fix: scan-complete line prints vulnerabilities correctly

[RohithPariki]

Summary

Fixes a spelling error where the CLI output printed "vulnerabilitys" instead of "vulnerabilities" when completing a scan.

Problem

In the final scan summary printed to the terminal, if multiple vulnerabilities were found, the CLI would naively append an "s" resulting in the grammatically incorrect output: Found N vulnerabilitys. (Issue #905).

Root Cause

The pluralize function in src/output/printers.ts was being called as pluralize(count, "vulnerability"), which defaults to just appending an "s". It did not use the optional third argument for irregular plurals.

Solution

Updated the pluralize call to explicitly pass "vulnerabilities" as the irregular plural form: pluralize(count, "vulnerability", "vulnerabilities"). Also added a regression test to ensure this edge case remains covered.

Testing & Verification

• Unit test added in tests/output.test.ts to assert that pluralize correctly returns "vulnerabilities" when count > 1 and "vulnerability" when count === 1.
• Verified that running npm test passes successfully.

References

Closes #905

[sonukapoor]

Thanks for this, @RohithPariki - it is a real bug, good catch. It actually got fixed in main earlier today via #927, so this one is already covered. Closing as resolved, but genuinely appreciate you spotting it.