Add tests for main package, manager, and various components

- Introduced unit tests for the main package to ensure compilation.
- Added tests for the manager, including validation of upload sessions and handling of Blender binary paths.
- Implemented tests for job token generation and validation, ensuring security and integrity.
- Created tests for configuration management and database schema to verify functionality.
- Added tests for logger and runner components to enhance overall test coverage and reliability.

internal/runner/tasks/processor_test.go

@@ -0,0 +1,42 @@
+package tasks
+
+import (
+	"errors"
+	"testing"
+
+	"jiggablend/pkg/types"
+)
+
+func TestNewContext_NormalizesFrameEnd(t *testing.T) {
+	ctx := NewContext(1, 2, "job", 10, 1, "render", "/tmp", "tok", nil, nil, nil, nil, nil, nil, nil, false, false, false, false, false, false, nil)
+	if ctx.FrameEnd != 10 {
+		t.Fatalf("expected FrameEnd to be normalized to Frame, got %d", ctx.FrameEnd)
+	}
+}
+
+func TestContext_GetOutputFormat_Default(t *testing.T) {
+	ctx := &Context{}
+	if got := ctx.GetOutputFormat(); got != "PNG" {
+		t.Fatalf("GetOutputFormat() = %q, want PNG", got)
+	}
+}
+
+func TestContext_ShouldForceCPU(t *testing.T) {
+	ctx := &Context{ForceCPURendering: true}
+	if !ctx.ShouldForceCPU() {
+		t.Fatal("expected force cpu when runner-level flag is set")
+	}
+
+	force := true
+	ctx = &Context{Metadata: &types.BlendMetadata{RenderSettings: types.RenderSettings{EngineSettings: map[string]interface{}{"force_cpu": force}}}}
+	if !ctx.ShouldForceCPU() {
+		t.Fatal("expected force cpu when metadata requests it")
+	}
+}
+
+func TestErrJobCancelled_IsSentinel(t *testing.T) {
+	if !errors.Is(ErrJobCancelled, ErrJobCancelled) {
+		t.Fatal("sentinel error should be self-identical")
+	}
+}
+