PyHPC CSCS Summer School 2026 event support

[robobryce]

Signed replacement for #215, based directly on current main and containing the full reviewed event change as one verified commit. Includes the follow-up fixes from #218.

Key properties:

• GitHub reports commit 87547a3 as verified; this PR contains exactly one commit beyond main
• PyHPC images are built natively for AMD64 and ARM64 in GitHub CI
• Daint consumes published images; automatic Podman test/start/shell paths cannot build
• deployment EDFs are published to the generated branch instead of committed
• nsys/ncu wrappers have two execution branches and Streamer startup uses its native idempotent setup

Live Daint validation on GH200 using the CI-built ARM64 image:

• 11/11 package tests passed
• 14/14 notebooks passed
• direct nsys profile/export passed
• direct ncu profile/import passed
• rootless Podman no-build package test passed 11/11

Local validation passed for Bash/Python/Ruff/YAML/Actions linting, all Compose files and Podman transforms, LFS, an 8-tutorial workflow matrix, generated EDFs, and diff checks.

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[brycelelbach]

We need instructions on how to deploy the container for 10 hours and connect to the JupyterLab, nsys, and ncu services from a web browser. Those instructions should mount the checked out repo so students solutions will persist.

I have a feeling we'll need to do SSH port forwarding. Will that cause issues with the responsiveness/interactivity of the nsys/ncu services that use WebRTC?

[robobryce]

Closing in favor of #218, which targets the event branch as requested.