WIP: in-flight combat/expedition/flavor changes

Bundle of uncommitted working-tree edits across combat engine, expedition
cycle, flavor pools, and TwinBee/zone narration. Includes new files:
combat_debug.go, dnd_boss_consumables.go, dnd_dex_floor.go, plus
CHANGES_24H.md and REBALANCE_NOTES.md scratch notes.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

internal/flavor/zone_crypt_valdris_flavor.go

@@ -78,7 +78,7 @@ var ValdrisSignatureCallouts = func() []string {
 
 var LoreLinesCrypt = []string{
 	"Valdris was a scholar. Then he was an aspirant. Then he was a failed aspirant. The failure is the part that mattered — the lich ritual completed but completed wrong, and the wrongness has had three centuries to compound. TwinBee has read the contemporaneous accounts and finds the original scholar likable, which makes the rest harder.",
-	"The phylactery shard you'll find here is one of seven. The other six are not in this crypt. TwinBee will not say where they are because TwinBee doesn't fully know, and the partial knowledge TwinBee has is the kind that gets people followed by things that prefer not to be looked for.",
+	"The phylactery shard you'll find here is one of seven. The other six are not in this crypt. TwinBee will not say where they are, because it doesn't fully know, and the partial knowledge it has is the kind that gets people followed by things that prefer not to be looked for.",
 	"The candles in the crypt do not consume wax. They do not consume time, either, in the strict sense. They were lit on the day Valdris was interred and they have been lit ever since. TwinBee respects this kind of consistency in a way that does not extend to approval.",
 	"The skeletons here are not all enemies. Some of them are former students, posed in the alcoves where they died, marked with the texts they were translating. TwinBee suggests you don't disturb the marked ones unless you mean to. Some lessons end and some lessons keep going.",
 	"The iron gate at the entrance has been opened from the inside three times in the last decade, and from the outside zero times. TwinBee finds the asymmetry instructive. It also finds the pattern instructive: you are walking into the open door, not opening it.",