Add a shared log taxonomy (error<warn<info<debug<trace, default info) wired
through all three layers, plus a machine-readable per-step run log.
- scripts/casan-log.mjs + .specify/scripts/bash/casan-log.sh: shared logger
([LEVEL] ts [component] msg), stderr-only so stdout contracts and exit codes
are byte-identical. Node side includes trace-level redaction (secret/PII).
- run-casan-pipeline.mjs: per-STEP info line, loop-activation warnings
(BACK-TO-PLAN, FAIL->STEP6), debug harness rc + trace_id, trace payload
excerpt, end-of-run 13-STEP summary table, and one JSONL line/step in
.specify/logs/pipeline-run.jsonl. New --dry-run stubs all agents but keeps
the real wrapper in the loop (deterministic, offline, full 13 STEP + loops).
- casan-step.mjs: debug logs for judge verdict, checkpoint, rollback; logger
import degrades to noop when the file is copied standalone (T1 test).
- casan-harness.sh: debug-log each phase H4-in -> H5 -> [H2-gate] -> H6-exec
-> H4-out with its rc; optional CASAN_PHASE_REPORT JSON for the Boss.
Default level (info) keeps output close to before; behavior opt-in via env.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
