move collect_text onto Node; include details in CONTRIBUTING.

[kivikakk]

No description provided.

[codspeed-hq]

Merging this PR will not alter performance

✅ 1 untouched benchmark

---

_{Comparing push-otmvmmmlomyy (6abbc32) with main (9a3d311)}

[github-actions]

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
./bench.sh ./comrak-55b7baa	113.1 ± 1.5	111.1	116.2	1.98 ± 0.05
./bench.sh ./comrak-main	112.8 ± 1.2	110.6	116.1	1.97 ± 0.05
./bench.sh ./pulldown-cmark	57.2 ± 1.4	55.9	64.9	1.00
./bench.sh ./cmark-gfm	86.3 ± 7.2	81.3	104.4	1.51 ± 0.13
./bench.sh ./markdown-it	261.4 ± 2.7	257.5	267.4	4.57 ± 0.12

Run on Mon Jul 6 11:13:43 UTC 2026