diff --git a/configuration_diff_contract_test.go b/configuration_diff_contract_test.go
index 897390d..8515aef 100644
--- a/configuration_diff_contract_test.go
+++ b/configuration_diff_contract_test.go
@@ -81,6 +81,34 @@ func TestConfigurationInspectionDiffIgnoresSourceHistory(t *testing.T) {
 	}
 }
 
+func TestConfigurationInspectionDiffUsesNormalizedValues(t *testing.T) {
+	inspect := func(endpoint string) promptkit.ConfigurationInspection {
+		t.Helper()
+		engine, err := promptkit.NewEngine(promptkit.Config{Sources: promptkit.ConfigurationSources{Underlays: []configkit.Underlay{{Inputs: []configkit.Input{{Source: configkit.Mapping("backend", map[string]any{
+			"backends": []any{map[string]any{"id": "local", "endpoint": endpoint}},
+		})}}}}}})
+		if err != nil {
+			t.Fatal(err)
+		}
+		view, err := engine.InspectConfiguration()
+		if err != nil {
+			t.Fatal(err)
+		}
+		return view
+	}
+	left := inspect(" HTTPS://example.invalid/v1 ")
+	equal := inspect("https://example.invalid/v1")
+	differences, err := left.Diff(equal)
+	if err != nil || len(differences) != 0 {
+		t.Fatalf("normalized diff = %+v, %v", differences, err)
+	}
+	changed := inspect("https://other.invalid/v1")
+	differences, err = left.Diff(changed)
+	if err != nil || len(differences) != 1 || differences[0].Path.String() != "/backends" {
+		t.Fatalf("changed diff = %+v, %v", differences, err)
+	}
+}
+
 func TestConfigurationInspectionDiffReportsPresenceAndSequences(t *testing.T) {
 	left := comparisonInspectionFrom(t, "before", "same-model", map[string]any{
 		"sequence": []any{"earlier", "unchanged"},
diff --git a/configuration_inspection_contract_test.go b/configuration_inspection_contract_test.go
index a7d5631..a2d94bf 100644
--- a/configuration_inspection_contract_test.go
+++ b/configuration_inspection_contract_test.go
@@ -21,7 +21,7 @@ func TestConfigurationInspectionReportsLiteralKeysAndRedactedHistory(t *testing.
 		Underlays: []configkit.Underlay{
 			{Inputs: []configkit.Input{{Source: configkit.Mapping("defaults", map[string]any{
 				"backends": []any{map[string]any{
-					"id": "local", "endpoint": "https://example.invalid/v1", "api_key_env": "OPTIONAL_KEY",
+					"id": "local", "endpoint": " HTTPS://example.invalid/v1 ", "api_key_env": "OPTIONAL_KEY",
 					"extra_params": map[string]any{"token": "private-sentinel", "visible": "public-value"},
 				}},
 				"collections": map[string]any{"literal": map[string]any{
@@ -64,6 +64,11 @@ func TestConfigurationInspectionReportsLiteralKeysAndRedactedHistory(t *testing.
 		t.Fatalf("literal-key path = %q", inheritedPath)
 	}
 	secretPath := configkit.Keys("backends").Index(0).Key("extra_params").Key("token")
+	endpointPath := configkit.Keys("backends").Index(0).Key("endpoint")
+	endpoint, found := view.Explain(endpointPath)
+	if !found || !strings.Contains(endpoint.Effective.YAML, "https://example.invalid/v1") || strings.Contains(fmt.Sprintf("%+v", view.Metadata().History(endpointPath)), "private-sentinel") {
+		t.Fatalf("normalized endpoint explanation = %+v", endpoint)
+	}
 	secret, found := view.Explain(secretPath)
 	if !found || !secret.Effective.Redacted || strings.Contains(secret.Effective.YAML, "private-sentinel") {
 		t.Fatalf("credential-shaped provider value was not redacted: (%+v, %t)", secret, found)
diff --git a/docs/roadmap/implementation.md b/docs/roadmap/implementation.md
index 9539af7..0d5fbdb 100644
--- a/docs/roadmap/implementation.md
+++ b/docs/roadmap/implementation.md
@@ -221,6 +221,10 @@ Scope: focused configuration tests and existing public inspection/diff tests.
 Validation: focused configuration, public inspection/diff, preparation, and
 execution tests. All new tests use deterministic offline sources/collaborators.
 
+Completion: focused tests cover recorded target dependencies, imported content
+origins, invalid identities, normalized-value diffs, and sensitive inspection.
+Configuration, engine, and public API tests pass on Go 1.27.0.
+
 ## Stage 6: Align Documentation And Verify The Sprint
 
