fix(hooks): the timeline Stop hook bounds its stdin read (#3628)

A host that writes the Stop payload and keeps stdin open held the hook for
as long as the pipe stayed open. Read for at most 500 ms, stop at the first
complete JSON payload, and await the repair before exiting 0.

Reported in #3628 (shahab, mashtii85); the read is written fresh on main.

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

scripts/lib/windows-curation.ts

@@ -341,6 +341,7 @@ export const KNOWN_WINDOWS_SAFE: Array<{ file: string; reason: string }> = [
   { file: 'test/setup-hook-syntax-gate.test.ts', reason: '#3088/#3100: runs bin/gstack-hook-check and the setup hook sections through explicit bash with forward-slash paths; never executes a shebang. Its Bun drive-path spelling is the Windows bug it guards' },
   { file: 'test/bun-config-shell-bins.test.ts', reason: '#3415: runs the record bins through lib/script-invocation.ts (Git Bash on Windows) with MSYS path conversion off, the case it guards; its bun and cygpath stand-ins and simulated-OSTYPE cases are skipIf win32' },
   { file: 'test/path-spelling.test.ts', reason: 'sources bin/gstack-path-spelling.sh through explicit bash and checks lib/path-spelling.ts; on Windows it exercises the real Git Bash spellings' },
+  { file: 'test/timeline-stop-hook-stdin.test.ts', reason: '#3628: the hook runs through Bun argv with a stdin pipe held open; the return-within-budget timing must meet real Windows process startup' },
   { file: 'test/state-root-parity.test.ts', reason: 'runs the bash twin and lib/state-root.ts over an env table with PATH empty; no shebang execution, raw-string comparison is platform-neutral' },
   { file: 'test/generator-eexist.test.ts',
     reason: 'E4: runs the generators through Bun argv with the Windows EEXIST emulation preload; no shebang execution' },