Leaving a finished battleground brought the end-of-battleground panel back in the open world,
with a leave button that had nothing left to leave. Two defects, both in how the board outlived
the instance.
`SMSG_BATTLEFIELD_STATUS` is the packet that says the player is out: the active slot's map going
to zero, or that same slot losing `in_progress`. The handler already zeroed the run-time clocks on
exactly those two branches and left the scoreboard standing, so `GetBattlefieldWinner()` kept
answering the finished battleground's winner and stock Lua showed the panel again on the next
score event (`WorldStateFrame.lua:351-355`). TurtleWoW drops its own board on the same signal —
`instanceType == "none"` clears `customData` (`WorldStateFrame.lua:243-247`), which is the only
thing its `GetBattlefieldWinner()` override can fall back from. `BattlefieldQueue` now marks the
exit and the feed zeroes the board with the clocks.
Zeroing the resource alone changed nothing, because the feed could not push an empty one:
`changed = fresh.is_some() && …` withheld a cleared board, and the VM keeps whatever it was last
handed. The clear is pushed as a default board, which answers nil for the winner and fires the
`UPDATE_BATTLEFIELD_SCORE` that lets the frame drop its winner text, timer and button.
`PLAYER_ENTERING_WORLD` is not the lever: the reference fires it once per session beside
`PLAYER_LOGIN`, `PLAYER_LEAVING_WORLD` and `PLAYER_LOGOUT` (`0x490959`, `0x49096a`, `0x490b4d`,
`0x490c2a`), not per teleport.
The world-state test becomes the Lua contract it always was — the panel returns whenever the board
answers a winner — and two app-level tests pin the fix, one per exit packet. Both fail without it.
chairmanpow
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