T1000-E: Negative temperature values incorrectly displayed due to char signedness

[R6DJO]

Description

The T1000-E sensor variant has a bug that causes negative temperature values to be displayed incorrectly.

Root Cause

The ntc_temp2 lookup table in variants/t1000-e/t1000e_sensors.cpp is declared as char type:

static char ntc_temp2[136] = {
  -30, -29, -28, -27, -26, -25, -24, ...

On some architectures/compilers, char is unsigned by default, which causes negative temperature values (from -30°C to -1°C) to be interpreted incorrectly.

Solution

Change the array type from char to int8_t to ensure signed interpretation:

static int8_t ntc_temp2[136] = {
  -30, -29, -28, -27, -26, -25, -24, ...

Impact

• Affects temperature readings in cold environments (below 0°C)
• Temperature readings may show incorrect values when the actual temperature is negative

Fix

A PR will follow with the fix.