[repo-assist] test: add unit coverage for isOutermostInSameOperatorChain root-node branch

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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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