fix(vehicle): calculate VIN check digit

[tianrking]

Summary

• calculate the ISO 3779 check digit for generated Vehicle Identification Numbers (VINs)
• preserve the existing random draws and replace only position 9 in the completed VIN
• add checksum coverage for generated VINs, the X modulo-11 case, and update the affected seeded snapshots

Root cause

vehicle.vin() generated the ninth character as an unconstrained alphanumeric value. That position is the VIN check digit in the North American VIN standard, so generated values commonly failed validation or contained an invalid letter there.

The calculation uses the standard transliteration table and positional weights. Its zero weight for position 9 means the existing generated VIN can be used as input, preserving the random sequence while replacing only the check digit.

Fixes #3952.

Validation

• corepack pnpm@10.34.4 run build
• corepack pnpm@10.34.4 exec vitest run test/modules/vehicle.spec.ts
• corepack pnpm@10.34.4 exec eslint src/modules/vehicle/module.ts test/modules/vehicle.spec.ts
• corepack pnpm@10.34.4 exec prettier --check src/modules/vehicle/module.ts test/modules/vehicle.spec.ts
• corepack pnpm@10.34.4 run ts-check
• corepack pnpm@10.34.4 run test (54,317 passing; one existing docs-version-links failure in test/docs/versions.spec.ts, unrelated to this change)
• git diff --check

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.91%. Comparing base (717fa14) to head (cf94509).

Additional details and impacted files

@@           Coverage Diff           @@
##             next    #3954   +/-   ##
=======================================
  Coverage   98.91%   98.91%           
=======================================
  Files         924      924           
  Lines        3224     3233    +9     
  Branches      585      569   -16     
=======================================
+ Hits         3189     3198    +9     
  Misses         31       31           
  Partials        4        4           

Files with missing lines	Coverage Δ
src/modules/vehicle/module.ts	100.00% <100.00%> (ø)

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[Copilot]

Pull request overview

This pull request fixes vehicle.vin() to generate ISO 3779 / North American–compliant VINs by computing and inserting the proper check digit at position 9, while keeping the existing random generation sequence intact (only the completed VIN’s 9th character is replaced).

Changes:

• Add VIN transliteration + weight tables and a local vinCheckDigit() helper to compute the ISO 3779 modulo-11 check digit (with 10 -> 'X').
• Update VehicleModule.vin() to splice the computed check digit into position 9 of the already-generated VIN.
• Add test coverage validating the check digit (including the 'X' case) and update affected seeded snapshots.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/modules/vehicle/module.ts	Computes and inserts the VIN check digit into position 9 without changing RNG draw count.
test/modules/vehicle.spec.ts	Adds a check-digit validator and asserts generated VINs have a correct position-9 check digit.
test/modules/__snapshots__/vehicle.spec.ts.snap	Updates seeded VIN snapshots to reflect the corrected check digit.

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

[xDivisionByZerox]

I might be stupid, but this link does not lead to any valid PDF for me 🤷‍♀️