Normalize artifact filenames and register new runs (#17)

Rename all output artifacts to their canonical case-id names
(mythos-craft.html / pelican-cycling.svg / skeleton-watch.html, with
-2 suffixes for variants) and drop the now-redundant "file" overrides
from the corresponding models/*.json runs.

Register new Claude Code runs for Opus 4.6 and 4.7 (new model JSONs),
add the GPT-5.5 Pro skeleton-watch run, and regenerate the README
registry tables. Remove stray .DS_Store files from outputs/.

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

models/gpt-5-3-codex-cursor.json

@@ -7,7 +7,6 @@
   "order": 32,
   "runs": {
     "mythos-craft": {
-      "file": "mythic-craft.html",
       "note": {
         "zh": "在 Cursor CLI 中以 GPT-5.3 Codex（xhigh 思考配额）一次生成；本页为未经修改的原始产出。",
         "en": "Generated in one shot by GPT-5.3 Codex (xhigh effort) inside Cursor CLI; unmodified original output."