flavor: rewrite rhythm-only lines, fix B2 voice-pass grammar scars, add lines

- Rewrite the LootDropCommon offenders and ~20 other lines that had the
  cadence but no concrete detail (per VOICE_CANON craft rules)
- Fix 7 grammar scars from the third-person-to-first-person B2 pass
  ("...and am not worth picking up" where the subject wasn't TwinBee)
- Replace generic "every RPG" references with specific ones
- Add new lines across ambient/GM/housing/NPC pools, incl. funny-word
  register (kerfuffle, skedaddle, lollygagging) played straight
- New Thom Krooke line follows the pet-first arc

internal/flavor/zone_dragons_lair_flavor.go

@@ -103,7 +103,7 @@ var LoreLinesDragonsLair = []string{
 	"The kobolds are not slaves. The kobolds are clergy. They serve voluntarily, in shifts, with rotation, and the rotation is run by elders who have written sermons. I respect the organization and note the kobold scale-sorcerers are graduates, not recruits.",
 	"The hoard is not random. Each piece is catalogued in Infernax's memory, by location and by year of acquisition. He will know if you take a single coin. I suggest not taking a single coin and instead taking the items the design doc expects you to take — those have been pre-cleared.",
 	"The Dragon Hoard mechanic exists because Infernax does not lose track of his coins. Killing him releases his hold on the catalogue. The 50d10 × 100 coin drop is the entire pile relaxing for the first time in eight centuries. I respect the math and note the rest of the surface economy will too.",
-	"Infernax has had three challengers in the last eight hundred years. Two were heroes. One was a younger dragon. He kept the younger dragon's skull as a paperweight on a treaty desk that has not been used since. I note the paperweight is in the treasury, on the third shelf, and am not worth picking up — picking it up triggers his attention from anywhere on the mountain.",
+	"Infernax has had three challengers in the last eight hundred years. Two were heroes. One was a younger dragon. He kept the younger dragon's skull as a paperweight on a treaty desk that has not been used since. I note the paperweight is in the treasury, on the third shelf, and is not worth picking up — picking it up triggers his attention from anywhere on the mountain.",
 	"The Young Red dragons in the outer chambers are his children. Or his grandchildren. Or unrelated and tolerated. Infernax does not clarify and I have not asked. They are loyal in the way that loyal works for dragons, which is to say: they will fight you, but they will not die for him, and the distinction matters more than it should.",
 	"The kobold scale-sorcerers cast through bloodline. The bloodline traces back to a single clutch laid in the magma chamber three centuries ago. I note the entire sorcerous gene pool of this zone is one extended family and that they all know each other's names.",
 }