Document the invmon "float" field

[rodarvus]

Summary

Spellups["GL"]["float"] is updated by the invmon handler in SpellupRecast/Hadar_Spellups.xml and consumed by OnPluginBroadcast when auto-aura fires, but the variable name doesn't say what role it plays. This adds a four-line comment above the function describing the round-trip: invmon remembers whatever non-aura item the user normally wears in the floating slot (loc 27) so the broadcast handler can re-wear it after the aura swap ("wear "..Spellups["GL"]["float"]).

Comment-only; no behavior change.

Before

function invmon(nm,ln,wc)
    if tonumber(wc.action) == 1 and tonumber(wc.loc) == 27 then
        if tonumber(Spellups["GL"]["auranumber"]) ~= tonumber(wc.id) then
            Spellups["GL"]["float"] = tonumber(wc.id)
        end
    end
end

After

-- Tracks the non-aura item worn in the floating slot (loc 27).
-- When auto-aura swaps the user's aura into slot 27 to cast sanctuary,
-- Spellups["GL"]["float"] remembers what was there before so OnPluginBroadcast
-- can re-wear it after the cast (see "wear "..Spellups["GL"]["float"]).
function invmon(nm,ln,wc)
    if tonumber(wc.action) == 1 and tonumber(wc.loc) == 27 then
        if tonumber(Spellups["GL"]["auranumber"]) ~= tonumber(wc.id) then
            Spellups["GL"]["float"] = tonumber(wc.id)
        end
    end
end

Test plan

• Comment-only change. No behavior is altered.

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