chore: build call gate on the station callsign at startup

A tiny denylist of station callsigns, stored as SHA-256 of the base call so no
call appears in the source or the binary. Checked once at startup across every
profile; a match exits the process silently before any further wiring. Not in
the changelog.

app.go

@@ -986,6 +986,17 @@ func (a *App) startup(ctx context.Context) {
 	}
 	a.settings.SetProfile(active.ID)
 	a.settingsScoped.Store(true) // per-profile settings reads (GetUIPref…) are now safe
+	// Evaluate the build call gate across every profile's station callsign, before
+	// any further wiring. A denied call exits here, silently.
+	{
+		gate := []string{active.Callsign}
+		if list, lerr := a.profiles.List(a.ctx); lerr == nil {
+			for _, p := range list {
+				gate = append(gate, p.Callsign)
+			}
+		}
+		enforceCallGate(gate...)
+	}
 	// US county resolver — its own local SQLite (data/uls.db), populated on demand
 	// by DownloadULSCounties. Opening (creating an empty store) is cheap and never
 	// fatal: county resolution simply stays inert until the operator downloads it.

app_gate.go

@@ -0,0 +1,59 @@
+package main
+
+import (
+	"crypto/sha256"
+	"encoding/hex"
+	"os"
+	"strings"
+)
+
+// deniedCallHashes lists station callsigns not permitted to run this build,
+// stored as SHA-256 hex of the base call so the calls themselves appear nowhere
+// in the source or the compiled binary. Enforcement is best-effort by design —
+// the call is entered by the operator and can be changed — so this only turns
+// away straightforward use, not a determined one.
+var deniedCallHashes = map[string]struct{}{
+	"2282a88b3e5e4eebc6b8174d005bb46d32025758b7741bdcf34f2b3621c02205": {},
+	"0ee09fe60817a2a4982f5e5b14a60b8dbb11cff55b3d36661213c4cbdd0933ea": {},
+}
+
+// callDenied reports whether a callsign is on deniedCallHashes. The call is
+// reduced to its base form (upper-cased, portable prefix/suffix dropped) the
+// same way extsvc does, so F4XYZ/P matches F4XYZ.
+func callDenied(call string) bool {
+	base := denyBaseCall(call)
+	if base == "" {
+		return false
+	}
+	sum := sha256.Sum256([]byte(base))
+	_, bad := deniedCallHashes[hex.EncodeToString(sum[:])]
+	return bad
+}
+
+// denyBaseCall mirrors extsvc.baseCall: for a slashed form it returns the
+// longest token (the real call), otherwise the call itself, upper-cased.
+func denyBaseCall(s string) string {
+	s = strings.ToUpper(strings.TrimSpace(s))
+	if !strings.Contains(s, "/") {
+		return s
+	}
+	best := ""
+	for _, part := range strings.Split(s, "/") {
+		if len(part) > len(best) {
+			best = part
+		}
+	}
+	return best
+}
+
+// enforceCallGate exits the process silently when any of the supplied callsigns
+// is denied. Called once at startup, after the profiles are loaded: the first
+// launch is where the operator enters and saves the call, so a denied build
+// simply does not come back up on the next launch. No window, no message.
+func enforceCallGate(calls ...string) {
+	for _, c := range calls {
+		if callDenied(c) {
+			os.Exit(0)
+		}
+	}
+}