Add unified-schema Parquet view layer (fixes dataset viewer & load_dataset)

increment v2: +32 sessions (2026-10-08)

increment v2: +65 sessions (2026-10-08)

increment v2: +1 sessions (2026-10-08)

increment v2: +100 sessions (2026-10-08)

increment v2: +96 sessions (2026-10-03)

increment v2: +100 sessions (2026-09-26)

filter: keep tool_calls>=3 (3774/8670 rows) · low-value 1-call sessions moved to legacy-full

legacy: full unfiltered trace archive (pre-filter)

increment v2: +22 sessions (2026-09-21)

increment: full reconcile +1126 unique sessions (1230 files, dedup by complete sid)

increment: +5 sessions (truly-missing backfill)

increment: +80 sessions (manual backfill oldest-first)

increment v2: +45 sessions (2026-09-21)

increment v2: +45 sessions (2026-09-21)

increment v2: +37 sessions (2026-09-21)

increment v2: +57 sessions (2026-09-21)

increment v2: +23 sessions (2026-09-21)

increment v2: +148 sessions (2026-09-19)

increment v2: +88 sessions (2026-09-19)

increment v2: +9 sessions (2026-09-19)

increment v2: +39 sessions (2026-09-16)

increment v2: +96 sessions (2026-09-15)

increment: +237 sessions (2026-09-12)

increment: +50 sessions (2026-09-10..12) + dedupe 192 dup rows (6936->6794 unique)

v2 increment 1: S2 prefix-cache surgery before/after traces (33 calls, weighted 78.5%, steady-state 96.9%)

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