PR-URL: #41586
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Mestery <mestery@protonmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Beth Griggs <bgriggs@redhat.com>
Reviewed-By: Tierney Cyren <hello@bnb.im>

PR-URL: #41586
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Mestery <mestery@protonmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Beth Griggs <bgriggs@redhat.com>
Reviewed-By: Tierney Cyren <hello@bnb.im>

PR-URL: #41586
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Mestery <mestery@protonmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Beth Griggs <bgriggs@redhat.com>
Reviewed-By: Tierney Cyren <hello@bnb.im>

PR-URL: #41586
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Mestery <mestery@protonmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Beth Griggs <bgriggs@redhat.com>
Reviewed-By: Tierney Cyren <hello@bnb.im>

PR-URL: #41586
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Mestery <mestery@protonmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Beth Griggs <bgriggs@redhat.com>
Reviewed-By: Tierney Cyren <hello@bnb.im>

The previous deploy (1cf105f) failed its own postbuild verification on
Vercel — correctly. On Linux, nf3 nests version-conflicted deps as symlinks
*inside* store packages (google-auth-library/node_modules/gaxios and 21
friends), and fs.cpSync({ dereference: true }) only dereferences the
top-level path: nested links are recreated as links (nodejs/node#41586), so
the "materialized" tree still dangled. Windows never showed it because nf3's
junction layout keeps every link top-level, which is exactly why the local
verification passed while Vercel's failed.

The copy is now hand-rolled: copyReal() stats through symlinks at every
depth, so the output contains none regardless of layout. Verified in a clean
node:24 container from a tarball of this tree: npm ci + VERCEL=1 build exit
0, 19 links materialized, `find -type l` = 0, and the function artifact
serves / at 200 and /api/available-models at 200 in the same container.

Also makes the Sentry sourcemap upload non-fatal via errorHandler. The
plugin's default is to throw and kill the build on any upload failure — a
wrong org slug, an expired token, a Sentry outage. Observability must never
take down a deploy. Exercised in the same container with deliberately
invalid SENTRY_* values: three 401s from Sentry, three warnings in the log,
build exit 0, and zero .map files left in the output.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>