docs: annotate unreachable guards with c8 ignore for coverage consistency

[github-actions]

Summary

While investigating Tasks 4/8/9 (Engineering Investments, Performance, Testing) this run, an explore pass found no new engineering, performance, or coverage-gap work (all remaining uncovered lines are already documented /* c8 ignore */ defensive fallbacks, and CI actions/dependencies are already at latest or covered by open Dependabot PRs #501/#455/#546). Per the fallback table, this run substitutes Task 5 (Coding Improvements).

Change

Two defensive guards were unreachable-by-grammar but missing the /* c8 ignore */ annotation that equivalent guards elsewhere in the codebase already carry:

• jsLikeAnalyzer.ts getOperator(): !operatorNode guard — sibling csharpAnalyzer.getBinaryOperator has the same guard with /* c8 ignore next */.
• pythonAnalyzer.ts analyzeFunction(): !body guard — sibling pythonAnalyzer.getBooleanOperator has the same style of guard already annotated.

Adding the annotations is purely documentation/consistency and slightly raises measured branch coverage (94.67% to 95.0%; jsLikeAnalyzer.ts branch coverage 99.15% to 100%).

Trade-offs

No behavior change. No new dependency. Minimal, surgical, two-line diff.

Test Status

• npm run compile: clean
• npm run lint: clean
• npm run test:coverage (unit tests + coverage): 227 passing, coverage 98.74/95.0/99.01/98.74 (up from 98.68/94.67/99.01/98.68)
• npm run test:vscode (full vscode-test suite): blocked by sandbox network (getaddrinfo EAI_AGAIN update.code.visualstudio.com) - same known limitation as every prior repo-assist run in this sandbox, not caused by this change.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.02%. Comparing base (a40c854) to head (4de7734).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #570      +/-   ##
==========================================
+ Coverage   97.92%   98.02%   +0.10%     
==========================================
  Files          12       12              
  Lines        3899     3901       +2     
  Branches      450      450              
==========================================
+ Hits         3818     3824       +6     
+ Misses         81       77       -4     

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[Copilot]

🟢 Approval recommended

The annotations correctly target defensive fallback paths and introduce no behavioral changes.

Pull request overview

Adds c8 coverage-ignore annotations to grammar-unreachable defensive guards without changing runtime behavior.

Changes:

• Annotates missing operator and Python function-body fallbacks.
• Aligns coverage handling with equivalent analyzer guards.

File summaries

File	Description
src/metricsAnalyzer/languages/jsLikeAnalyzer.ts	Ignores the unreachable missing-operator guard.
src/metricsAnalyzer/languages/pythonAnalyzer.ts	Ignores the unreachable missing-body guard.

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 0
• Review effort level: Balanced

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