fix(init): skip artifact dirs in project listing

[betegon]

Summary

Keeps generated output directories from spending the init list-dir entry budget. The directories still appear in the listing, but init no longer recurses into artifact-heavy folders.

This also moves high-confidence generated/cache folders into the shared scanner DEFAULT_SKIP_DIRS list, including package-manager caches, Python tool caches, framework outputs, native/.NET build output, and coverage outputs. Init keeps only the more debatable budget-only extras (bin, tmp, temp, Pods) on top of that shared policy.

This is intentionally narrower than #1080: no traversal rewrite, no response-shape changes, no depth change, and no platform-specific filename additions.

Test Plan

• pnpm exec vitest run test/lib/init/tools/list-dir.test.ts test/lib/init/tools/filesystem-tools.test.ts test/lib/scan/constants.property.test.ts test/lib/scan/walker.test.ts
• pnpm exec biome check src/lib/scan/constants.ts src/lib/init/tools/list-dir.ts test/lib/init/tools/list-dir.test.ts test/lib/scan/constants.property.test.ts

[github-actions]

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[github-actions]

Codecov Results 📊

✅ Patch coverage is 100.00%. Project has 4834 uncovered lines.
✅ Project coverage is 81.53%. Comparing base (base) to head (head).

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    81.53%    81.53%        —%
==========================================
  Files          374       374         —
  Lines        26173     26174        +1
  Branches     17080     17080         —
==========================================
+ Hits         21339     21340        +1
- Misses        4834      4834         —
- Partials      1768      1768         —

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