[repo-assist] test: cover jsLikeAnalyzer computed object-property-key fallback

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Summary

Adds a unit test covering getFunctionName in jsLikeAnalyzer.ts for the case where an anonymous function_expression is assigned to a computed object property key (e.g. { [computedKey]: function() {} }). Previously this branch (line 228: keyNode?.type === "property_identifier" || keyNode?.type === "identifier") was exercised only by the "true" side (bare identifier keys); a computed key correctly falls through to (anonymous), but that fallback path was untested.

Rationale

• Genuine, low-risk coverage gap identified via npm run test:coverage (branch coverage for jsLikeAnalyzer.ts was 98.33%, missing branch on line 228).
• No production code changes — test-only addition, zero behavioral risk.
• Confirms the existing fallback behavior (computed keys can't be statically resolved to a name, so (anonymous) is correct) is locked in by a regression test.

Test Status

npm run compile   ✅ (0 errors)
npm run lint      ✅ (0 warnings)
npm run test:unit ✅ 218 passing, 0 failing

Coverage improved: jsLikeAnalyzer.ts branch coverage 98.33% → 99.17% (line 228 fully covered; remaining gap at line 465 is a pre-existing, likely-defensive fallback in getOperator, left untouched per minimal-scope guidance).

Trade-offs

None — this is a pure test addition with no behavior change.

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