fix: resolve PRE_FIX_REV dynamically in ccb_fix verifiers

sg-evals mirrors use orphan commits with different SHAs than upstream.
Hardcoded upstream SHAs caused `git diff <sha>` to silently return
empty, making all diff_similarity verifiers report 0.0 regardless of
agent changes.

Fix: use `git rev-parse HEAD` to resolve the actual initial commit.
Affects 8 tasks: 5 pytorch, 2 envoy, 1 terraform.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: sjarmak

benchmarks/ccb_fix/envoy-dfp-host-leak-fix-001/tests/test.sh

@@ -12,7 +12,8 @@ set -eo pipefail
 mkdir -p /logs/verifier
 cd "${VERIFY_REPO:-/workspace}"
 git config --global --add safe.directory /workspace 2>/dev/null || true
-PRE_FIX_REV="5160151e14837c6f352b9d0b3a9f55119a9317e8"
+# Resolve initial commit — mirrors use orphan commits with different SHAs than upstream
+PRE_FIX_REV=$(git rev-parse HEAD 2>/dev/null || echo "HEAD")
 python3 /tests/verify_diff.py \
     --expected /tests/expected.diff \
     --pre-fix-rev "$PRE_FIX_REV" \

benchmarks/ccb_fix/envoy-udp-proxy-cds-fix-001/tests/test.sh

@@ -12,7 +12,8 @@ set -eo pipefail
 mkdir -p /logs/verifier
 cd "${VERIFY_REPO:-/workspace}"
 git config --global --add safe.directory /workspace 2>/dev/null || true
-PRE_FIX_REV="1ae957c1f92b8e0b0322ab702c67612aa618d214"
+# Resolve initial commit — mirrors use orphan commits with different SHAs than upstream
+PRE_FIX_REV=$(git rev-parse HEAD 2>/dev/null || echo "HEAD")
 python3 /tests/verify_diff.py \
     --expected /tests/expected.diff \
     --pre-fix-rev "$PRE_FIX_REV" \

benchmarks/ccb_fix/pytorch-cudnn-version-fix-001/tests/test.sh

@@ -12,7 +12,8 @@ set -eo pipefail
 mkdir -p /logs/verifier
 cd "${VERIFY_REPO:-/workspace}"
 git config --global --add safe.directory /workspace 2>/dev/null || true
-PRE_FIX_REV="5811a8d7da873dd699ff6687092c225caffcf1bb"
+# Resolve initial commit — mirrors use orphan commits with different SHAs than upstream
+PRE_FIX_REV=$(git rev-parse HEAD 2>/dev/null || echo "HEAD")
 python3 /tests/verify_diff.py \
     --expected /tests/expected.diff \
     --pre-fix-rev "$PRE_FIX_REV" \

benchmarks/ccb_fix/pytorch-dynamo-keyerror-fix-001/tests/test.sh

@@ -12,7 +12,8 @@ set -eo pipefail
 mkdir -p /logs/verifier
 cd "${VERIFY_REPO:-/workspace}"
 git config --global --add safe.directory /workspace 2>/dev/null || true
-PRE_FIX_REV="cbe1a35dbdfdc9b7490212bdd812f3e2f4ce9e2d"
+# Resolve initial commit — mirrors use orphan commits with different SHAs than upstream
+PRE_FIX_REV=$(git rev-parse HEAD 2>/dev/null || echo "HEAD")
 python3 /tests/verify_diff.py \
     --expected /tests/expected.diff \
     --pre-fix-rev "$PRE_FIX_REV" \

benchmarks/ccb_fix/pytorch-release-210-fix-001/tests/test.sh

@@ -12,7 +12,8 @@ set -eo pipefail
 mkdir -p /logs/verifier
 cd "${VERIFY_REPO:-/workspace}"
 git config --global --add safe.directory /workspace 2>/dev/null || true
-PRE_FIX_REV="863edc787f5fa7950e0f3f86d4952641e1ef9c2c"
+# Resolve initial commit — mirrors use orphan commits with different SHAs than upstream
+PRE_FIX_REV=$(git rev-parse HEAD 2>/dev/null || echo "HEAD")
 python3 /tests/verify_diff.py \
     --expected /tests/expected.diff \
     --pre-fix-rev "$PRE_FIX_REV" \

benchmarks/ccb_fix/pytorch-relu-gelu-fusion-fix-001/tests/test.sh

@@ -12,7 +12,8 @@ set -eo pipefail
 mkdir -p /logs/verifier
 cd "${VERIFY_REPO:-/workspace}"
 git config --global --add safe.directory /workspace 2>/dev/null || true
-PRE_FIX_REV="ca2466126a00ba8fd877f5a185e40e36ddaceb87"
+# Resolve initial commit — mirrors use orphan commits with different SHAs than upstream
+PRE_FIX_REV=$(git rev-parse HEAD 2>/dev/null || echo "HEAD")
 python3 /tests/verify_diff.py \
     --expected /tests/expected.diff \
     --pre-fix-rev "$PRE_FIX_REV" \

benchmarks/ccb_fix/pytorch-tracer-graph-cleanup-fix-001/tests/test.sh

@@ -12,7 +12,8 @@ set -eo pipefail
 mkdir -p /logs/verifier
 cd "${VERIFY_REPO:-/workspace}"
 git config --global --add safe.directory /workspace 2>/dev/null || true
-PRE_FIX_REV="d18007a1d0b1ea9a6b2bcd74e8b128eab4b434a0"
+# Resolve initial commit — mirrors use orphan commits with different SHAs than upstream
+PRE_FIX_REV=$(git rev-parse HEAD 2>/dev/null || echo "HEAD")
 python3 /tests/verify_diff.py \
     --expected /tests/expected.diff \
     --pre-fix-rev "$PRE_FIX_REV" \

benchmarks/ccb_fix/terraform-plan-null-unknown-fix-001/tests/test.sh

@@ -12,7 +12,8 @@ set -eo pipefail
 mkdir -p /logs/verifier
 cd "${VERIFY_REPO:-/workspace}"
 git config --global --add safe.directory /workspace 2>/dev/null || true
-PRE_FIX_REV="abd6b9ef1ba5e98ed273f59f667d3b9f2077a87b"
+# Resolve initial commit — mirrors use orphan commits with different SHAs than upstream
+PRE_FIX_REV=$(git rev-parse HEAD 2>/dev/null || echo "HEAD")
 python3 /tests/verify_diff.py \
     --expected /tests/expected.diff \
     --pre-fix-rev "$PRE_FIX_REV" \