Release 3.8.1.1: lighter idle UI poll, core cache, multicore ping.

Reduce idle CPU (cheap PollUI, binary cache, logbuf cap, DOM fingerprint),
speed ping/AWG HostPort, CopyBuffer pool; ship arm64 build and update notes.

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/config/profiles.go

@@ -29,6 +29,20 @@ func (c *Config) ListProfiles() []ProfileInfo {
 	return out
 }
 
+// ListProfilesForPoll is like ListProfiles but omits Proxy URIs (cheaper idle polls).
+func (c *Config) ListProfilesForPoll() []ProfileInfo {
+	out := make([]ProfileInfo, 0, len(c.Profiles))
+	for _, p := range c.Profiles {
+		out = append(out, ProfileInfo{
+			Name:     p.Name,
+			Protocol: string(p.Protocol),
+			Host:     proxyHost(p.Proxy),
+			Active:   p.Name == c.Active,
+		})
+	}
+	return out
+}
+
 // RedactProfileList clears Proxy URIs from a profile list (host/protocol remain).
 // Use for periodic UI polls so credentials are not echoed for every profile.
 func RedactProfileList(in []ProfileInfo) []ProfileInfo {