feat(http1): bound the connect, and FetchHTTP1 for a URL with redirects

- ClientHTTP1 gains connectTimeout (default 15 s), applied to each
  address the host resolves to. `timeout` only ever bounded the waits for
  a response, so a host that drops the SYNs held Send() for the kernel's
  retries, about two minutes, whatever the caller had asked for.
- The default Host header puts an IPv6 literal in brackets.
- FetchHTTP1(url, options) makes one request to an http:// or https://
  URL and follows redirects as Python's urllib does, so urllib code ported
  over keeps its behaviour: 301/302/303/307/308 for GET and HEAD,
  301/302/303 for POST (re-sent as a GET without its body), a relative
  Location resolved as urljoin resolves it and percent-encoded as urllib
  quotes it, http and https hops mixed, each redirect's body read before
  the next request, and the chain stopped by urllib's limits (4 repeats
  of one URL, 10 different URLs) with the last redirect returned and
  `limited` set. Proxies are not consulted.

New: ShouldTimeoutSilentHTTP1, ShouldFollowRedirectsHTTP1.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

project.cpp

@@ -177,6 +177,8 @@ extern "C" Configuration CrafterBuildProject(std::span<const std::string_view> a
         cfg.AddTest("ShouldConnectDualStack").Dependencies({ &cfg });
         cfg.AddTest("ShouldReportConnectErrors").Dependencies({ &cfg });
         cfg.AddTest("ShouldBindLoopbackEphemeral").Dependencies({ &cfg });
+        cfg.AddTest("ShouldTimeoutSilentHTTP1").Dependencies({ &cfg });
+        cfg.AddTest("ShouldFollowRedirectsHTTP1").Dependencies({ &cfg });
         cfg.AddTest("ShouldInteropCurlHTTP1").Dependencies({ &cfg });
         cfg.AddTest("ShouldInteropCurlHTTPS1").Dependencies({ &cfg });
         cfg.AddTest("ShouldParseHTTP1").Dependencies({ &cfg });