test: Add full unit coverage for MongoTransform

[dblythy]

Issue

src/Adapters/Storage/Mongo/MongoTransform.js sat at 88.61% coverage (74 uncovered lines).

Approach

Brings it to 100%, split into two parts:

Real tests for the reachable code (63 lines) - added unit tests to spec/MongoTransform.spec.js, which already unit-tests the exported transform functions directly. Covers the previously-missed paths across every export: built-in key mapping (sessionToken/lastUsed/timesUsed), date-field coercion in transformWhere and parseObjectToMongoObjectForCreate, transformConstraint error + geo/$maxDistance branches, transformUpdate operator validation, and mongoObjectToParseObject atom/pointer/Polygon edge cases.

istanbul ignore for the genuinely unreachable code (11 lines, no runtime change). transformInteriorAtom never returns the CannotTransform sentinel, so the array/__op tail of transformInteriorValue is dead - which in turn makes transformUpdateOperator's flatten=true branches unreachable (their only caller is that dead tail). isAllValuesRegexOrNone's empty guard is short-circuited by its only caller (isAnyValueRegex). These are marked with ignore if/ignore next and a reason, leaving the covered else branches still tracked. Verified locally: MongoTransform.js reports 100% (639/639) in the full suite.

Tasks

• Add tests

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 770c5259-f47b-4405-925c-76fc4ab87211

📥 Commits

Reviewing files that changed from the base of the PR and between 7e9d53a and 3fd373c.

📒 Files selected for processing (2)

• spec/MongoTransform.spec.js
• src/Adapters/Storage/Mongo/MongoTransform.js

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.09%. Comparing base (cce91e5) to head (3fd373c).
⚠️ Report is 1 commits behind head on alpha.

Additional details and impacted files

@@            Coverage Diff             @@
##            alpha   #10560      +/-   ##
==========================================
+ Coverage   92.66%   93.09%   +0.43%     
==========================================
  Files         193      193              
  Lines       16981    16970      -11     
  Branches      248      248              
==========================================
+ Hits        15736    15799      +63     
+ Misses       1224     1150      -74     
  Partials       21       21              

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