docs: audit and fix standards docs inconsistencies (v1.2)

AssetFolderSpec.md:
- §8.1: Enemies_{Region} → Enemies (match AddressableRules.cs single group)
- §8.4: fix old menu paths (Tools/Verification → Addressables)
- §10.3: fix Skill SO path (Data/Player/Skills → Data/Progression/Skills)
- §10.4: Charm workflow — remove 'bypass editor tools' recommendation
- §3.2: add SPL_ prefix for SpellSO
- Bump to v1.2

AddressablesLabelSpec.md:
- §6 step 7: fix old Verification menu path
- §7.2/7.3/7.4: unify menu notation (→ to /) and fix old Tools/Verification paths
- Bump to v1.2

AddressKeys.cs:
- Remove duplicate <summary> XML doc comment in Labels class

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Assets/_Game/Scenes/Testings/TestRoomA.unity

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