fix(bild): per-module builds + exit code propagation

- Fix nixBuild to propagate exit code from realise step
  - Previously used >> which discarded exit code - Now checks realise
  result before running symlink - Fixes false success checkmarks on
  build failures

- Fix per-module Nix derivations
  - Use cp -rL instead of tar (src is directory not tarball) - Add
  coreutils and findutils to pkgs - Copy deps to . and use -i. for
  GHC - Use find with --parents to preserve module hierarchy - Set
  dontStrip=true to avoid fixup script errors

- Tested: Example.hs, Task.hs, Dragons.hs, Bild.hs all build - Known
issue: makeWrapper fixup scripts have unbound vars (Nix bug)

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