feat: add prettify error utility

[schplitt]

No description provided.

[github-actions]

📊 Benchmark Results

Performance comparison of Narro vs Zod, Valibot, and ArkType

Complex Backend

complex backend: valid parse

Library	ops/sec	Mean (ms)	vs Fastest	vs Main
zod valid	285,985	3.4967	fastest	+1.9%
valibot valid	194,513	5.1411	1.47x slower (47.0%)	-0.8%
arktype valid	175,069	5.7120	1.63x slower (63.4%)	+1.7%
narro inline valid	48,421	20.6522	5.91x slower (490.6%)	+2.2%
narro async valid	38,258	26.1382	7.48x slower (647.5%)	+2.4%
narro inline unbuild valid	10,079	99.2125	28.37x slower (2737.3%)	+0.5%
narro unbuild async valid	1,582	632.1711	180.79x slower (17979.2%)	🟢 +6.6%

complex backend: invalid parse

Library	ops/sec	Mean (ms)	vs Fastest	vs Main
valibot invalid	167,079	5.9852	fastest	🔴 -6.9%
arktype invalid	111,419	8.9752	1.50x slower (50.0%)	-0.4%
narro inline invalid	46,299	21.5989	3.61x slower (260.9%)	-2.9%
narro async invalid	41,131	24.3124	4.06x slower (306.2%)	+0.6%
zod invalid	29,128	34.3312	5.74x slower (473.6%)	🟢 +5.3%
narro inline unbuild invalid	11,153	89.6608	14.98x slower (1398.0%)	🟢 +13.2%
narro unbuild async invalid	1,703	587.3098	98.13x slower (9712.7%)	-2.0%

Complex Frontend

complex frontend: valid parse

Library	ops/sec	Mean (ms)	vs Fastest	vs Main
zod valid	321,610	3.1094	fastest	+2.9%
valibot valid	247,131	4.0464	1.30x slower (30.1%)	+3.6%
narro inline valid	64,330	15.5447	5.00x slower (399.9%)	+1.9%
arktype valid	57,464	17.4023	5.60x slower (459.7%)	-2.1%
narro async valid	51,385	19.4609	6.26x slower (525.9%)	+2.1%
narro inline unbuild valid	11,476	87.1407	28.03x slower (2702.5%)	-2.2%
narro async unbuild valid	1,627	614.4587	197.62x slower (19661.6%)	-1.6%

complex frontend: invalid parse

Library	ops/sec	Mean (ms)	vs Fastest	vs Main
valibot invalid	118,026	8.4727	fastest	+2.9%
narro inline invalid	48,906	20.4475	2.41x slower (141.3%)	🟢 +6.7%
narro async invalid	42,659	23.4415	2.77x slower (176.7%)	+0.9%
arktype invalid	18,014	55.5118	6.55x slower (555.2%)	+0.7%
zod invalid	14,846	67.3589	7.95x slower (695.0%)	+4.2%
narro inline unbuild invalid	10,439	95.7976	11.31x slower (1030.7%)	🔴 -8.6%
narro unbuild async invalid	1,770	564.9824	66.68x slower (6568.3%)	🟢 +5.1%

---

💡 Higher ops/sec is better. Lower mean time is better.
🔵 vs Main: Shows performance change from main branch. 🟢 >5% faster, 🔴 >5% slower.