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 OS user, and the state and rules directories.
The SWWAF_ environment variables take the SWW_ form.

No logic changes. make check passes.

Model: deepseek-v4-pro

internal/reputation/reputation.go

@@ -1,10 +1,10 @@
 // Package reputation fetches the lists the settings name by URL: the
-// blocklists of SWWAF_BLOCKLIST_URLS, the file of AS:percent lines
-// SWWAF_ASN_LIMIT_PERCENT_URL names, and the decision list of the CrowdSec
-// engine SWWAF_CROWDSEC_LAPI_URL names. It keeps the last good copy of
+// blocklists of SWW_BLOCKLIST_URLS, the file of AS:percent lines
+// SWW_ASN_LIMIT_PERCENT_URL names, and the decision list of the CrowdSec
+// engine SWW_CROWDSEC_LAPI_URL names. It keeps the last good copy of
 // each, whole, comment lines included, which is used while a fetch fails,
 // and when each was last tried. It also asks the DNSBL zones of
-// SWWAF_DNSBL_ZONES about clients, and keeps their verdicts, and checks
+// SWW_DNSBL_ZONES about clients, and keeps their verdicts, and checks
 // clients with AbuseIPDB, and keeps their scores and the checks spent
 // today. The state package writes all of these to reputation.json and
 // reads them from it, so that a restart keeps them too.
@@ -66,18 +66,18 @@ type List struct {
 
 // Params are what New needs.
 type Params struct {
-	// BlocklistURLs are the blocklists (SWWAF_BLOCKLIST_URLS), and
+	// BlocklistURLs are the blocklists (SWW_BLOCKLIST_URLS), and
 	// ASNLimitPercentURL the file of AS:percent lines
-	// (SWWAF_ASN_LIMIT_PERCENT_URL), "" while it is unset.
+	// (SWW_ASN_LIMIT_PERCENT_URL), "" while it is unset.
 	BlocklistURLs      []string
 	ASNLimitPercentURL string
 	// CrowdSecDecisionsURL is the CrowdSec decision list, "" while
-	// SWWAF_CROWDSEC_LAPI_URL is unset, fetched with CrowdSecKey
-	// (SWWAF_CROWDSEC_LAPI_KEY).
+	// SWW_CROWDSEC_LAPI_URL is unset, fetched with CrowdSecKey
+	// (SWW_CROWDSEC_LAPI_KEY).
 	CrowdSecDecisionsURL string
 	CrowdSecKey          string
 	// Refresh is how long after a list was last fetched or tried it is
-	// fetched again (SWWAF_BLOCKLIST_REFRESH), but for the CrowdSec decision
+	// fetched again (SWW_BLOCKLIST_REFRESH), but for the CrowdSec decision
 	// list, which is fetched again crowdSecRefresh after.
 	Refresh time.Duration
 	// Now tells the time, normally time.Now in UTC.
@@ -152,7 +152,7 @@ func New(params Params) *Lists {
 }
 
 // URLs returns the URL of every list: the blocklists' in the order
-// SWWAF_BLOCKLIST_URLS names them, then SWWAF_ASN_LIMIT_PERCENT_URL, then
+// SWW_BLOCKLIST_URLS names them, then SWW_ASN_LIMIT_PERCENT_URL, then
 // the CrowdSec decision list's.
 func (l *Lists) URLs() []string {
 	urls := slices.Clone(l.params.BlocklistURLs)
@@ -168,7 +168,7 @@ func (l *Lists) URLs() []string {
 }
 
 // ListedBy returns the URLs of the blocklists whose copy lists addr, in
-// the order SWWAF_BLOCKLIST_URLS names them.
+// the order SWW_BLOCKLIST_URLS names them.
 func (l *Lists) ListedBy(addr netip.Addr) []string {
 	l.mu.Lock()
 	defer l.mu.Unlock()
@@ -371,7 +371,7 @@ func (l *Lists) due(listURL string) time.Time {
 // fetch fetches the list at listURL, and notes the try. A good copy takes
 // the place of the one held. A failure leaves that in use, and is counted,
 // logged and raised as a source_failure alert. A fetch cut off as ctx
-// ends, as smallwebwaf stops, is no failure, but is still noted as a try,
+// ends, as sww stops, is no failure, but is still noted as a try,
 // so that a restart waits for it: the server may have had its request.
 func (l *Lists) fetch(ctx context.Context, listURL string) {
 	lines, err := l.get(ctx, listURL)
@@ -551,7 +551,7 @@ func parseNetblock(text string) (netip.Prefix, bool) {
 }
 
 // parsePercents reads the lines of the file of AS:percent lines, each an
-// AS number, : and a percentage, as SWWAF_ASN_LIMIT_PERCENT takes them. An
+// AS number, : and a percentage, as SWW_ASN_LIMIT_PERCENT takes them. An
 // AS number listed more than once gets the lowest of its percentages.
 func parsePercents(lines []string) (entries, error) {
 	found := entries{percents: map[string]int64{}}