feat(tests): auto-propose procedure suggestions from submitted rounds, add lead review workflow

When Red or Blue submits a round for a test created from a template,
any extractable command in their procedure text is proposed as an
update to the template's suggested procedure — never written
automatically. Adds GET/approve/reject endpoints scoped so a lead only
reviews their own team's suggestions; approving writes the suggested
text into the template, rejecting leaves it untouched.

backend/app/schemas/procedure_suggestion.py

@@ -0,0 +1,28 @@
+"""Pydantic schemas for procedure-suggestion review endpoints."""
+
+import uuid
+from datetime import datetime
+
+from pydantic import BaseModel, ConfigDict
+
+
+class ProcedureSuggestionOut(BaseModel):
+    """A proposed template procedure update, pending or reviewed."""
+
+    id: uuid.UUID
+    template_id: uuid.UUID
+    team: str
+    suggested_text: str
+    source_test_id: uuid.UUID | None = None
+    submitted_by: uuid.UUID | None = None
+    status: str
+    reviewed_by: uuid.UUID | None = None
+    reviewed_at: datetime | None = None
+    created_at: datetime | None = None
+
+    # Populated for display — the template name and its current suggested
+    # value, so a lead can compare without a second lookup.
+    template_name: str | None = None
+    template_current_text: str | None = None
+
+    model_config = ConfigDict(from_attributes=True)