fix(speculation): reject ranking fields on content scorers

## Summary

### Why?

A factors map or nested base under heuristic/composite used to load and then be ignored, so a misplaced pathPassed looked configured while ranking stayed at 1.

### What?

Fail those configs in normalizeContent, including composite components and a queue overlay base.

## Test Plan

✅ `go test ./service/submitqueue/orchestrator/server/ -run TestLoadProfilesConfig_RejectsBadScorers`

Author: behinddwalls

service/submitqueue/orchestrator/server/config.go

@@ -616,6 +616,9 @@ func validateFactors(where string, factors map[string]float64) error {
 }
 
 func (s *scorerConfig) normalizeContent(where string) error {
+	if len(s.Factors) > 0 || s.Base != nil {
+		return fmt.Errorf("%s: factors and base belong on the ranking scorer, not under base", where)
+	}
 	if s.Type == "" {
 		s.Type = scorerTypeHeuristic
 	}

service/submitqueue/orchestrator/server/config_test.go

@@ -667,6 +667,10 @@ func TestLoadProfilesConfig_RejectsBadScorers(t *testing.T) {
 		{name: "unknown combine", contents: "defaults:\n  scorer:\n    base:\n      type: composite\n      combine: median\n      components: {a: {type: heuristic}}\n"},
 		{name: "score out of range", contents: "defaults:\n  scorer:\n    base:\n      type: heuristic\n      buckets: [{min: 0, max: 10, score: 2.0}]\n"},
 		{name: "inverted bucket", contents: "defaults:\n  scorer:\n    base:\n      type: heuristic\n      buckets: [{min: 10, max: 1, score: 0.5}]\n"},
+		{name: "factors under heuristic base", contents: "defaults:\n  scorer:\n    base:\n      type: heuristic\n      factors: {pathPassed: 10}\n"},
+		{name: "nested base under heuristic", contents: "defaults:\n  scorer:\n    base:\n      type: heuristic\n      base: {type: heuristic}\n"},
+		{name: "factors on a composite component", contents: "defaults:\n  scorer:\n    base:\n      type: composite\n      components:\n        a:\n          type: heuristic\n          factors: {pathPassed: 10}\n"},
+		{name: "factors under queue overlay base", contents: "defaults: {}\nqueues:\n  - name: q\n    scorer:\n      base:\n        type: heuristic\n        factors: {pathPassed: 10}\n"},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {