Function decode 

pub fn decode(
    p: &PointDesc<'_>,
    regs: &[u16],
    ctx: &Ctx<'_>,
) -> Result<Value, DecodeError>

Decode a point’s registers into a heap-free Value.

Strings/bytes are not handled here — use decode_str / decode_bytes with a caller buffer (no_std) or the alloc facade.