Unify SavedVariables into two clean roots with one-time migration

Collapse all legacy/scattered SavedVariables from absorbed standalone
addons (FeedOMatic, ZHunter/zButtons, SmartAmmo, AutoQuest, AntiDaze,
AutoStrip, MinimapButton) into two persisted globals with clean per-module
nesting under .modules.<id>.

Migration engine (api/savedvariables.lua):
- MTH_SV_EnsureSchema() with schemaVersion gate, idempotent + non-destructive
- Per-module migrators map old locations -> canonical nested stores
- Driven by an ADDON_LOADED("MetaHunt") handler so it runs only AFTER WoW
  loads the real SavedVariables (fixes announce-every-session bug that ran
  the migration on empty pre-load defaults)
- One-time player-facing chat announce, gated on real legacy data present

Framework/config:
- core-framework InitSavedVariables no longer runs migration at file-load;
  unconditionally strips account-root module aliases
- config.lua stops re-creating root[module] aliases (was duplicating data
  onto disk); canonical store stays under .modules.<id>

Modules:
- feedomatic: bind FOM_* globals as runtime aliases into nested store,
  drop persisted duplicates and .legacy blob
- zhunter: ZHunterMod_Saved re-pointed at .modules.zhunter
- smartammo/autoquest/antidaze/autostrip/minimapbutton read nested store

TOC trimmed to MTH_SavedVariables + MTH_CharSavedVariables only.
Profiles unchanged (already snapshot/apply the nested .modules structure).

Also includes pet-scan refinements: canonical pet key derivation and
level-independent pet signature (schema v3).

modules/smartammo/engine.lua

@@ -1,7 +1,3 @@
-local function MTHSmartAmmo_GetSaved()
-	return MTH_SA_GetSavedTable("MTHSmartAmmo")
-end
-
 local function MTHSmartAmmo_GetModuleStore()
 	if MTH and MTH.GetModuleCharSavedVariables then
 		return MTH:GetModuleCharSavedVariables("smartammo")
@@ -9,40 +5,43 @@ local function MTHSmartAmmo_GetModuleStore()
 	return nil
 end
 
-local function MTHSmartAmmo_IsSmartEnabled()
+-- Single source of truth: moduleStore.settings.{smartEnabled,reloadEnabled,weaponSwapEnabled}
+local function MTHSmartAmmo_GetSettings()
 	local moduleStore = MTHSmartAmmo_GetModuleStore()
-	if type(moduleStore) == "table" and moduleStore.smartEnabled ~= nil then
-		return moduleStore.smartEnabled and true or false
+	if type(moduleStore) ~= "table" then
+		return nil
 	end
-	local saved = MTHSmartAmmo_GetSaved()
-	if saved["enabled"] == nil then
-		return true
+	if type(moduleStore.settings) ~= "table" then
+		moduleStore.settings = {}
 	end
-	return saved["enabled"] and true or false
+	return moduleStore.settings
+end
+
+local function MTHSmartAmmo_ReadFlag(key)
+	local settings = MTHSmartAmmo_GetSettings()
+	if settings and settings[key] ~= nil then
+		return settings[key] and true or false
+	end
+	return true -- default enabled
+end
+
+local function MTHSmartAmmo_WriteFlag(key, enabled)
+	local settings = MTHSmartAmmo_GetSettings()
+	if settings then
+		settings[key] = enabled and true or false
+	end
+end
+
+local function MTHSmartAmmo_IsSmartEnabled()
+	return MTHSmartAmmo_ReadFlag("smartEnabled")
 end
 
 local function MTHSmartAmmo_IsReloadEnabled()
-	local moduleStore = MTHSmartAmmo_GetModuleStore()
-	if type(moduleStore) == "table" and moduleStore.reloadEnabled ~= nil then
-		return moduleStore.reloadEnabled and true or false
-	end
-	local saved = MTHSmartAmmo_GetSaved()
-	if saved["reload"] == nil then
-		return true
-	end
-	return saved["reload"] and true or false
+	return MTHSmartAmmo_ReadFlag("reloadEnabled")
 end
 
 local function MTHSmartAmmo_IsWeaponSwapEnabled()
-	local moduleStore = MTHSmartAmmo_GetModuleStore()
-	if type(moduleStore) == "table" and moduleStore.weaponSwapEnabled ~= nil then
-		return moduleStore.weaponSwapEnabled and true or false
-	end
-	local saved = MTHSmartAmmo_GetSaved()
-	if saved["weaponSwap"] == nil then
-		return true
-	end
-	return saved["weaponSwap"] and true or false
+	return MTHSmartAmmo_ReadFlag("weaponSwapEnabled")
 end
 
