Add physical parameters to OutputSink

[connortsui20]

Summary

• Tracking Issue: Tracking Issue: Define the RowFn API #9129

This adds a physical-parameters channel to OutputSink and stacks on #9581, completing runtime logical and physical output selection separately.

Changes

OutputSink::Params now flows through sink visits, validation, and allocation. For example, FixedSizeListSink (new) uses an options-derived runtime width with safe complete-row initialization.

API Changes

The unstable row-function API now requires sink parameters for visit_into and visit_prepared_into; sinks that need none just use ().

[codspeed-hq]

Merging this PR will improve performance by 13.04%

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

⚡ 1 improved benchmark
✅ 1980 untouched benchmarks
⏩ 54 skipped benchmarks¹

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	WallTime	words_gather_scalar_avx2[65536]	9.3 µs	8.3 µs	+13.04%

Tip

Curious why this is faster? Comment @codspeedbot explain why this is faster on this PR, or directly use the CodSpeed MCP with your agent.

---

_{Comparing ct/sink-params (f50516b) with claude/generic-output-sink-etzm2l (f3ca34d)}

Footnotes

1. 54 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[joseph-isaacs]

would be nice to not have new ()?

[connortsui20]

yeah it would be nice, but don't really want to add more API surface just for this (and it depends on the output sink you choose at the end so not all of them are like this)