fix(packaging): ship only the TMDB token line of QE/default.env

build-node.sh and build-node-runtime.ps1 copied QE/default.env whole into
every deb, rpm and Windows build after checking only its first 30 bytes. The
file is unversioned and sits beside other QE notes, so any line added to it
later would have gone out publicly. Only its first line ships now, and only
once it is exactly MESHBAY_TMDB_DEFAULT_TOKEN=<JWT>; a missing file, a BOM,
a token not on the first line or an empty one still stop the build.

The Linux step is run by a test against a scratch repo; the PowerShell one
has the same rule and was not run here.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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