Add wild_long_scattered MPCC Type 2B audio (scattered, TTS Qwen3)

Add wild_long_scattered MPCC Type 2A audio (dense, TTS Qwen3)

Add wild_long_scattered MPCC audio manifest (TTS Qwen3)

Update GUIO parquets: all 300 source instances (was 271), 1681 variants

Fix: split wild_user_message into 3 explicit informality columns (low/medium/high), remove redundant candidates/informality_tiers JSON columns

Add Long/Scattered (Type 2) wild text parquets — MPCC, GUI Odyssey, EmbodiedBench