Rename the program to sww and its deciding daemon to discriminator

The program is now sww, built from cmd/sww, with two modes: sww rproxy and
sww discriminator. servewaf becomes discriminator everywhere it names that
daemon: the package (internal/discriminator), its types, functions, files, the
discriminator_line log field, and its docs and tests.

smallwebwaf is left only where sneak's directive allows it: the documents'
product name, the git.eeqj.de/sneak/smallwebwaf URLs, and the Go module path
sneak.berlin/go/smallwebwaf. Everywhere else a name containing it takes the sww
form: the package (internal/sww), metric names (sww_*), the X-Sww-* headers,
the /_sww/ admin endpoints, the SWW_COMMAND setting, the OS user, and the state
and rules directories.

No logic changes. make check passes.

Model: deepseek-v4-pro

internal/remotelog/remotelog.go

@@ -1,4 +1,4 @@
-// Package remotelog sends the lines smallwebwaf writes on stdout to the
+// Package remotelog sends the lines sww writes on stdout to the
 // remote log endpoint, SWWAF_LOG_REMOTE_URL, as the "Request log" section
 // of SPEC.md describes: each line as the message of an RFC 5424 syslog
 // record, over UDP, TCP or TLS. Lines wait in a bounded buffer, so a slow

internal/remotelog/remotelog_test.go

@@ -612,7 +612,7 @@ func testCertificate(t *testing.T) (tls.Certificate, *x509.CertPool) {
 
 	template := &x509.Certificate{
 		SerialNumber:          big.NewInt(1),
-		Subject:               pkix.Name{CommonName: "smallwebwaf test CA"},
+		Subject:               pkix.Name{CommonName: "sww test CA"},
 		NotBefore:             time.Date(1999, 12, 31, 0, 0, 0, 0, time.UTC),
 		NotAfter:              time.Date(2000, 1, 2, 0, 0, 0, 0, time.UTC),
 		IsCA:                  true,