test(compat): add deterministic local fixtures

Co-authored-by: naiba/CloudCode <hi+cloudcode@nai.ba>

integration/agentcompat/internal/fixture/fixture_errors.go

@@ -0,0 +1,34 @@
+package fixture
+
+import "errors"
+
+var (
+	ErrPayloadOverrun      = errors.New("fixture payload exceeds transfer limit")
+	ErrPayloadSizeMismatch = errors.New("fixture payload size mismatch")
+)
+
+type PathRejectionReason string
+
+const (
+	PathRejectionEmpty           PathRejectionReason = "empty"
+	PathRejectionAbsolute        PathRejectionReason = "absolute"
+	PathRejectionParent          PathRejectionReason = "parent"
+	PathRejectionVolume          PathRejectionReason = "volume"
+	PathRejectionSeparator       PathRejectionReason = "separator"
+	PathRejectionDestructiveRoot PathRejectionReason = "destructive_root"
+	PathRejectionEscape          PathRejectionReason = "escape"
+	PathRejectionSymlinkParent   PathRejectionReason = "symlink_parent"
+	PathRejectionADS             PathRejectionReason = "ads"
+)
+
+type AgentPathError struct {
+	Reason PathRejectionReason
+}
+
+func (e *AgentPathError) Error() string {
+	return "agent path rejected: " + string(e.Reason)
+}
+
+func rejectPath(reason PathRejectionReason) error {
+	return &AgentPathError{Reason: reason}
+}