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Unify repo naming: drop devcontainer- prefix, publish under devcontainers/ #52

Job	Run time
Actionlint	14s
Hadolint · ralphex-fe/Dockerfile	12s
Hadolint · bun/.devcontainer/Dockerfile	11s
Hadolint · claude-bun/.devcontainer/Dockerfile	12s
Detect changes	5s
Hadolint · hugo-bun-node/.devcontainer/Dockerfile	7s
Hadolint · hugo-bun/.devcontainer/Dockerfile	9s
Build · hugo-bun	1m 17s
Build · bun	40s
Build · claude-bun	46s
Build · ralphex-fe	3m 5s
Build · hugo-bun-node	1m 0s
	7m 58s