feat(aieos): validate OCEAN values in [0.0, 1.0] range

Address review feedback from @nikolasdehor on PR #469.
Out-of-range psychology values would produce unexpected natural
language output, so we now reject them at load time.

pkg/aieos/loader.go

@@ -47,5 +47,27 @@ func validate(p *Profile) error {
 	if p.Identity.Name == "" {
 		return fmt.Errorf("aieos: identity.name is required")
 	}
+	if p.Psychology != nil {
+		if err := validateOCEAN(p.Psychology); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// validateOCEAN checks that all OCEAN trait values are in [0.0, 1.0].
+func validateOCEAN(psy *Psychology) error {
+	traits := map[string]float64{
+		"openness":          psy.Openness,
+		"conscientiousness": psy.Conscientiousness,
+		"extraversion":      psy.Extraversion,
+		"agreeableness":     psy.Agreeableness,
+		"neuroticism":       psy.Neuroticism,
+	}
+	for name, val := range traits {
+		if val < 0.0 || val > 1.0 {
+			return fmt.Errorf("aieos: psychology.%s must be in [0.0, 1.0], got %v", name, val)
+		}
+	}
 	return nil
 }

pkg/aieos/loader_test.go

@@ -103,3 +103,46 @@ func TestDefaultProfilePath(t *testing.T) {
 	got := DefaultProfilePath("/home/user/workspace")
 	assert.Equal(t, "/home/user/workspace/aieos.json", got)
 }
+
+func TestLoadProfileOCEANOutOfRange(t *testing.T) {
+	tests := []struct {
+		name string
+		json string
+		want string
+	}{
+		{
+			name: "openness too high",
+			json: `{"version":"1.1","identity":{"name":"A"},"psychology":{"openness":1.5}}`,
+			want: "psychology.openness must be in [0.0, 1.0]",
+		},
+		{
+			name: "neuroticism negative",
+			json: `{"version":"1.1","identity":{"name":"A"},"psychology":{"neuroticism":-0.1}}`,
+			want: "psychology.neuroticism must be in [0.0, 1.0]",
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			dir := t.TempDir()
+			path := filepath.Join(dir, "aieos.json")
+			require.NoError(t, os.WriteFile(path, []byte(tt.json), 0644))
+
+			_, err := LoadProfile(path)
+			assert.Error(t, err)
+			assert.Contains(t, err.Error(), tt.want)
+		})
+	}
+}
+
+func TestLoadProfileOCEANValidBoundary(t *testing.T) {
+	dir := t.TempDir()
+	path := filepath.Join(dir, "aieos.json")
+
+	data := `{"version":"1.1","identity":{"name":"A"},"psychology":{"openness":0.0,"conscientiousness":1.0,"extraversion":0.5,"agreeableness":0.0,"neuroticism":1.0}}`
+	require.NoError(t, os.WriteFile(path, []byte(data), 0644))
+
+	p, err := LoadProfile(path)
+	require.NoError(t, err)
+	assert.Equal(t, 0.0, p.Psychology.Openness)
+	assert.Equal(t, 1.0, p.Psychology.Conscientiousness)
+}