Remove orphaned internship2026 gitlink blocking Actions build checkout

[Copilot]

The build GitHub Actions job failed during recursive submodule checkout because the repository tracked internship2026 as a submodule gitlink without a corresponding URL mapping in .gitmodules. This PR removes that orphaned gitlink so checkout can complete.

• Root cause

  • Repository index contained a mode 160000 entry (internship2026) with no valid submodule config.
  • actions/checkout with submodules: recursive invoked git submodule update --init --recursive, which failed with:
    • fatal: No url found for submodule path 'internship2026' in .gitmodules

• Change applied

  • Removed the stale gitlink entry from version control:
    • deleted tracked path: internship2026 (gitlink/submodule pointer)

• Why this is the minimal fix

  • Keeps workflow behavior unchanged (submodules: recursive still supported for real submodules).
  • Eliminates only the invalid submodule metadata causing checkout failure.

diff --git a/internship2026 b/internship2026
deleted file mode 160000
index 9cff5b4..0000000
--- a/internship2026
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 9cff5b4bee125c5a6eb41b3bb8ffc2abd9446b48

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