fix(remote-job): a job name is data, never a shell pattern

`status` built its job list with `for n in $names`, which word-splits AND globs. The
second half is the bug: a job named `x*` was expanded against the caller's working
directory, so the report described unrelated files there as jobs and never mentioned
the one that ran — on a harness whose whole purpose is a report you can trust after
the session that started the job is gone. Splitting stays (several names in one
argument is the documented call shape); expansion goes.

`tail` was honest-by-accident in the wrong direction: with no jobs it handed a
literal `$JOBS/*.out` to tail, which reports a missing *file* — indistinguishable
from a broken tool — and a missing name produced tail's errno rather than "no job
called that". Both now say what is missing and exit 1.

Red first: the name test reads the report from a directory containing an unrelated
file, so the old glob is visible as a phantom job; both new tests fail against the
previous code and pass against this one.

Refs #60

tests/remote-job.bats

@@ -122,6 +122,31 @@ until_done() {
   [[ "$output" == *38* ]]   # the tail, not the head
 }
 
+@test "status treats a job name as a name, not a pattern" {
+  "$SCRIPT" start 'x*' -- bash -c 'echo star'
+  until_done 'x*'
+  touch "$TEST_TMP/anchor"
+  # The report is read from a directory full of unrelated files on purpose: a name that is
+  # expanded as a glob resolves against the CALLER's cwd, so the tool would describe `anchor`
+  # as a job and never mention the one that really ran.
+  run bash -c 'cd "$1" && "$2" status "$3"' _ "$TEST_TMP" "$SCRIPT" 'x*'
+  [[ "$output" == "  x*"*"DONE   rc=0"* ]]
+  [[ "$output" != *anchor* ]]
+}
+
+@test "tail on an empty harness and on a missing job both say so" {
+  # An unexpanded `*.out` reaching tail is reported as a missing FILE, which reads as a broken
+  # script; the honest answer is that there is nothing to follow yet.
+  run timeout 5 "$SCRIPT" tail
+  [ "$status" -ne 0 ]
+  [[ "$output" == *"no jobs"* ]]
+  [[ "$output" != *".out"* ]]
+  run timeout 5 "$SCRIPT" tail nosuchjob
+  [ "$status" -ne 0 ]
+  [[ "$output" == *"nosuchjob"* ]]
+  [[ "$output" != *"No such file"* ]]
+}
+
 @test "an unknown verb is a usage error" {
   run "$SCRIPT" frobnicate
   [ "$status" -eq 2 ]