Feat v0.9.2 Starlark converter consolidation + snapshot cleanup (#75)

Consolidate duplicate Go↔Starlark converters into sandbox/convert.go
and snapshot parsers into models/snapshot.go. Standardize snapshot
creation on wrapped format. Net -393 lines across 21 files.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

server/triggers/event.go

@@ -3,7 +3,6 @@ package triggers
 import (
 	"context"
 	"encoding/json"
-	"fmt"
 	"log"
 	"time"
 
@@ -72,7 +71,7 @@ func (e *Engine) fireEventTrigger(triggerID, packageID, entryPoint string, ev ev
 	if len(ev.Payload) > 0 {
 		var payloadMap map[string]any
 		if json.Unmarshal(ev.Payload, &payloadMap) == nil {
-			_ = ctxDict.SetKey(starlark.String("event_payload"), mapToStarlark(payloadMap))
+			_ = ctxDict.SetKey(starlark.String("event_payload"), sandbox.MapToDict(payloadMap))
 		} else {
 			_ = ctxDict.SetKey(starlark.String("event_payload"), starlark.String(string(ev.Payload)))
 		}
@@ -114,43 +113,6 @@ func (e *Engine) hasPermission(ctx context.Context, packageID, permission string
 	return false
 }
 
-// mapToStarlark converts a map[string]any to a Starlark dict.
-func mapToStarlark(m map[string]any) *starlark.Dict {
-	d := starlark.NewDict(len(m))
-	for k, v := range m {
-		_ = d.SetKey(starlark.String(k), goToStarlark(v))
-	}
-	return d
-}
-
-// goToStarlark converts a Go value to a Starlark value.
-func goToStarlark(v any) starlark.Value {
-	switch val := v.(type) {
-	case nil:
-		return starlark.None
-	case bool:
-		return starlark.Bool(val)
-	case int:
-		return starlark.MakeInt(val)
-	case int64:
-		return starlark.MakeInt64(val)
-	case float64:
-		return starlark.Float(val)
-	case string:
-		return starlark.String(val)
-	case map[string]any:
-		return mapToStarlark(val)
-	case []any:
-		elems := make([]starlark.Value, len(val))
-		for i, e := range val {
-			elems[i] = goToStarlark(e)
-		}
-		return starlark.NewList(elems)
-	default:
-		return starlark.String(fmt.Sprintf("%v", val))
-	}
-}
-
 // RunContext builds a sandbox.RunContext for a trigger invocation.
 func triggerRunContext(userID, teamID string) *sandbox.RunContext {
 	if userID == "" {