Harden Panama launcher actions

tests/quickshell/osd-helper-contract.sh

@@ -47,12 +47,16 @@ cat >"$scratch/bin/qs" <<'SH'
 printf 'qs' >>"$OSD_TEST_LOG"
 printf ' <%s>' "$@" >>"$OSD_TEST_LOG"
 printf '\n' >>"$OSD_TEST_LOG"
+[[ ${OSD_TEST_FAIL_QS:-false} != true ]]
 SH
 
 chmod +x "$scratch/bin/"*
 
 run_helper() {
-    PATH="$scratch/bin:$PATH" OSD_TEST_LOG="$log" "$helper" "$@"
+    PATH="$scratch/bin:$PATH" OSD_TEST_LOG="$log" \
+        OSD_TEST_FAIL_QS="${OSD_TEST_FAIL_QS:-false}" \
+        PANAMA_OSD_STRICT="${PANAMA_OSD_STRICT:-false}" \
+        "$helper" "$@"
 }
 
 assert_line() {
@@ -95,4 +99,13 @@ assert_line 'qs <ipc> <call> <osd> <message> <media-next> <Horizon — Tycho>'
 run_helper message notifications-disabled-symbolic 'Do Not Disturb On'
 assert_line 'qs <ipc> <call> <osd> <message> <notifications-disabled-symbolic> <Do Not Disturb On>'
 
+: >"$log"
+if OSD_TEST_FAIL_QS=true PANAMA_OSD_STRICT=1 run_helper message dialog-error-symbolic 'Strict failure'; then
+    printf 'osd helper contract: strict delivery swallowed an IPC failure\n' >&2
+    exit 1
+fi
+
+: >"$log"
+OSD_TEST_FAIL_QS=true run_helper message dialog-information-symbolic 'Best effort'
+
 printf 'osd helper contract: PASS\n'