build: migrate dev to core24

[clwsgruk]

Summary

• migrate dev from core22 to core24 with compact amd64/arm64 platforms and current Craft variables
• migrate staged runtime packages to Noble, including libcurl4t64
• retain automatic ELF patching and convert the main executable's generated RUNPATH to a transitive RPATH so indirect dependencies stay within the snap/core24 runtime
• launch the real Sublime executable directly, preserving /proc/self/exe, resource discovery, and Sublime's detached self-reexec behavior
• remove the direct-loader wrapper after Focal candidate testing proved that /proc/self/exe resolves to the loader, breaking --detached re-exec and package-resource discovery
• remove proven-unused payload libraries, narrowly exempt runtime-loaded dependency closures from the library linter, and use shared workflow defaults

Verification

• final signed commit: fd2433f9710589487ed3602675c1240c456b5aa2
• clean managed-LXD core24 build: sublime-text_4207_amd64.snap
• SHA-256: 659fc07d21b738cad2aecea5076916e28168f530e853c88a2ea19570caf9a34a
• Snapcraft linters completed with no unhandled warnings
• packed app command is opt/sublime_text/sublime_text
• main interpreter is /snap/core24/current/lib64/ld-linux-x86-64.so.2
• main ELF has transitive RPATH over its own directory, the snap's target library directory, and core24 target library directories
• no process-scoped launcher remains in the packed artifact

GUI testing of this exact dev artifact remains pending; the equivalent candidate design passed a real Focal launch, edit, save, and read-back workflow.

FYI @jnsgruk.

[clwsgruk]

Runtime screenshots

The final dev artifact (sublime-text_4207_amd64.snap, commit fd2433f9710589487ed3602675c1240c456b5aa2) starts successfully and reports build 4207 on all three Ubuntu releases, but it is gated by an Enter License dialog. The dialog offers only Use License; it has no Skip, Continue, or evaluation action. Closing it or pressing Escape terminates the app, so editor interaction cannot be validated without a valid development-build license.

Ubuntu 20.04.6 LTS (Focal)

Ubuntu 22.04.5 LTS (Jammy)

Ubuntu 24.04.4 LTS (Noble)

Noble is a side-by-side capture of the OS/version terminal and license window from the same active Wayland session.