refactor(git): split engine into core subpackage

test/git/cmd_test.lua

@@ -194,7 +194,7 @@ t.test("complete add returns only unstaged/untracked paths", function()
     local dir = make_repo({ tracked = "x" })
     t.write(dir, "tracked", "modified")
     t.write(dir, "newfile", "new")
-    local r = assert(require("git.repo").resolve(dir))
+    local r = assert(require("git.core.repo").resolve(dir))
     r:refresh()
     t.wait_for(function()
         return r.status and #vim.tbl_keys(r.status.entries) > 0
@@ -309,7 +309,7 @@ t.test(":G show <CR> on + line opens the blob URI", function()
     t.write(dir, "a", "second\n")
     h.git(dir, "add", "a")
     h.git(dir, "commit", "-q", "-m", "second")
-    assert(require("git.repo").resolve(dir))
+    assert(require("git.core.repo").resolve(dir))
     local blob = h.git(dir, "rev-parse", "HEAD:a").stdout
 
     cmd.run({ "show", "HEAD" })
@@ -367,7 +367,7 @@ t.test("<CR> still dispatches after navigating away and back", function()
 
     -- Open the HEAD commit object buffer. Its cat-file output includes a
     -- "parent <sha>" line we can navigate from.
-    local r = assert(require("git.repo").resolve(dir))
+    local r = assert(require("git.core.repo").resolve(dir))
     require("git.object").open(r, "HEAD", { split = false })
     local first_obj_buf = vim.api.nvim_get_current_buf()
     local first_obj_win = vim.api.nvim_get_current_win()
@@ -397,7 +397,7 @@ end)
 t.test(":G diff <CR> on + line falls back to worktree file", function()
     local dir = make_repo({ a = "v1\n" })
     t.write(dir, "a", "v2\n")
-    assert(require("git.repo").resolve(dir))
+    assert(require("git.core.repo").resolve(dir))
 
     cmd.run({ "diff" })
     wait_buf_populated("%[Git diff%]")