fix(nix): anchor result* source filter so result_xdr.py is packaged

[RaoulSchaffranek]

Problem

The prebuilt komet-node on k-framework.cachix.org crashes on startup:

ModuleNotFoundError: No module named 'komet_node.result_xdr'

src/komet_node/server.py imports komet_node.result_xdr unconditionally, and the module is committed — but it is missing from the built package on every build (cachix included), so kup install komet-node yields a node that dies before serving any request. Republishing new commits does not help, because the file is dropped again each build.

Root cause

In nix/komet-node-pyk/default.nix, the uv2nix workspace source is filtered through nix-gitignore.gitignoreSourcePure to drop the ./result nix build symlink:

workspaceRoot = lib.cleanSource (nix-gitignore.gitignoreSourcePure [
    ../../.gitignore
    ".github/"
    "result*"      # <-- no leading slash
    ...
  ] ../..);

result* has no leading slash, so by gitignore semantics it matches a path component named result… at any depth — including src/komet_node/result_xdr.py. The file is stripped from the source tree before the wheel is built. (The comment just below this list even warns that source filtering here can make cachix builds diverge from what kup requests.)

Fix

Anchor the pattern to the workspace root so it only matches the top-level build symlinks:

-        "result*"
+        "/result*"

/result* still excludes ./result, ./result-1, … but no longer matches nested source files. result_xdr.py is the only source file whose name starts with result, so this fully resolves the crash.

Verification

• git ls-tree -r HEAD -- src/komet_node/result_xdr.py — file is tracked.
• Before: the built komet-node-env site-packages contains every komet_node module except result_xdr.py.
• After: rebuild and confirm komet-node --host localhost --port <p> starts without the import error (a --help smoke test alone does not catch this — the failing import runs before argument handling).