fix: add git config to 50 Dockerfile.sg_only files to fix MCP build failures

The sg_only truncation step (`git commit -m "sg_only truncation"`) failed
with exit code 128 in Docker builds because git user.email/user.name
were not configured. This caused RuntimeError for all MCP configs on
tasks using the backup+truncate pattern (build, debug, fix, design suites
plus 6 test/perf tasks).

Adds `git config user.email "agent@example.com" && git config user.name
"Agent"` before the git commit in all three workspace path variants:
/workspace (21 files), /app (21 files), /app/repo (8 files).

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

Author: sjarmak

benchmarks/ccb_build/bustub-hyperloglog-impl-001/environment/Dockerfile.sg_only

@@ -22,6 +22,6 @@ RUN find /workspace -type f \( -name "*.py" -o -name "*.pyx" -o -name "*.pyi" -o
 # Recommit truncated state so git history cannot recover full files.
 # Without this, `git show HEAD:<file>` or `git checkout HEAD -- <file>`
 # would bypass truncation by reading from the pre-truncation commit.
-RUN cd /workspace && git add -A && git commit -m "sg_only truncation" --allow-empty --quiet
+RUN cd /workspace && git config user.email "agent@example.com" && git config user.name "Agent" && git add -A && git commit -m "sg_only truncation" --allow-empty --quiet
 RUN touch /tmp/.sg_only_mode && echo '/workspace' > /tmp/.sg_only_workdir
 CMD ["bash"]

benchmarks/ccb_build/cgen-deps-install-001/environment/Dockerfile.sg_only

@@ -22,7 +22,7 @@ RUN find /app/repo -type f \( -name "*.py" -o -name "*.pyx" -o -name "*.pyi" -o
 # Recommit truncated state so git history cannot recover full files.
 # Without this, `git show HEAD:<file>` or `git checkout HEAD -- <file>`
 # would bypass truncation by reading from the pre-truncation commit.
-RUN cd /app/repo && git add -A && git commit -m "sg_only truncation" --allow-empty --quiet
+RUN cd /app/repo && git config user.email "agent@example.com" && git config user.name "Agent" && git add -A && git commit -m "sg_only truncation" --allow-empty --quiet
 RUN touch /tmp/.sg_only_mode && echo '/app/repo' > /tmp/.sg_only_workdir
 
 WORKDIR /app/repo

benchmarks/ccb_build/codecoverage-deps-install-001/environment/Dockerfile.sg_only

@@ -26,7 +26,7 @@ RUN find /app/repo -type f \( -name "*.py" -o -name "*.pyx" -o -name "*.pyi" -o
 # Recommit truncated state so git history cannot recover full files.
 # Without this, `git show HEAD:<file>` or `git checkout HEAD -- <file>`
 # would bypass truncation by reading from the pre-truncation commit.
-RUN cd /app/repo && git add -A && git commit -m "sg_only truncation" --allow-empty --quiet
+RUN cd /app/repo && git config user.email "agent@example.com" && git config user.name "Agent" && git add -A && git commit -m "sg_only truncation" --allow-empty --quiet
 RUN touch /tmp/.sg_only_mode && echo '/app/repo' > /tmp/.sg_only_workdir
 
 WORKDIR /app/repo

benchmarks/ccb_build/dotenv-expand-deps-install-001/environment/Dockerfile.sg_only

@@ -24,7 +24,7 @@ RUN find /app/repo -type f \( -name "*.py" -o -name "*.pyx" -o -name "*.pyi" -o
 # Recommit truncated state so git history cannot recover full files.
 # Without this, `git show HEAD:<file>` or `git checkout HEAD -- <file>`
 # would bypass truncation by reading from the pre-truncation commit.
-RUN cd /app/repo && git add -A && git commit -m "sg_only truncation" --allow-empty --quiet
+RUN cd /app/repo && git config user.email "agent@example.com" && git config user.name "Agent" && git add -A && git commit -m "sg_only truncation" --allow-empty --quiet
 RUN touch /tmp/.sg_only_mode && echo '/app/repo' > /tmp/.sg_only_workdir
 
 WORKDIR /app/repo

benchmarks/ccb_build/dotnetkoans-deps-install-001/environment/Dockerfile.sg_only

@@ -26,7 +26,7 @@ RUN find /app/repo -type f \( -name "*.py" -o -name "*.pyx" -o -name "*.pyi" -o
 # Recommit truncated state so git history cannot recover full files.
 # Without this, `git show HEAD:<file>` or `git checkout HEAD -- <file>`
 # would bypass truncation by reading from the pre-truncation commit.
-RUN cd /app/repo && git add -A && git commit -m "sg_only truncation" --allow-empty --quiet
+RUN cd /app/repo && git config user.email "agent@example.com" && git config user.name "Agent" && git add -A && git commit -m "sg_only truncation" --allow-empty --quiet
 RUN touch /tmp/.sg_only_mode && echo '/app/repo' > /tmp/.sg_only_workdir
 
