feat: add af-status, af-score, af-dag, af-report slash command skills

skills/af-score/SKILL.md

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+---
+name: af-score
+description: |
+  Show archetype effectiveness scores across runs.
+  <example>User: "/af-score"</example>
+---
+
+# ArcheFlow Effectiveness Scores
+
+1. Run `./lib/archeflow-score.sh list` if the script exists. Display its output.
+2. If the script does not exist, read `.archeflow/memory/effectiveness.jsonl` directly.
+3. Summarize per archetype as a table:
+
+| Archetype | Runs | Signal/Noise | Fix Rate | Avg Cost |
+|-----------|------|--------------|----------|----------|
+| Guardian  | ...  | ...          | ...      | ...      |
+| Skeptic   | ...  | ...          | ...      | ...      |
+
+- **Signal/Noise**: findings that led to actual fixes vs total findings raised.
+- **Fix Rate**: percentage of findings that were applied (not dismissed).
+- **Avg Cost**: mean token cost per review across runs.
+
+4. If no effectiveness data exists, say: "No effectiveness data yet. Run `/af-run` at least once."