6m0 re-raise interrupt to $BASHPID, not $$, in render subshell

The signal handler in source_template_file re-raised the caught signal
with `kill -s $sig $$`. Because the function commonly runs inside
backgrounded render subshells (queue_album_view_render_job), $$ expands
to the main shuriken PID, not the subshell's own. On interrupt the
handler therefore signalled the main shell -- which had already cleared
its own staging traps -- killing it mid-cleanup (leaking the staging
dir) instead of terminating just the render subshell.

Re-raise to $BASHPID, the current (sub)shell's real PID, which equals $$
in the foreground case so it is correct everywhere. Extend
test_template_interrupt_removes_context_file to run the render in a
backgrounded subshell and assert the parent shell survives the re-raise;
verified it fails against a $$-based build and passes with $BASHPID.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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