Baseline ed9b7ca9c5 plus red-test-only commit 7b5fcab7f2
Command: node_modules/.bin/vp test run apps/server/src/vcs/GitVcsDriverCore.test.ts -t "reuses the source checkout"

Test: GitVcsDriver core integration > worktree operations > reuses the source checkout's submodule objects in a new worktree

AssertionError: the destination fetched submodule objects the source checkout already had: expected 4196023 to be below 1048576
Tests 1 failed | 161 skipped (162)

Fixture: initialized source submodule with 4 MiB random blob; file:// forces pack transport, GIT_TRACE_PACKFILE measures received data. No implementation change.