[repo-assist] 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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🤖 This PR was created by Repo Assist, an automated AI assistant, as part of its regular maintenance run.

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