fix(bonfire): PeekGlobals reads clustered shorthands like -qn and -vq

pflag accepts -qn as -q -n and -vvq as -v -v -q, but PeekGlobals only
read clusters made of v, so the generated main's pre-boot diary setup,
the error block of Execute and passthrough commands missed -q, -n and
-v when they were clustered. Read the cluster letter by letter and stop
at the first letter that is not a global shorthand.

modules/bonfire/globals.go

@@ -73,18 +73,36 @@ func PeekGlobals(args []string) Globals {
 			}
 		case strings.HasPrefix(a, "--"+flagEnv+"="):
 			g.Env = strings.TrimPrefix(a, "--"+flagEnv+"=")
-		case isVerboseShorthand(a):
-			g.Verbosity += len(a) - 1
+		case isShorthandCluster(a):
+			g.peekShorthands(a[1:])
 		}
 	}
 	return g.normalize()
 }
 
-func isVerboseShorthand(a string) bool {
-	if len(a) < 2 || a[0] != '-' || a[1] == '-' {
-		return false
+// isShorthandCluster reports a single-dash token such as -v, -vvv or -qn.
+func isShorthandCluster(a string) bool {
+	return len(a) >= 2 && a[0] == '-' && a[1] != '-'
+}
+
+// peekShorthands reads a cluster of shorthands the way pflag does (-qn is
+// -q -n, -vvq is -v -v -q). It stops at the first letter that is not a
+// global shorthand: that may be a command flag whose value is the rest of
+// the token.
+func (g *Globals) peekShorthands(cluster string) {
+	for _, r := range cluster {
+		switch r {
+		case 'v':
+			g.Verbosity++
+		case 'q':
+			g.Quiet = true
+		case 'n':
+			g.NoInteraction = true
+		case 'h':
+		default:
+			return
+		}
 	}
-	return strings.Trim(a[1:], "v") == ""
 }
 
 func (g Globals) normalize() Globals {