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/claude-sonnet-4-6-cursor.json

@@ -8,7 +8,6 @@
   "runs": {
     "pelican-cycling": [
       {
-        "file": "pelican-beach.svg",
         "note": {
           "zh": "在 Cursor CLI 中以 Claude Sonnet 4.6（High 思考配额）一次生成。原始 SVG 的注释中混入非法 XML/编码字节，导致浏览器只渲染到一半并显示解析错误；Codex 仅将这些注释里的坏字符替换为 ASCII 连字符以修复加载错误，未改动任何图形元素。",
           "en": "Generated in one shot by Claude Sonnet 4.6 (High effort) inside Cursor CLI. The original SVG contained invalid XML/encoding bytes inside comments, causing browsers to stop rendering partway through with a parse error; Codex only replaced those bad comment characters with ASCII hyphens to fix loading, without changing any graphical elements."
@@ -16,7 +15,7 @@
         "contributor": "Nagi-ovo"
       },
       {
-        "file": "pelican-beach-2.svg",
+        "file": "pelican-cycling-2.svg",
         "note": {
           "zh": "第二版：在 Cursor CLI 中以 Claude Sonnet 4.6（High 思考配额）一次生成，作为独立 SVG 变体登记，保留原版产物不变。",
           "en": "Second version: generated in one shot by Claude Sonnet 4.6 (High effort) inside Cursor CLI and registered as a separate SVG variant, preserving the original artifact."