Bash harness hides where docs say Python

Project CLAUDE.md described a src/harness/{claude,codex,kimi,ccr_router}.py module structure, but that directory was just an empty init.py — all real harness logic lived in a single scripts/run_hard.sh as a case statement, one branch per agent CLI. The docstring was stale; trusting it would have wasted time grepping Python that did not exist. The active model matrix was also in shell (sweep.sh), not Python.