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Stop Inertia payloads rendering as pages, and 500ing on client-side visits #313

Job	Run time
JS lint & format	18s
Python tests	3m 30s
E2E smoke (Playwright)	1m 30s
JS tests (Vitest)	26s
JS typecheck	41s
Python typecheck	19s
Perf guards (Playwright)	2m 2s
File size (300-line cap)	15s
Package build (release dry-run)	13s
JS build (Vite)	43s
Python lint & format	17s
PR checks	3s
	10m 17s