 local MTHSmartAmmo_InitializeHooks
@@ -58,9 +57,7 @@ local MTH_SA_SPELL_EVENTS = {
 }
 
 function MTHSmartAmmo_SetSmartEnabled(enabled, silent)
-	local saved = MTHSmartAmmo_GetSaved()
 	if enabled then
-		saved["enabled"] = 1
 		local evFrame = getglobal("MTH_SA_EventFrame")
 		if evFrame then
 			for _, ev in ipairs(MTH_SA_SPELL_EVENTS) do
@@ -77,7 +74,6 @@ function MTHSmartAmmo_SetSmartEnabled(enabled, silent)
 			MTH_SA_Print("Smart Ammo Enabled.")
 		end
 	else
-		saved["enabled"] = false
 		local evFrame = getglobal("MTH_SA_EventFrame")
 		if evFrame then
 			for _, ev in ipairs(MTH_SA_SPELL_EVENTS) do
@@ -89,10 +85,7 @@ function MTHSmartAmmo_SetSmartEnabled(enabled, silent)
 		end
 	end
 
-	local moduleStore = MTHSmartAmmo_GetModuleStore()
-	if type(moduleStore) == "table" then
-		moduleStore.smartEnabled = enabled and true or false
-	end
+	MTHSmartAmmo_WriteFlag("smartEnabled", enabled and true or false)
 end
 
 function MTHSmartAmmo_GetSmartEnabled()
@@ -100,16 +93,7 @@ function MTHSmartAmmo_GetSmartEnabled()
 end
 
 function MTHSmartAmmo_SetReloadEnabled(enabled, silent)
-	local saved = MTHSmartAmmo_GetSaved()
-	if enabled then
-		saved["reload"] = 1
-	else
-		saved["reload"] = false
-	end
-	local moduleStore = MTHSmartAmmo_GetModuleStore()
-	if type(moduleStore) == "table" then
-		moduleStore.reloadEnabled = enabled and true or false
-	end
+	MTHSmartAmmo_WriteFlag("reloadEnabled", enabled and true or false)
 	if not silent and DEFAULT_CHAT_FRAME then
 		MTH_SA_Print("Smart Ammo reload fallback " .. (enabled and "Enabled." or "Disabled."))
 	end
@@ -120,16 +104,7 @@ function MTHSmartAmmo_GetReloadEnabled()
 end
 
 function MTHSmartAmmo_SetWeaponSwapEnabled(enabled, silent)
-	local saved = MTHSmartAmmo_GetSaved()
-	if enabled then
-		saved["weaponSwap"] = 1
-	else
-		saved["weaponSwap"] = false
-	end
-	local moduleStore = MTHSmartAmmo_GetModuleStore()
-	if type(moduleStore) == "table" then
-		moduleStore.weaponSwapEnabled = enabled and true or false
-	end
+	MTHSmartAmmo_WriteFlag("weaponSwapEnabled", enabled and true or false)
 	if not silent and DEFAULT_CHAT_FRAME then
 		MTH_SA_Print("Smart Ammo weapon-swap auto-equip " .. (enabled and "Enabled." or "Disabled."))
 	end
@@ -807,15 +782,15 @@ SlashCmdList["MTHSmartAmmo"] = function(msg)
 		return
 	end
 
-	local saved = MTHSmartAmmo_GetSaved()
+	local smartEnabled = MTHSmartAmmo_GetSmartEnabled()
 
 	if msg == "status" then
 		local castHook, actionHook, byNameHook = MTHSmartAmmo_AreHooksInstalled()
-		MTH_SA_Print("Smart Ammo status: smart=" .. tostring(saved["enabled"] and true or false) .. ", module=" .. tostring(MTH_SA_IsModuleEnabled()) .. ", hooks=" .. tostring(castHook) .. "/" .. tostring(actionHook) .. "/" .. tostring(byNameHook))
+		MTH_SA_Print("Smart Ammo status: smart=" .. tostring(smartEnabled) .. ", module=" .. tostring(MTH_SA_IsModuleEnabled()) .. ", hooks=" .. tostring(castHook) .. "/" .. tostring(actionHook) .. "/" .. tostring(byNameHook))
 		return
 	end
-	
-	if saved["enabled"] then
+
+	if smartEnabled then
 		MTHSmartAmmo_SetSmartEnabled(nil)
 	else
 		MTHSmartAmmo_SetSmartEnabled(1)