 Scope: current contract/implementation documentation and final integration.
diff --git a/internal/configuration/interpretation_test.go b/internal/configuration/interpretation_test.go
index 0bed8ec..4a29c97 100644
--- a/internal/configuration/interpretation_test.go
+++ b/internal/configuration/interpretation_test.go
@@ -117,3 +117,36 @@ func TestPromptResolutionRecordsMessageFields(t *testing.T) {
 		t.Fatal("null input metadata was not retained")
 	}
 }
+
+func TestResolutionRecordsTargetDependencies(t *testing.T) {
+	backend := func(id string) map[string]any {
+		return map[string]any{"id": id, "endpoint": " HTTPS://example.invalid/v1 ", "concurrency_limit": 2, "queue_capacity": nil}
+	}
+	state, err := load(mapping("targets", map[string]any{
+		"backends":    []any{backend("root")},
+		"collections": map[string]any{"scoped": map[string]any{"backends": []any{backend("local")}}},
+	}), nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, base := range []configkit.Path{configkit.Keys("backends").Index(0), configkit.Keys("collections", "scoped", "backends").Index(0)} {
+		endpoint, ok := state.result.Explain(base.Key("endpoint"))
+		if !ok || !strings.Contains(endpoint.Effective.YAML, "https://example.invalid/v1") {
+			t.Fatalf("endpoint explanation: %+v", endpoint)
+		}
+		history := state.result.Metadata().History(base.Key("queue_capacity"))
+		found := false
+		for _, change := range history {
+			if change.Origin.Operation == configkit.ChangeDerivedDefault {
+				for _, dependency := range change.Dependencies {
+					if dependency.String() == base.Key("concurrency_limit").String() {
+						found = true
+					}
+				}
+			}
+		}
+		if !found {
+			t.Fatalf("missing queue dependency: %+v", history)
+		}
+	}
+}
diff --git a/internal/configuration/load_test.go b/internal/configuration/load_test.go
index 8d2bdca..e3eae5c 100644
--- a/internal/configuration/load_test.go
+++ b/internal/configuration/load_test.go
@@ -153,6 +153,50 @@ func TestIdentifiedResourcesRejectDuplicateStrictPeers(t *testing.T) {
 	}
 }
 
+func TestInvalidIdentitiesWithNormalizableFieldsAreRejected(t *testing.T) {
+	for _, kind := range []string{"backends", "profiles", "prompts"} {
+		for _, id := range []string{" ", "bad/id"} {
+			t.Run(kind+"/"+id, func(t *testing.T) {
+				record := map[string]any{"id": id}
+				switch kind {
+				case "backends":
+					record["endpoint"] = " HTTPS://example.invalid/v1 "
+					record["concurrency_limit"] = 1
+				case "profiles":
+					record["service_tier"] = " standard "
+				case "prompts":
+					record["description"] = " padded "
+				}
+				_, err := load(mapping("invalid", map[string]any{kind: []any{record}}), nil)
+				if err == nil || strings.Contains(strings.ToLower(err.Error()), "unrecorded") {
+					t.Fatalf("invalid identity error = %v", err)
+				}
+			})
+		}
+	}
+}
+
+func TestDuplicateIdentitiesWithNormalizableFieldsAreRejected(t *testing.T) {
+	for _, kind := range []string{"backends", "profiles", "prompts"} {
+		t.Run(kind, func(t *testing.T) {
+			record := map[string]any{"id": "same"}
+			switch kind {
+			case "backends":
+				record["endpoint"] = " HTTPS://example.invalid/v1 "
+				record["concurrency_limit"] = 1
+			case "profiles":
+				record["service_tier"] = " standard "
+			case "prompts":
+				record["description"] = " padded "
+			}
+			_, err := load(mapping("duplicates", map[string]any{kind: []any{record, record}}), nil)
+			if err == nil || strings.Contains(strings.ToLower(err.Error()), "unrecorded") {
+				t.Fatalf("duplicate identity error = %v", err)
+			}
+		})
+	}
+}
+
 func TestFinalIdentitiesAreCheckedAfterApplicationResolution(t *testing.T) {
 	for _, kind := range []string{"backends", "profiles", "prompts"} {
 		for _, namespace := range []string{"", "*"} {
diff --git a/internal/configuration/prompts_test.go b/internal/configuration/prompts_test.go
index cb13733..916fca6 100644
--- a/internal/configuration/prompts_test.go
+++ b/internal/configuration/prompts_test.go
@@ -16,7 +16,7 @@ import (
 
 func TestLoadCapturesInheritedImportedContent(t *testing.T) {
 	files := fstest.MapFS{
-		"app/main.yaml":         {Data: []byte("config:\n  imports:\n    - path: ../catalog/base.yaml\n      required: true\ncollections:\n  docs:\n    prompts:\n      - id: child\n        extends: {id: base}\n  other:\n    prompts:\n      - id: child\n        messages:\n          - role: user\n            content_file: ./body.md\n        output:\n          format: text\n          validation_mode: none\n")},
+		"app/main.yaml":         {Data: []byte("config:\n  imports:\n    - path: ../catalog/base.yaml\n      required: true\ncollections:\n  docs:\n    prompts:\n      - id: child\n        extends: {id: base}\n        description: ' description '\n  other:\n    prompts:\n      - id: child\n        messages:\n          - role: user\n            content_file: ./body.md\n        output:\n          format: text\n          validation_mode: none\n")},
 		"app/body.md":           {Data: []byte("Replacement {{.name}}")},
 		"catalog/base.yaml":     {Data: []byte("collections:\n  docs:\n    release_version: r1\n    prompts:\n      - id: base\n        description: ' description '\n        session_id: ' session '\n        inputs:\n          - name: ' document '\n            content_type: ' text/plain '\n            description: ' document source '\n        messages:\n          - role: ' USER '\n            cache_control:\n              type: ' ephemeral '\n              ttl: ' 1h '\n            content_file: ./body.md\n        output:\n          format: text\n          validation_mode: basic\n")},
 		"catalog/body.md":       {Data: []byte("Captured {{.name}}")},