perf: add benches for Option, ResultAsync, and Records

[kelsos]

Summary

Round out CodSpeed coverage so every non-trivial namespace has benchmarks tracking it. Previously only `pipe`, `Arrays`, and `Result` were instrumented; this PR adds Option, ResultAsync, and Records.

New bench files

File	Covers
`option/transform.bench.ts`	map / flatMap / filter across some vs none paths; 5-deep flatMap pipelines for both happy and short-circuit
`result-async/transform.bench.ts`	map / flatMap across ok vs err; 5-deep ResultAsync.map chain compared head-to-head with a bare Promise.then chain
`records/transform.bench.ts`	mapValues vs handwritten reduce (small + medium), filter at three selectivity regimes, mapKeys rename
`records/access.bench.ts`	get/getOr hit vs miss, keys/values/entries vs native Object.*

Why these benches

• ResultAsync.map vs Promise.then — direct overhead measurement. If the ResultAsync wrapper grows slower than plain promises for ok-path chains, CodSpeed will flag it.
• Records.mapValues vs handwritten — same for the Records namespace. The handwritten baseline is what users would write without the library.
• get/getOr vs native access — Records wraps native lookups with an Option/hasOwn check. The benches let us see the cost.
• Option.map short-circuit — we want to confirm the none-path stays on the fast path.

No API changes

Purely bench additions. All 224 tests still pass, typecheck clean, TypeDoc regenerates clean.

First baseline

The CodSpeed CI run on this PR establishes the first baseline for these 4 files. Future PRs that touch Option/ResultAsync/Records hot paths will automatically get a per-bench regression comment.

Test plan

• All required CI checks pass
• CodSpeed runs the new benches and posts comparison results (first baseline for the added files)
• No regression vs main on the existing pipe/Arrays/Result benches

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.41%. Comparing base (25bae7a) to head (a4b6d4f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main       #9   +/-   ##
=======================================
  Coverage   88.41%   88.41%           
=======================================
  Files          23       23           
  Lines         397      397           
  Branches       90       90           
=======================================
  Hits          351      351           
  Misses         15       15           
  Partials       31       31           

Flag	Coverage Δ
unittests	88.41% <ø> (ø)

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[codspeed-hq]

Merging this PR will not alter performance

✅ 20 untouched benchmarks
🆕 28 new benchmarks

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
🆕	native property access	N/A	11.9 µs	N/A
🆕	Records.entries	N/A	123 µs	N/A
🆕	Promise.then chain (5 deep)	N/A	21 µs	N/A
🆕	Object.keys native	N/A	24.4 µs	N/A
🆕	ResultAsync.map chain (5 deep, all ok)	N/A	31.8 µs	N/A
🆕	Records.keys	N/A	25.9 µs	N/A
🆕	flatMap 5 deep, ok path	N/A	34.1 µs	N/A
🆕	keep none	N/A	391.6 µs	N/A
🆕	map over err (short-circuit)	N/A	57.8 µs	N/A
🆕	Records.mapValues (medium)	N/A	1.5 ms	N/A
🆕	Records.mapValues (small)	N/A	28.5 µs	N/A
🆕	map over ok	N/A	32.6 µs	N/A
🆕	rename prefix	N/A	2.1 ms	N/A
🆕	handwritten reduce (medium)	N/A	1.2 ms	N/A
🆕	keep all	N/A	1.5 ms	N/A
🆕	flatMap 5 deep, early none	N/A	17.6 µs	N/A
🆕	keep roughly half	N/A	577.8 µs	N/A
🆕	flatMap 5 deep, some path	N/A	18.8 µs	N/A
🆕	filter predicate passes	N/A	14 µs	N/A
🆕	Records.values	N/A	78.2 µs	N/A
...	...	...	...	...

ℹ️ Only the first 20 benchmarks are displayed. Go to the app to view all benchmarks.

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_{Comparing perf/bench-option-recordsasync (a4b6d4f) with main (25bae7a)}