coa.17: comprehensive partial-data hardening + DataStore_Characters login scan + Skills strip cap

- Hardening sweep across DataStore_* (softened crash-asserts in Talents/Containers/Quests
  to graceful nil) + Altoholic frames (guarded remaining getter results).
- DataStore_Characters: scan on login (was ghost-gated -> name/level/class never populated;
  the core 'no character data' cause).
- Skills tab: cap inline professions at 6 (+N) so the strip stops overflowing into Cooking.

DataStore_Containers/DataStore_Containers.lua

@@ -678,25 +678,28 @@ local BagTypeStrings = {
 
 local function _GetContainerInfo(character, containerID)
 	local bag = _GetContainer(character, containerID)
+	if type(bag) ~= "table" then return end		-- CoA: unscanned bag on partial-data alt; was an index-nil crash
 	return bag.icon, bag.link, bag.size, bag.freeslots, BagTypeStrings[bag.bagtype]
 end
 
 local function _GetContainerSize(character, containerID)
 	-- containerID can be number or string
-	return character.Containers["Bag" .. containerID].size
+	local bag = character.Containers["Bag" .. containerID]		-- CoA: nil for unscanned bag on partial-data alt
+	return bag and bag.size
 end
 
 local function _GetSlotInfo(bag, slotID)
-	assert(type(bag) == "table")		-- this is the pointer to a bag table, obtained through addon:GetContainer()
-	assert(type(slotID) == "number")
+	-- CoA: partial-data alts can have an unscanned/nil bag pointer (GetContainer returns nil
+	-- for a "BagN" the Containers module never scanned); return empties instead of asserting.
+	if type(bag) ~= "table" or type(slotID) ~= "number" then return end
 
 	-- return itemID, itemLink, itemCount
-	return bag.ids[slotID], bag.links[slotID], bag.counts[slotID] or 1
+	return bag.ids and bag.ids[slotID], bag.links and bag.links[slotID], (bag.counts and bag.counts[slotID]) or 1
 end
 
 local function _GetContainerCooldownInfo(bag, slotID)
-	assert(type(bag) == "table")		-- this is the pointer to a bag table, obtained through addon:GetContainer()
-	assert(type(slotID) == "number")
+	-- CoA: partial-data alts can have an unscanned/nil bag pointer; degrade to nil gracefully.
+	if type(bag) ~= "table" or type(slotID) ~= "number" or type(bag.cooldowns) ~= "table" then return end
 
 	local cd = bag.cooldowns[slotID]
 	if cd then
@@ -868,7 +871,7 @@ end
 local function _GetGuildBankTabItemCount(guild, tabID, searchedID)
 	local count = 0
 	local container = guild.Tabs[tabID]
-	
+	if type(container) ~= "table" or type(container.ids) ~= "table" then return count end		-- CoA: unscanned guild bank tab; was a pairs(nil) crash on item tooltips
 	for slotID, id in pairs(container.ids) do
 		if (id == searchedID) then
 			count = count + (container.counts[slotID] or 1)