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).

CHANGELOG.md

@@ -3,6 +3,17 @@
 All notable changes to MetaHunt will be documented in this file.
 
 
+## [2.0.0] - Unreleased
+
+### Changed
+
+- **Settings storage tidied into one clean layout**: The settings MetaHunt inherited from the older stand-alone addons it now replaces (Feed-O-Matic, ZHunter/zButtons, SmartAmmo, and the quest/anti-daze/auto-strip/minimap helpers) used to be scattered across many separate saved entries, several of them duplicated on disk. MetaHunt now keeps everything in one organised place, grouped per module. The clean-up runs automatically and once, the first time you log in after updating: all of your existing settings and layouts are carried over unchanged — nothing is reset — and the old duplicate copies are removed so your saved-variables file stays small and consistent.
+
+### Fixed
+
+- **Pets — duplicate and phantom entries in your pet collection**: MetaHunt could record the same tamed pet more than once — a fresh copy appeared after you logged out and back in, or after your pet leveled up — and a few very early pets you had long since dismissed lingered as though they were still with you. MetaHunt now recognises each pet reliably from one session to the next (and as it levels), automatically merges the duplicate entries it had already created while keeping the correct taming details (where, and at what level, you tamed each one), and tidies the leftover phantom pets away into your pet history. Your full taming history is preserved — nothing is deleted.
+
+
 ## [1.5.2] - 2026-09-08
 
 Res on Octowow server.