feat: add model routing table with three-layer priority

internal/config/models.go

@@ -0,0 +1,43 @@
+package config
+
+import (
+	"fmt"
+	"os"
+
+	"gopkg.in/yaml.v3"
+)
+
+type modelsFile struct {
+	Default string            `yaml:"default"`
+	Skills  map[string]string `yaml:"skills"`
+}
+
+type Models struct {
+	data modelsFile
+}
+
+func LoadModels(path string) (Models, error) {
+	raw, err := os.ReadFile(path)
+	if err != nil {
+		return Models{}, fmt.Errorf("load models: %w", err)
+	}
+	var f modelsFile
+	if err := yaml.Unmarshal(raw, &f); err != nil {
+		return Models{}, fmt.Errorf("parse models: %w", err)
+	}
+	return Models{data: f}, nil
+}
+
+// Resolve returns the model for a skill, respecting three-layer priority:
+// 1. override (from MCP call) — highest
+// 2. per-skill default from models.yaml
+// 3. global default
+func (m Models) Resolve(skill, override string) string {
+	if override != "" {
+		return override
+	}
+	if model, ok := m.data.Skills[skill]; ok {
+		return model
+	}
+	return m.data.Default
+}

internal/config/models_test.go

@@ -0,0 +1,44 @@
+package config_test
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/mathiasbq/supervisor/internal/config"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestModelsResolve(t *testing.T) {
+	yaml := `
+default: ollama/default-model
+skills:
+  tdd: ollama/qwen3-coder-30b-tuned
+  review: ollama/devstral-tuned
+`
+	f := filepath.Join(t.TempDir(), "models.yaml")
+	require.NoError(t, os.WriteFile(f, []byte(yaml), 0644))
+
+	m, err := config.LoadModels(f)
+	require.NoError(t, err)
+
+	assert.Equal(t, "ollama/qwen3-coder-30b-tuned", m.Resolve("tdd", ""))
+	assert.Equal(t, "ollama/devstral-tuned", m.Resolve("review", ""))
+	assert.Equal(t, "ollama/default-model", m.Resolve("unknown", ""))
+}
+
+func TestModelsOverride(t *testing.T) {
+	yaml := `
+default: ollama/default-model
+skills:
+  tdd: ollama/qwen3-coder-30b-tuned
+`
+	f := filepath.Join(t.TempDir(), "models.yaml")
+	require.NoError(t, os.WriteFile(f, []byte(yaml), 0644))
+
+	m, err := config.LoadModels(f)
+	require.NoError(t, err)
+
+	assert.Equal(t, "anthropic/claude-sonnet-4-6", m.Resolve("tdd", "anthropic/claude-sonnet-4-6"))
+}