Register the Claude Code x Fable 5 Max combination as its own entry

The minecraft.html artifact is Fable 5 Max run inside Claude Code — a
different harness from the existing Claude Web App entry, so per the
model x harness x effort architecture it becomes a new combination
(claude-fable-5-code) rather than a variant. The validator now also
rejects loose files under outputs/<id>/ that no run declares, which is
how this artifact briefly slipped into the repo unregistered. OG count
refreshed (11 -> 12 ran).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

README.en.md

@@ -17,6 +17,7 @@ One-shot LLM eval cases by NAGI STUDIO: same prompt, different model x harness x
 | Model | Vendor | Harness | Effort | Runs |
 |---|---|---|---|---|
 | Claude Fable 5 | Anthropic | Claude Web App | Max | 02 |
+| Claude Fable 5 | Anthropic | Claude Code | Max | 01 |
 | GPT-5.5 Pro | OpenAI | ChatGPT Web | Extended Pro | 02 |
 | GPT-5.5 | OpenAI | Codex CLI (no skills) | xhigh | 02 |
 | Gemini 3.1 Pro | Google | AntiGravity | High | 03 |