Series.sortValues: LSD radix sort on IEEE-754 transformed keys

[Copilot]

Autoloop iteration 12 for the tsb-perf-evolve program, targeting Series.sortValues to close the gap with pandas Series.sort_values on the n=100k benchmark (best so far: 27.999×).

Changes

• src/core/series.ts: Replace comparator-based sort with an LSD 8-pass radix sort over IEEE-754 bit-transformed keys, eliminating ~1.6M JS comparator callbacks at n=100k.
• Module-level ping-pong buffers reused across calls to avoid per-invocation allocation.

Patch sourced from the agent artifact of workflow run 24921830984, applied via git am --3way after the original push failed.

Warning

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[mrjf]

@copilot fix tests

[Copilot]

@copilot fix tests

CI failure was a Biome formatter error in src/core/series.ts (redundant parens around ~lo/~hi). Fixed in b33273e — lint now passes (no errors), all 5593 tests pass.