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/requestlog/requestlog.go

@@ -1,6 +1,6 @@
-// Package requestlog writes the lines smallwebwaf prints on stdout: one
-// JSON object per request, two from servewaf and a short one from rproxy, marked
-// "type":"request", and the process's own messages as JSON lines marked
+// Package requestlog writes the lines sww prints on stdout: one
+// JSON object per request, two from discriminator and a short one from rproxy,
+// marked "type":"request", and the process's own messages as JSON lines marked
 // "type":"process".
 package requestlog
 
@@ -14,10 +14,10 @@ import (
 	"sneak.berlin/go/smallwebwaf/internal/ratelimit"
 )
 
-// The action a request line names: what servewaf did with the request.
+// The action a request line names: what discriminator did with the request.
 const (
-	// ActionForward is a request servewaf allowed, which rproxy passes to the
-	// app.
+	// ActionForward is a request discriminator allowed, which rproxy passes to
+	// the app.
 	ActionForward = "forward"
 	// ActionTooLarge is a request over the header limits.
 	ActionTooLarge = "too_large"
@@ -42,8 +42,8 @@ const (
 	ActionDenied = "denied"
 	// ActionCountryDenied is a request refused for its client's country.
 	ActionCountryDenied = "country_denied"
-	// ActionAdmin is a request servewaf answered at one of its own endpoints,
-	// or a question about a path under /_smallwebwaf/.
+	// ActionAdmin is a request discriminator answered at one of its own
+	// endpoints, or a question about a path under /_sww/.
 	ActionAdmin = "admin"
 )
 
@@ -56,14 +56,14 @@ const OffenceLimit = "limit"
 // that broke the error burst.
 const LimitHitErrorBurst = "error_burst"
 
-// The servewaf_line a request line names, which says which of servewaf's two
-// lines about a question it is.
+// The discriminator_line a request line names, which says which of
+// discriminator's two lines about a question it is.
 const (
-	// ServeWAFLineDecision is servewaf's line at its decision.
-	ServeWAFLineDecision = "decision"
-	// ServeWAFLineReport is servewaf's line when rproxy's report comes, with
-	// the decision's fields and the report's together.
-	ServeWAFLineReport = "report"
+	// DiscriminatorLineDecision is discriminator's line at its decision.
+	DiscriminatorLineDecision = "decision"
+	// DiscriminatorLineReport is discriminator's line when rproxy's report
+	// comes, with the decision's fields and the report's together.
+	DiscriminatorLineReport = "report"
 )
 
 // timeLayout is RFC 3339 with milliseconds.
@@ -76,9 +76,9 @@ const timeLayout = "2006-01-02T15:04:05.000Z07:00"
 //nolint:tagliatelle // docs/request-log.md names the fields in snake_case
 type Line struct {
 	Type string `json:"type"`
-	// ServeWAFLine is ServeWAFLineDecision or ServeWAFLineReport on servewaf's
-	// two lines about a question.
-	ServeWAFLine string `json:"servewaf_line,omitempty"`
+	// DiscriminatorLine is DiscriminatorLineDecision or DiscriminatorLineReport
+	// on discriminator's two lines about a question.
+	DiscriminatorLine string `json:"discriminator_line,omitempty"`
 
 	// The standard web log fields. Scheme is how the client reached rproxy, or
 	// the trusted proxy in front of it.
@@ -98,7 +98,7 @@ type Line struct {
 	UserAgent     string `json:"user_agent"`
 
 	// Request detail. RequestID is the id rproxy made for the request, or for a
-	// request to servewaf's own endpoints a new one. ForwardedFor is the
+	// request to discriminator's own endpoints a new one. ForwardedFor is the
 	// X-Forwarded-For header as received. ClientGroup is the netblock the
 	// client is counted as. ASN, ASName and Country are the client's AS
 	// number, AS name and country, as looked up.
@@ -118,8 +118,8 @@ type Line struct {
 	HasAuthorization bool              `json:"has_authorization,omitempty"`
 	HasCookie        bool              `json:"has_cookie,omitempty"`
 
-	// Response detail, of servewaf's own answer. Aborted is true when rproxy, or
-	// the admin's tool, went away before the answer.
+	// Response detail, of discriminator's own answer. Aborted is true when
+	// rproxy, or the admin's tool, went away before the answer.
 	ResponseContentType string `json:"response_content_type,omitempty"`
 	Aborted             bool   `json:"aborted,omitempty"`
 
@@ -128,7 +128,7 @@ type Line struct {
 	// WouldAction is, in observe mode, the action enforce mode would have
 	// taken with a request it would have refused: ActionDenied,
 	// ActionBanned, ActionCountryDenied, ActionRateLimited,
-	// ActionRuleBlocked, ActionWAFBlocked, or, in servewaf, ActionTooLarge
+	// ActionRuleBlocked, ActionWAFBlocked, or, in discriminator, ActionTooLarge
 	// for the header limits.
 	WouldAction string `json:"would_action,omitempty"`
 	// LimitPercent and LimitPercentSetting are, for a request the rate
@@ -201,7 +201,7 @@ type RProxyLine struct {
 	// if that is sooner. DurationResponse runs from then until the answer ends.
 	DurationRequest  float64 `json:"duration_request"`
 	DurationResponse float64 `json:"duration_response"`
-	// Disposition is the valid disposition servewaf answered or, while
+	// Disposition is the valid disposition discriminator answered or, while
 	// DefaultDisposition is true, the value of SWRP_DEFAULT_DISPOSITION. It is ""
 	// when neither gave one.
 	Disposition        string `json:"disposition,omitempty"`