Fix Docker tests to achieve 100% on 2/3 installation methods

Major fixes:
- Fixed Claude Code verification (was checking 'claude-code', now checks 'claude')
- Fixed volume mount paths (use absolute path /tmp/claude-repo for runtime)
- Fixed agents copy path (removed incorrect /agents/ subdirectory)
- Fixed critical agent paths (studio-coach in bonus/, not project-management)
- Added expect package for interactive installer automation
- Fixed test count aggregation to read from individual result files

Test Results (after fixes):
✅ Manual Installation: 27/27 passing (100%)
✅ Master Prompt Installation: 15/15 passing (100%)
⚠️  Interactive Installer: 7/13 passing (54% - expect automation issue)

Note: Interactive installer works fine for manual testing, just difficult
to automate with expect scripts due to prompt matching complexity.

docker/test-env/Dockerfile

@@ -21,6 +21,7 @@ RUN apt-get update && apt-get install -y \
     bash \
     ca-certificates \
     gnupg \
+    expect \
     && rm -rf /var/lib/apt/lists/*
 
 # Install Node.js 20.x from official NodeSource repository
@@ -39,8 +40,8 @@ RUN useradd -m -s /bin/bash testuser && \
 WORKDIR /home/testuser
 RUN chown -R testuser:testuser /home/testuser
 
-# Copy repository files
-COPY --chown=testuser:testuser ../../ /home/testuser/claude-code-glm-suite/
+# Copy repository files (relative to build context)
+COPY --chown=testuser:testuser ../../../ /home/testuser/claude-code-glm-suite/
 
 # Switch to test user
 USER testuser