zero-gravity: detect tarball layout; galileo 3.0.8 moved binaries to a shared root bin/

Fixes the de-32 build break introduced by vibe-node #2912 (galileo 3.0.3 -> 3.0.8,
merged as bc4cecf). Job ad580587:

    #16 chmod: cannot access '/0g/bin/0gchaind': No such file or directory

The Dockerfile hardcoded 'galileo -> mv <root>/rpc /0g'. That held for 3.0.3, where
every profile dir carried its own copy of the binaries. 3.0.8 DEDUPLICATED them into
a shared <root>/bin/ (168 MB -> 69 MB), leaving rpc/ as configs-only — so the move
produced configs and no binaries, and the build died two layers later on a chmod.

Note 'does <root>/rpc exist' is not a sufficient test: 3.0.8 still ships rpc/, it just
no longer holds bin/. Verified layouts:

  galileo 3.0.3     <root>/{rpc,validator,archive,seed}/bin/ + configs
  galileo 3.0.8     <root>/bin/ shared + <root>/{rpc,...}/ configs
  aristotle 1.0.6   <root>/bin/ + configs, no profile dirs

So: take configs from the profile dir when present, then top the binaries up from the
shared root bin/ if the profile dir did not supply them.

Also asserts both binaries exist immediately after extraction, naming the chain, the
version and the known layouts — so the next upstream reshuffle reports itself at the
point of failure rather than as an anonymous chmod error.

Verified against the real artifacts — all three now yield an identical /0g
(bin/0gchaind 76M, bin/geth 46M, geth-config.toml, geth-genesis.json,
kzg-trusted-setup.json, 0g-home/, rollback_cl.sh), and a synthetic unknown layout
exits 1 with the diagnostic instead of reaching chmod.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

zero-gravity/zerog.Dockerfile

@@ -48,17 +48,52 @@ RUN set -eu; \
         exit 1; \
     fi
 
-RUN tar -xzf /tmp/${ZERO_GRAVITY_CHAIN_SPEC}-v${ZERO_GRAVITY_VERSION}.tar.gz -C /tmp
-RUN if [ "${ZERO_GRAVITY_CHAIN_SPEC}" = "galileo" ]; then \
-        mv /tmp/${ZERO_GRAVITY_CHAIN_SPEC}-v${ZERO_GRAVITY_VERSION}/rpc /0g; \
+# Extract by DETECTING the layout rather than assuming one per chain. 0G has shipped
+# three shapes so far and changed between them without notice:
+#
+#   galileo <= 3.0.3  <root>/{rpc,validator,archive,seed}/bin/ + configs   (168 MB)
+#                     -> binaries duplicated inside every profile dir
+#   galileo >= 3.0.8  <root>/bin/  shared, + <root>/{rpc,...}/ configs      (69 MB)
+#                     -> binaries DEDUPLICATED to the tarball root; rpc/ is configs-only
+#   aristotle 1.0.x   <root>/bin/ + configs, no profile dirs at all
+#
+# So "does <root>/rpc exist" is NOT sufficient: 3.0.8 still has rpc/, it just no longer
+# holds bin/. Take configs from the profile dir when present, then top the binaries up
+# from the shared root bin/ if the profile dir didn't supply them.
+#
+# The old code hardcoded "galileo -> mv <root>/rpc /0g", so 3.0.8 yielded configs but no
+# binaries and the build died two layers later at
+# `chmod: cannot access '/0g/bin/0gchaind'` — an error naming neither the chain, the
+# version, nor the layout. Assert on the binaries here so the NEXT upstream reshuffle
+# reports itself at the point of failure instead.
+RUN set -eu; \
+    SRC="/tmp/${ZERO_GRAVITY_CHAIN_SPEC}-v${ZERO_GRAVITY_VERSION}"; \
+    tar -xzf "${SRC}.tar.gz" -C /tmp; \
+    mkdir -p /0g; \
+    if [ -d "${SRC}/rpc" ]; then \
+        echo "0g: profile dir found -> ${SRC}/rpc"; \
+        cp -a "${SRC}/rpc/." /0g/; \
     else \
-        mkdir -p /0g && \
-        cp -a /tmp/${ZERO_GRAVITY_CHAIN_SPEC}-v${ZERO_GRAVITY_VERSION}/* /0g/ 2>/dev/null || true; \
-        cp -a /tmp/${ZERO_GRAVITY_CHAIN_SPEC}-v${ZERO_GRAVITY_VERSION}/.[^.]* /0g/ 2>/dev/null || true; \
-        rm -rf /tmp/${ZERO_GRAVITY_CHAIN_SPEC}-v${ZERO_GRAVITY_VERSION}; \
-    fi
-
-RUN chmod +x /0g/bin/0gchaind
-RUN chmod +x /0g/bin/geth
+        echo "0g: no profile dir -> using tarball root ${SRC}"; \
+        cp -a "${SRC}/." /0g/; \
+    fi; \
+    if [ ! -f /0g/bin/0gchaind ] && [ -d "${SRC}/bin" ]; then \
+        echo "0g: binaries not in the profile dir -> topping up from ${SRC}/bin"; \
+        cp -a "${SRC}/bin" /0g/; \
+    fi; \
+    rm -rf "${SRC}"; \
+    missing=""; \
+    for b in 0gchaind geth; do \
+        [ -f "/0g/bin/${b}" ] || missing="${missing} bin/${b}"; \
+    done; \
+    if [ -n "${missing}" ]; then \
+        echo "0g: FATAL - missing after extraction:${missing}" >&2; \
+        echo "0g: ${ZERO_GRAVITY_CHAIN_SPEC} v${ZERO_GRAVITY_VERSION} tarball layout not recognised." >&2; \
+        echo "0g: known layouts are '<root>/rpc/bin/' (per-profile) and '<root>/bin/' (flat)." >&2; \
+        echo "0g: contents of /0g were:" >&2; \
+        ls -la /0g >&2 || true; \
+        exit 1; \
+    fi; \
+    chmod +x /0g/bin/0gchaind /0g/bin/geth
 
 ENTRYPOINT [ "init.sh" ]