TcpOpts still exposes only nodelay #82

Problem

TcpOpts (crates/turnloop/src/types.rs) has exactly one field:

pub struct TcpOpts {
    pub nodelay: bool,
}

Every other pre-connect TCP option a caller might want — a connect timeout, a local bind address, keepalive parameters set at connect time, IPV6_V6ONLY, and so on — has no field to set.

Why it matters

This is P1's and P6's item, unchanged, and Perry's P11 lane (perry-http-client, the perry CLI's HTTP client) hit it again: its report lists it as still open, verbatim "TcpOpts still exposes only nodelay."

Note this is a different gap from turnloop#34 ("No socket options after creation"), which is now closed (implemented in #36, merged 909e92f) and added Loop::set_option/get_option for options changed after a handle exists. TcpOpts is the struct passed at connect time, and it is unaffected by that fix — checked against current main (d0f0167), it still only has nodelay.

What would fix it

Either extend TcpOpts with the connect-time fields callers actually need (a connect timeout is the one every HTTP client reaches for first), or — if the intent is that everything now goes through Loop::set_option/get_option post-creation — say so explicitly in TcpOpts's docs and point callers at the post-creation API, so a caller doesn't have to guess whether the single field is an oversight or a deliberate boundary.