feat: add run replay for archetype effectiveness analysis

- archeflow-decision.sh records decision points during runs
- archeflow-replay.sh: timeline, whatif, compare commands
- What-if replay with adjustable archetype weights
- /af-replay skill for interactive use
- Tests in archeflow-replay.bats

README.md

@@ -194,11 +194,13 @@ ArcheFlow ships with 19 skills organized by function. The `run` skill is self-co
 
 ## Library Scripts
 
-Eight shell scripts in `lib/` power the process infrastructure.
+Ten shell scripts in `lib/` power the process infrastructure.
 
 | Script | Purpose | Usage |
 |--------|---------|-------|
 | `archeflow-event.sh` | Append structured JSONL events to a run log | `archeflow-event.sh <run_id> <type> <phase> <agent> '<json>'` |
+| `archeflow-decision.sh` | Log a `decision.point` (phase, archetype, input, decision, confidence) | `archeflow-decision.sh <run_id> check guardian 'diff' 'needs_changes' 0.85` |
+| `archeflow-replay.sh` | Timeline + weighted what-if over recorded verdicts | `archeflow-replay.sh compare <run_id> --weights sage=2,guardian=1` |
 | `archeflow-dag.sh` | Render ASCII DAG from JSONL events | `archeflow-dag.sh events.jsonl --color` |
 | `archeflow-report.sh` | Generate Markdown process report | `archeflow-report.sh events.jsonl --output report.md --dag` |
 | `archeflow-progress.sh` | Regenerate live progress file from events | `archeflow-progress.sh <run_id>` |