diff --git a/.github/workflows/wai-conformance.yml b/.github/workflows/wai-conformance.yml
index f235b0703..df7f89479 100644
--- a/.github/workflows/wai-conformance.yml
+++ b/.github/workflows/wai-conformance.yml
@@ -383,6 +383,13 @@ jobs:
         # Windows x86_64 leg removed 2026-09-30: runner offline. Restore by
         # re-adding `windows` here once the runner is back online.
         os: [linux, linux-arm64, macos]
+    # No debuginfo: nothing in CI reads DWARF, and it is most of a debug target's size. Three of
+    # these jobs at once on the linux-arm64 VM's 196 GB data disk ran out of space mid-link
+    # ("No space left on device", #542 and #550). Panic messages keep their file:line, which
+    # comes from the panic location, not from DWARF (standards-build.yml trims jouleclaw-rs the
+    # same way: ~6 GB without, against the full-debuginfo target that filled its disk).
+    env:
+      CARGO_PROFILE_DEV_DEBUG: '0'
     steps:
       - uses: actions/checkout@v5
 
@@ -1172,6 +1179,9 @@ jobs:
     name: independent verifiers · claims, JWP, key discovery and integer payloads (Python)
     runs-on: linux-arm64
     env:
+      # No debuginfo, for the reason given at cargo-classes: this job ran out of the VM's disk
+      # mid-link beside two others (#550).
+      CARGO_PROFILE_DEV_DEBUG: '0'
       WAI_FEATURES: key_discovery,http,video_manifest,stage_measure,live_events,live_room,capture_take,live_compose,live_record,timed_text,access_services,live_metering,energy_steering,live_moderation,dred_exact,live_ads,live_provenance,synthesis,synthesis_mark,neural_int,exact_upscale,robustness,ai_usage,contribution,settlement,browser_sink,receipt_claims,takedown,influence,direction,co_performance,age_assurance,bearer_receipts,exploration,co_watch,telemetry_aggregate,exact_tonemap,splat_exact,live_watermark,derive_edge,sink_energy,key_release,stitched_presentation,prior_wire,scene_map,avatar_face,receipt_ledger,stream_audit,fleet,native_sink,platform_encode,remote_desktop,stream_termination,live_world,format_probe,live_messaging,conform_result,revenue_share,opportunity_report,channel_lineup,route_record
       WAI_PQ_FEATURES: synthesis,pq_signatures
       WAI_RELEASE_FEATURES: dred_exact,synthesis_mark,robustness,avatar_face