Two independent failures, both of which stopped `make plugin` outright here.
GNU `sed -i` takes no suffix argument; BSD sed requires one and reads the
script as that suffix, so all three calls errored — and under `set -euo
pipefail` that aborts the installer. They go through a temp file now, written
back with `cat >` so the profile keeps its mode and owner.
While rewriting them: the orphan-comment cleanup `{N; /^\n$/d;}` could never
match on ANY platform — after N the pattern space starts with '#', so the
^\n$ anchor pair never applied. It was a silent no-op, now awk, and tested on
/bin/bash 3.2: both obsolete entries and their stranded headers go, the live
entry and the user's own lines stay, idempotent on re-run.
The second failure was worse because it was invisible: gstack's ./setup runs
`bunx playwright install chromium` unbounded, and Playwright 1.58.2 deadlocks
on Node 26 mid-extraction — both processes idle at 39/333 files, no error, no
progress, forever. That silently cut the 2026-09-13 run at step 2 of 10.
Chromium is now installed here instead, under a 900s deadline; on timeout the
installer bumps gstack's Playwright (its package.json declares "^1.x", so a
minor bump is in range) and retries once, then warns rather than aborts —
gstack is OFF by default and only its browser depends on this.
`timeout` is not in a stock macOS, so the deadline is pure bash. Proven by a
forced hang: rc 124 in 6s, no orphaned oopDownloadBrowserMain, stderr clean.
