
whatever is already there rather than overwriting it — same
merge-not-overwrite behavior already used for the red side. Existing
detect_suggested_procedure data is folded into expected_detection
before the column is dropped.

backend/app/models/test_template.py

@@ -41,13 +41,12 @@ class TestTemplate(Base):
     source_url = Column(String, nullable=True)
     # Assign attack_procedure = Column(Text, nullable=True)               # Suggested attack procedure
     attack_procedure = Column(Text, nullable=True)               # Suggested attack procedure
-    # Assign expected_detection = Column(Text, nullable=True)             # What blue team should detect
-    expected_detection = Column(Text, nullable=True)             # What blue team should detect
-    # Suggested detection procedure — Blue's counterpart to attack_procedure.
-    # Only ever filled in via an approved procedure suggestion or a lead
-    # editing the template directly; external syncs never touch it (those
-    # only insert brand-new rows, never update existing ones).
-    detect_suggested_procedure = Column(Text, nullable=True)
+    # What blue team should detect — narrative guidance from imports/leads,
+    # plus concrete commands appended via approved procedure suggestions
+    # (Blue's counterpart to attack_procedure). External syncs never touch
+    # an existing row (they only insert brand-new ones), so anything added
+    # here is safe across re-syncs.
+    expected_detection = Column(Text, nullable=True)
     # Assign platform = Column(String, nullable=True)                     # windows / linux...
     platform = Column(String, nullable=True)                     # windows / linux / macos
     # Assign tool_suggested = Column(String, nullable=True)