Feat v0.9.5 typed forms SDK primitive

Extract typed form system from models/workflow.go into standalone
server/forms/ package. Any package can now declare and validate
forms, not just workflow stages.

- New server/forms/ package (types + validation + condition evaluator)
- REST POST /api/v1/forms/validate endpoint
- Starlark forms.validate(template, data) module
- Frontend sw.forms.render(), .validate(), .validateRemote()
- Manifest form_template accepted at package level
- 16 new tests (12 forms + 4 Starlark module)

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

server/sandbox/forms_module.go

@@ -0,0 +1,86 @@
+package sandbox
+
+// forms_module.go
+//
+// Starlark forms module — validates form data against typed form templates.
+// Gated by the forms.validate extension permission.
+//
+// Starlark API:
+//   result = forms.validate(template, data)
+//   # result["valid"]  → True/False
+//   # result["errors"] → [{"key": "...", "message": "..."}, ...]
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+
+	"go.starlark.net/starlark"
+	"go.starlark.net/starlarkstruct"
+
+	"armature/forms"
+)
+
+// BuildFormsModule creates the "forms" Starlark module.
+// Requires the forms.validate permission.
+func BuildFormsModule(_ context.Context) *starlarkstruct.Module {
+	return MakeModule("forms", starlark.StringDict{
+		"validate": starlark.NewBuiltin("forms.validate", formsValidateBuiltin()),
+	})
+}
+
+func formsValidateBuiltin() func(*starlark.Thread, *starlark.Builtin, starlark.Tuple, []starlark.Tuple) (starlark.Value, error) {
+	return func(_ *starlark.Thread, b *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
+		var templateVal, dataVal starlark.Value
+		if err := starlark.UnpackPositionalArgs(b.Name(), args, kwargs, 2, &templateVal, &dataVal); err != nil {
+			return nil, err
+		}
+
+		// Convert template dict → Go map → JSON → TypedFormTemplate
+		templateDict, ok := templateVal.(*starlark.Dict)
+		if !ok {
+			return nil, fmt.Errorf("forms.validate: template must be a dict, got %s", templateVal.Type())
+		}
+		templateMap := DictToMap(templateDict)
+		templateJSON, err := json.Marshal(templateMap)
+		if err != nil {
+			return nil, fmt.Errorf("forms.validate: failed to marshal template: %w", err)
+		}
+
+		tpl := forms.ParseTypedFormTemplate(json.RawMessage(templateJSON))
+		if tpl == nil {
+			return nil, fmt.Errorf("forms.validate: template is invalid or empty")
+		}
+
+		// Convert data dict → Go map
+		dataDict, ok := dataVal.(*starlark.Dict)
+		if !ok {
+			return nil, fmt.Errorf("forms.validate: data must be a dict, got %s", dataVal.Type())
+		}
+		dataMap := DictToMap(dataDict)
+
+		// Coerce to map[string]interface{}
+		data := make(map[string]interface{}, len(dataMap))
+		for k, v := range dataMap {
+			data[k] = v
+		}
+
+		// Validate
+		errs := forms.ValidateFormData(tpl, data)
+
+		// Build result dict
+		errList := make([]starlark.Value, len(errs))
+		for i, e := range errs {
+			d := starlark.NewDict(2)
+			_ = d.SetKey(starlark.String("key"), starlark.String(e.Key))
+			_ = d.SetKey(starlark.String("message"), starlark.String(e.Message))
+			errList[i] = d
+		}
+
+		result := starlark.NewDict(2)
+		_ = result.SetKey(starlark.String("valid"), starlark.Bool(len(errs) == 0))
+		_ = result.SetKey(starlark.String("errors"), starlark.NewList(errList))
+
+		return result, nil
+	}
+}

