build: enable noImplicitReturns in tsconfig to catch missing return paths

[github-actions]

🤖 This is an automated pull request from Repo Assist.

Summary

Enables the noImplicitReturns TypeScript compiler flag in tsconfig.json, so the compiler reports an error when not all code paths in a function return a value. This catches a common category of bugs (missing return on some branch) at compile time rather than at runtime.

What Changed

tsconfig.json:

• Added a trailing comma after noFallthroughCasesInSwitch (was missing, which would have caused a parse error if noImplicitReturns were enabled)
• Uncommented "noImplicitReturns": true

Why

noImplicitReturns is already enabled in most production TypeScript codebases. The existing codebase compiles with zero errors under this flag — enabling it costs nothing today but prevents future regressions.

Test Status

npm run compile  ✅  (0 errors)
npm run lint     ✅  (0 warnings)
npm run test:unit  ✅  137 passing, 0 failing

No code changes required — the existing source already satisfies this constraint.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.17%. Comparing base (3c93a5a) to head (95d4f18).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #408   +/-   ##
=======================================
  Coverage   78.17%   78.17%           
=======================================
  Files          13       13           
  Lines        4164     4164           
  Branches      468      468           
=======================================
  Hits         3255     3255           
  Misses        906      906           
  Partials        3        3           

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