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Split near-cap Python files by responsibility (#522, Python half) #542

Job	Run time
JS lint & format	25s
JS tests (Vitest)	1m 0s
Python tests	14m 30s
Docs site build	31s
JS build (Vite)	51s
Python lint & format	20s
JS typecheck	50s
Package build (release dry-run)	20s
E2E smoke (Playwright)	6m 28s
Python typecheck	19s
File size (300-line cap)	13s
Migrations round trip (Postgres)	37s
Perf guards (Playwright)	1m 57s
Module diagnostics (make doctor)	17s
PR checks	3s
	28m 41s