server/sandbox/forms_module_test.go

@@ -0,0 +1,116 @@
+package sandbox
+
+import (
+	"context"
+	"testing"
+
+	"go.starlark.net/starlark"
+)
+
+func runFormsScript(t *testing.T, script string) starlark.StringDict {
+	t.Helper()
+	mod := BuildFormsModule(context.Background())
+	predeclared := starlark.StringDict{"forms": mod}
+	globals, err := starlark.ExecFile(&starlark.Thread{Name: "test"}, "test.star", script, predeclared)
+	if err != nil {
+		t.Fatal(err)
+	}
+	return globals
+}
+
+func TestFormsModule_ValidateValid(t *testing.T) {
+	globals := runFormsScript(t, `
+tpl = {
+    "fields": [
+        {"key": "name", "type": "text", "label": "Name", "required": True},
+        {"key": "email", "type": "email", "label": "Email"},
+    ]
+}
+result = forms.validate(tpl, {"name": "Alice", "email": "alice@example.com"})
+`)
+	result := globals["result"].(*starlark.Dict)
+	valid, _, _ := result.Get(starlark.String("valid"))
+	if valid != starlark.True {
+		t.Fatalf("expected valid=True, got %v", valid)
+	}
+	errors, _, _ := result.Get(starlark.String("errors"))
+	errList := errors.(*starlark.List)
+	if errList.Len() != 0 {
+		t.Fatalf("expected 0 errors, got %d", errList.Len())
+	}
+}
+
+func TestFormsModule_ValidateRequired(t *testing.T) {
+	globals := runFormsScript(t, `
+tpl = {
+    "fields": [
+        {"key": "name", "type": "text", "label": "Name", "required": True},
+    ]
+}
+result = forms.validate(tpl, {})
+`)
+	result := globals["result"].(*starlark.Dict)
+	valid, _, _ := result.Get(starlark.String("valid"))
+	if valid != starlark.False {
+		t.Fatalf("expected valid=False, got %v", valid)
+	}
+	errors, _, _ := result.Get(starlark.String("errors"))
+	errList := errors.(*starlark.List)
+	if errList.Len() != 1 {
+		t.Fatalf("expected 1 error, got %d", errList.Len())
+	}
+	errDict := errList.Index(0).(*starlark.Dict)
+	key, _, _ := errDict.Get(starlark.String("key"))
+	if key.(starlark.String).GoString() != "name" {
+		t.Fatalf("expected error key 'name', got %v", key)
+	}
+}
+
+func TestFormsModule_ValidateTypeErrors(t *testing.T) {
+	globals := runFormsScript(t, `
+tpl = {
+    "fields": [
+        {"key": "age", "type": "number", "label": "Age", "validation": {"min": 0, "max": 150}},
+        {"key": "email", "type": "email", "label": "Email"},
+    ]
+}
+result = forms.validate(tpl, {"age": -5, "email": "bad"})
+`)
+	result := globals["result"].(*starlark.Dict)
+	valid, _, _ := result.Get(starlark.String("valid"))
+	if valid != starlark.False {
+		t.Fatalf("expected valid=False, got %v", valid)
+	}
+	errors, _, _ := result.Get(starlark.String("errors"))
+	errList := errors.(*starlark.List)
+	if errList.Len() != 2 {
+		t.Fatalf("expected 2 errors, got %d", errList.Len())
+	}
+}
+
+func TestFormsModule_ValidateCondition(t *testing.T) {
+	globals := runFormsScript(t, `
+tpl = {
+    "fields": [
+        {"key": "type", "type": "text", "label": "Type"},
+        {"key": "details", "type": "text", "label": "Details", "required": True,
+         "condition": {"when": "type", "op": "eq", "value": "other"}},
+    ]
+}
+# Condition not met — details not required
+result1 = forms.validate(tpl, {"type": "normal"})
+# Condition met — details required
+result2 = forms.validate(tpl, {"type": "other"})
+`)
+	result1 := globals["result1"].(*starlark.Dict)
+	valid1, _, _ := result1.Get(starlark.String("valid"))
+	if valid1 != starlark.True {
+		t.Fatalf("result1: expected valid=True, got %v", valid1)
+	}
+
+	result2 := globals["result2"].(*starlark.Dict)
+	valid2, _, _ := result2.Get(starlark.String("valid"))
+	if valid2 != starlark.False {
+		t.Fatalf("result2: expected valid=False, got %v", valid2)
+	}
+}

server/sandbox/runner.go

@@ -417,6 +417,9 @@ func (r *Runner) buildModulesWithLibCtx(ctx context.Context, packageID string, m
 				})
 			}
 
+		case models.ExtPermFormValidate:
+			modules["forms"] = BuildFormsModule(ctx)
+
 		case models.ExtPermBatchExec:
 			hasBatchExec = true
 		}