feat: markdown streaming #3301

Job	Run time
Print commit stats	1m 0s
Build samples	25s
Verify build-browser (windows-latest)	2m 14s
Build	5m 3s
Verify build-browser (macos-26)	1m 11s
Verify build-browser (ubuntu-latest)	49s
Type definitions test	2m 12s
Static code analysis	4m 1s
Unit test	3m 31s
HTML test (2/17)	7m 43s
HTML test (6/17)	7m 51s
HTML test (11/17)	7m 26s
HTML test (3/17)	7m 26s
HTML test (8/17)	7m 11s
HTML test (4/17)	7m 33s
HTML test (17/17)	7m 9s
HTML test (1/17)	7m 6s
HTML test (12/17)	7m 14s
HTML test (9/17)	7m 53s
HTML test (14/17)	8m 7s
HTML test (10/17)	7m 7s
HTML test (5/17)	7m 56s
HTML test (7/17)	6m 44s
HTML test (15/17)	7m 24s
HTML test (16/17)	7m 32s
HTML test (13/17)	7m 20s
Merge test results	28s
Merge test snapshots	5s
	2h 27m 41s

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