siri: drop generic shortcut and broaden fuel-word phrases

Siri was hit-and-miss on 'unleaded near me' (\u2018can't do that, searching
in app\u2019 fallback). The generic parameterized AppShortcut ('cheapest
${fuel}') competed with the fixed-fuel literal-word shortcuts for the same
intent, degrading NLU ranking; it was already documented as flaky. Remove it
(now 9 shortcuts, under the 10 cap) and add natural phrase variants for
unleaded/petrol ('What's the cheapest unleaded near me', 'Cheapest unleaded
near me', 'Where's the cheapest petrol'). All phrases keep .applicationName
per the iOS 26 metadata requirement. Build-verified in extract.actionsdata:
generic gone, new phrases registered.

FuelBoard/SiriShortcuts.swift

@@ -489,19 +489,14 @@ struct FuelMessageSnippetIntent: SnippetIntent {
 
 struct FuelBoardShortcuts: AppShortcutsProvider {
     static var appShortcuts: [AppShortcut] {
-        // Generic parameterized shortcut — matches whatever fuel word Siri
+        // NOTE (2026-08-20): the generic parameterized shortcut ("cheapest
-        // resolves. Parameter resolution is flaky on-device ("cheapest diesel"
+        // ${fuel}") was REMOVED. It competed with the fixed-fuel literal-word
-        // matched, "cheapest unleaded" didn't), which is why the fixed-fuel
+        // shortcuts for the same intent (parameter resolution was already flaky
-        // entries below carry the fuel word as LITERAL phrase text.
+        // on-device), which degraded Siri's NLU ranking and caused the
-        AppShortcut(
+        // hit-and-miss "can't do that, searching in app" fallback. Now Siri
-            intent: CheapestFuelIntent(),
+        // routes on literal fuel words only, and the freed slot keeps us under
-            phrases: [
+        // the 10-shortcut cap. Every phrase carries .applicationName (iOS 26
-                "Ask \(.applicationName) what's the cheapest \(\.$fuel) near me",
+        // metadata-processor requirement) and mirrors how people actually ask.
-            ],
-            shortTitle: "Cheapest Fuel",
-            systemImageName: "fuelpump"
-        )
-
         AppShortcut(
             intent: CheapestFuelIntent(fuel: .e10),
             phrases: [
@@ -509,6 +504,10 @@ struct FuelBoardShortcuts: AppShortcutsProvider {
                 "Ask \(.applicationName) for the cheapest petrol near me",
                 "Find the cheapest petrol near me \(.applicationName)",
                 "Find the cheapest unleaded near me \(.applicationName)",
+                "What's the cheapest unleaded near me \(.applicationName)",
+                "What's the cheapest petrol near me \(.applicationName)",
+                "Cheapest unleaded near me \(.applicationName)",
+                "Where's the cheapest petrol \(.applicationName)",
             ],
             shortTitle: "Cheapest Unleaded",
             systemImageName: "fuelpump"