refactor: replace orchestrator/verifier chain with direct LiteLLM calls

Drop the three-layer Claude subprocess orchestration (local model →
Claude verifier → cloud escalation). Skills now call LiteLLM directly
and return plain text to Claude Code, which decides what to do with it.

- Delete executor, orchestrator, verifier, result, attempts packages
- Simplify LiteLLMExecutor: Run(Request)→Result becomes Complete(model,sys,user)→(string,int64,error)
- Replace ExecutorFn with CompleteFunc in all 6 skill configs
- Rewrite all skill handlers to call Complete and return {"text","model","duration_ms"}
- Simplify config/models: remove Verifier/LlamaSwapURL, add ModelFor
- Bump version to v0.5.0

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

internal/skills/debug/handlers_test.go

@@ -6,7 +6,6 @@ import (
 	"encoding/json"
 	"testing"
 
-	iexec "github.com/mathiasbq/supervisor/internal/exec"
 	"github.com/mathiasbq/supervisor/internal/skills/debug"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
@@ -33,29 +32,22 @@ func TestDebugRequiresError(t *testing.T) {
 	assert.ErrorContains(t, err, "error")
 }
 
-func TestDebugCallsExecutor(t *testing.T) {
-	called := false
+func TestDebugCallsCompleteFunc(t *testing.T) {
 	var capturedTask string
-	fakeFn := func(_ context.Context, req iexec.Request) (iexec.Result, error) {
-		called = true
-		capturedTask = req.TaskPrompt
-		return iexec.Result{
-			Status: "pass", Phase: "debug", Skill: "debug",
-			RunnerOutput: "HYPOTHESIS 1 (likelihood: high): nil map access\nVERIFY: go test ./... → expected: panic line reference",
-			Verified:     false, ModelUsed: "self", Message: "3 hypotheses for: panic nil pointer at foo.go:42",
-		}, nil
+	fakeFn := func(_ context.Context, _, _, user string) (string, int64, error) {
+		capturedTask = user
+		return "HYPOTHESIS 1 (high): nil map access. Verify: go test ./...", 90, nil
 	}
 
-	sk := debug.New(debug.Config{SkillPrompt: "debug rules", ExecutorFn: fakeFn, SessionsDir: t.TempDir()})
+	sk := debug.New(debug.Config{SkillPrompt: "debug rules", CompleteFunc: fakeFn, SessionsDir: t.TempDir()})
 	out, err := sk.Handle(context.Background(), "debug", json.RawMessage(
 		`{"project_root":"/tmp/proj","error":"panic: nil pointer dereference at foo.go:42","context":"occurs on startup"}`,
 	))
 	require.NoError(t, err)
-	assert.True(t, called)
 	assert.Contains(t, capturedTask, "panic: nil pointer dereference")
 	assert.Contains(t, capturedTask, "occurs on startup")
 
-	var result iexec.Result
+	var result map[string]any
 	require.NoError(t, json.Unmarshal(out, &result))
-	assert.Equal(t, "debug", result.Phase)
+	assert.Contains(t, result["text"], "nil map access")
 }