feat(agentsh): add agentsh execution-layer security Dev Container Feature #35

Job	Run time
test-global	40s
agentsh-release-architecture (linux/arm64)	4s
shellcheck-agentsh	6s
agentsh-rest-auth	27s
agentsh-release-architecture (linux/amd64)	5s
test-autogenerated (node-dev-tools, mcr.microsoft.com/devcontainers/javascript-node:22)	2m 3s
test-autogenerated (modern-cli-tools, mcr.microsoft.com/devcontainers/base:ubuntu)	56s
test-autogenerated (python-tools, mcr.microsoft.com/devcontainers/python:latest)	2m 16s
test-autogenerated (github-actions-tools, mcr.microsoft.com/devcontainers/base:ubuntu)	32s
test-scenarios (modern-cli-tools)	56s
agentsh-shim-integration	41s
test-autogenerated (rust-dev-tools, mcr.microsoft.com/devcontainers/rust:latest)	9m 34s
test-autogenerated (ai-clis, mcr.microsoft.com/devcontainers/javascript-node:22)	1m 2s
test-scenarios (node-dev-tools)	1m 1s
test-scenarios (rust-dev-tools)	2m 48s
test-scenarios (agentsh)	1m 37s
test-scenarios (ai-clis)	1m 34s
test-scenarios (python-tools)	1m 21s
test-scenarios (github-actions-tools)	29s
	28m 12s

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