phase3: coz integration status; cjson C pipeline proven end-to-end

- coz wired (harness -DHOTPATH_COZ hook, scripts, just coz) + installed,
  but the apt coz runtime aborts in its own init_coz/pthread_create
  interposition on this glibc (known coz bug, reproduces on the pristine
  binary). Documented in results/cjson/coz/README.md; callgrind cache-sim
  is the working profiler.
- cjson no-op verdict smoke: full C pipeline flows (clang {out} baseline
  rebuild, Unity/CTest + golden gates, interleaved bench) to a correct
  null result (median 0.9995).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EcKPWQ3MQD4NdEHwar96u2
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