test: add unit coverage for isOutermostInSameOperatorChain root-node branch

[github-actions]

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Summary

Adds direct unit tests for the shared isOutermostInSameOperatorChain() helper in complexityHelpers.ts (extracted in a previous Repo Assist PR and used by all 6 language analyzers). The one previously-untested branch — the root-of-tree case where node.parent is null — had 0 branch coverage hits (branch coverage for this file: 85.71%).

Changes

• New describe("complexityHelpers: isOutermostInSameOperatorChain") block in src/unit/unit.test.ts using lightweight mock nodes (only .parent/.type are read by the function, so a real tree-sitter parse tree is not needed).
• Covers: no-parent (root) case, same-kind/same-operator inner node, same-kind/different-operator, different-parent-type, and the array-of-sameKindTypes form.

Test Status

• npm run compile: passes
• npm run lint: passes
• npm run test:unit: 241 tests passing (up from 236)
• Coverage: complexityHelpers.ts branch coverage 85.71% -> 100%; overall repo coverage 98.71/94.83/99.1/98.71 (thresholds 95/88/97/95)
• npm test (vscode-test): not run in this sandbox (no network access to download the VS Code test binary) — expected sandbox limitation, should be verified by CI

This is a low-risk, test-only change (Task 9 — Testing Improvements).

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.11%. Comparing base (e759b8c) to head (a2e22f3).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #577      +/-   ##
==========================================
+ Coverage   98.04%   98.11%   +0.07%     
==========================================
  Files          12       12              
  Lines        3931     3931              
  Branches      450      451       +1     
==========================================
+ Hits         3854     3857       +3     
+ Misses         77       74       -3     

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[Copilot]

🟢 Approval recommended

The test-only changes accurately cover the helper’s branching behavior without affecting production code.

Pull request overview

Adds focused unit coverage for the shared operator-chain helper.

Changes:

• Tests root-node, parent-type, operator, and array-type branches.
• Uses lightweight typed syntax-node mocks.

File summaries

File	Description
src/unit/unit.test.ts	Adds five helper unit tests.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 0
• Review effort level: Balanced

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