v1.15.0b: bump omos smoke threshold 3200->3300, omos-with-pi 3400->3500

opencode 1.15.0 grew the omos image to 3206 MB, 6 MB over the existing
3200 MB threshold, causing smoke-omos to fail and build-variant-omos
to be skipped in v1.15.0. Bump thresholds with ~100 MB headroom for
routine apt-get upgrade drift.

No image-side changes — pure smoke threshold update. v1.15.0b will hit
the base hash cache and run only the variant deltas.

scripts/smoke-test.sh

@@ -289,14 +289,16 @@ SIZE_BYTES=$(docker image inspect --format='{{.Size}}' "$IMAGE")
 SIZE_MB=$((SIZE_BYTES / 1024 / 1024))
 echo "  Uncompressed size: ${SIZE_MB} MB"
 
-# Thresholds (uncompressed): base 2500 MB, omos 3200 MB, with-pi adds ~150 MB.
+# Thresholds (uncompressed): base 2500 MB, omos 3300 MB, with-pi adds ~150 MB.
 # omos bumped 3000→3200 on v1.14.31c — mempalace-toolkit bake-in pushed the
+# baseline; bumped 3200→3300 on v1.15.0 — opencode 1.15.0 came in at
+# 3206 MB, leaving zero headroom for routine apt-get upgrade drift.
 # omos variant to ~3.1 GB. Functional smoke checks all pass; this is a
 # guardrail, not a performance limit.
 THRESHOLD=2500
-[ "$VARIANT" = "omos" ] && THRESHOLD=3200
+[ "$VARIANT" = "omos" ] && THRESHOLD=3300
 [ "$VARIANT" = "with-pi" ] && THRESHOLD=2700
-[ "$VARIANT" = "omos-with-pi" ] && THRESHOLD=3400
+[ "$VARIANT" = "omos-with-pi" ] && THRESHOLD=3500
 if [ "$SIZE_MB" -gt "$THRESHOLD" ]; then
   fail "image size ${SIZE_MB} MB exceeds threshold ${THRESHOLD} MB for variant=$VARIANT"
 else