feat(pipeline): WSWP sound swap rules catalog (141st open format)

Novel format covering a need vanilla WoW lacked entirely:
priority-based sound substitution. Blizzard had no formal
mechanism for swapping a stock SoundEntry for a custom
replacement conditionally on zone/class/race/gender; the
closest equivalents were patch-level SoundEntries.dbc edits
with no condition support. Each WSWP entry binds one
(originalSoundId, condition) trigger to a replacementSoundId,
a priority index for tie-breaking (higher wins), and an
optional gain adjustment in 0.1 dB units (range ±30 dB
practical mixer limit).

Three presets covering common substitution scenarios:
  --gen-swp-bosses  3 raid-boss zone-only swaps (Onyxia roar
                    in Onyxia's Lair / Ragnaros emerge in
                    Molten Core +2dB / Nefarian shout in BWL).
                    Priority 100 — beats global rules
  --gen-swp-race    3 race-conditional voice swaps (BloodElf
                    priest / Tauren shaman / Undead warlock
                    cast voices). Priority 50
  --gen-swp-ui      3 always-on UI sound swaps (level-up /
                    quest-complete / mount-up) at priority
                    10 with +3dB gain (boss/race overrides
                    win the priority fight)

Validator catches: id+name+original+replacement required,
conditionKind 0..4, no duplicate ruleIds, no self-replacement
(orig==repl is a no-op slot), non-Always kinds require non-
zero conditionValue (kind without target = matches everything,
duplicating Always semantics). CRITICAL: no duplicate
(originalSoundId, conditionKind, conditionValue) trigger
triple — runtime would have two rules for the same trigger
without a tie-breaker. Warns on priorityIndex=0 (rule never
wins), |gainAdjustDb_x10| > 300 (clip risk), Always condition
with non-zero conditionValue (dead data ignored at runtime),
and same-priority within same originalSoundId (tie-break
undefined when both rules' conditions match simultaneously).

Format count 140 -> 141. CLI flag count 1463 -> 1470.

tools/editor/cli_arg_required.cpp

@@ -431,6 +431,8 @@ const char* const kArgRequired[] = {
     "--gen-brd-av", "--gen-brd-wsg", "--gen-brd-ab",
     "--info-wbrd", "--validate-wbrd",
     "--export-wbrd-json", "--import-wbrd-json",
+    "--gen-swp-bosses", "--gen-swp-race", "--gen-swp-ui",
+    "--info-wswp", "--validate-wswp",
     "--gen-weather-temperate", "--gen-weather-arctic",
     "--gen-weather-desert", "--gen-weather-stormy",
     "--gen-zone-atmosphere",