 WORKDIR /app/repo

benchmarks/ccb_build/envoy-grpc-server-impl-001/environment/Dockerfile.sg_only

@@ -41,6 +41,6 @@ RUN find /workspace -type f \( -name "*.py" -o -name "*.pyx" -o -name "*.pyi" -o
 # Recommit truncated state so git history cannot recover full files.
 # Without this, `git show HEAD:<file>` or `git checkout HEAD -- <file>`
 # would bypass truncation by reading from the pre-truncation commit.
-RUN cd /workspace && git add -A && git commit -m "sg_only truncation" --allow-empty --quiet
+RUN cd /workspace && git config user.email "agent@example.com" && git config user.name "Agent" && git add -A && git commit -m "sg_only truncation" --allow-empty --quiet
 RUN touch /tmp/.sg_only_mode && echo '/workspace' > /tmp/.sg_only_workdir
 CMD ["/bin/bash"]

benchmarks/ccb_build/eslint-markdown-deps-install-001/environment/Dockerfile.sg_only

@@ -24,7 +24,7 @@ RUN find /app/repo -type f \( -name "*.py" -o -name "*.pyx" -o -name "*.pyi" -o
 # Recommit truncated state so git history cannot recover full files.
 # Without this, `git show HEAD:<file>` or `git checkout HEAD -- <file>`
 # would bypass truncation by reading from the pre-truncation commit.
-RUN cd /app/repo && git add -A && git commit -m "sg_only truncation" --allow-empty --quiet
+RUN cd /app/repo && git config user.email "agent@example.com" && git config user.name "Agent" && git add -A && git commit -m "sg_only truncation" --allow-empty --quiet
 RUN touch /tmp/.sg_only_mode && echo '/app/repo' > /tmp/.sg_only_workdir
 
 WORKDIR /app/repo

benchmarks/ccb_build/iamactionhunter-deps-install-001/environment/Dockerfile.sg_only

@@ -22,7 +22,7 @@ RUN find /app/repo -type f \( -name "*.py" -o -name "*.pyx" -o -name "*.pyi" -o
 # Recommit truncated state so git history cannot recover full files.
 # Without this, `git show HEAD:<file>` or `git checkout HEAD -- <file>`
 # would bypass truncation by reading from the pre-truncation commit.
-RUN cd /app/repo && git add -A && git commit -m "sg_only truncation" --allow-empty --quiet
+RUN cd /app/repo && git config user.email "agent@example.com" && git config user.name "Agent" && git add -A && git commit -m "sg_only truncation" --allow-empty --quiet
 RUN touch /tmp/.sg_only_mode && echo '/app/repo' > /tmp/.sg_only_workdir
 
 WORKDIR /app/repo

benchmarks/ccb_build/k8s-runtime-object-impl-001/environment/Dockerfile.sg_only

@@ -36,6 +36,6 @@ RUN find /workspace -type f \( -name "*.py" -o -name "*.pyx" -o -name "*.pyi" -o
 # Recommit truncated state so git history cannot recover full files.
 # Without this, `git show HEAD:<file>` or `git checkout HEAD -- <file>`
 # would bypass truncation by reading from the pre-truncation commit.
-RUN cd /workspace && git add -A && git commit -m "sg_only truncation" --allow-empty --quiet
+RUN cd /workspace && git config user.email "agent@example.com" && git config user.name "Agent" && git add -A && git commit -m "sg_only truncation" --allow-empty --quiet
 RUN touch /tmp/.sg_only_mode && echo '/workspace' > /tmp/.sg_only_workdir
 CMD ["/bin/bash"]

benchmarks/ccb_build/pcap-parser-deps-install-001/environment/Dockerfile.sg_only

@@ -24,7 +24,7 @@ RUN find /app/repo -type f \( -name "*.py" -o -name "*.pyx" -o -name "*.pyi" -o
 # Recommit truncated state so git history cannot recover full files.
 # Without this, `git show HEAD:<file>` or `git checkout HEAD -- <file>`
 # would bypass truncation by reading from the pre-truncation commit.
-RUN cd /app/repo && git add -A && git commit -m "sg_only truncation" --allow-empty --quiet
+RUN cd /app/repo && git config user.email "agent@example.com" && git config user.name "Agent" && git add -A && git commit -m "sg_only truncation" --allow-empty --quiet
 RUN touch /tmp/.sg_only_mode && echo '/app/repo' > /tmp/.sg_only_workdir
 
 WORKDIR /app/repo