[wangyinz]

Closes #797.

Canonicalizes GeoLab's MongoDB reset root and target before any destructive operation. Reset now rejects empty, relative, root, home, workspace, database-root, file, traversal, symlink-escape, and prefix-collision targets, and only removes a canonical nested database directory.

Validation:

• contract tests: 11 passed; exact master baseline: 10 failed, 1 passed
• contract plus adjacent sharding regression: 16 passed
• sh -n, bash -n, Black, py_compile, and git diff --check: passed

Independent agent review: PASS with no code changes. The review additionally verified that all rejected cases exit before rm or directory creation and leave the filesystem snapshot unchanged.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.34%. Comparing base (f99649a) to head (b98f839).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #939   +/-   ##
=======================================
  Coverage   74.34%   74.34%           
=======================================
  Files         183      183           
  Lines       36506    36506           
  Branches     2540     2540           
=======================================
  Hits        27141    27141           
  Misses       8455     8455           
  Partials      910      910           

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