Merge pull request #51 from Coding-Dev-Tools/codex/railway-ready-final #313

Job	Run time
browser accessibility smoke	1m 30s
docker smoke — path gate	5s
build + install wheel	57s
core floor (numpy-only, Python 3.9)	39s
test + lint (full offline stack) (3.10)	2m 33s
test + lint (full offline stack) (3.12)	2m 38s
test + lint (full offline stack) (3.11)	2m 21s
docker build + health smoke	2m 3s
	12m 46s

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