fix: drop plugin.json 'skills' key to clear path-escape error on v2.1.109 (#264)

plugin.json has declared "skills": ["./"] unchanged since v2.1.0. That
value used to work on older Claude Code but current versions reject it
with: Path escapes plugin directory: ./ (skills). The error surfaces
on fresh /doctor runs even after v3.0.3 restored the archive contents.

Fix: omit the "skills" key entirely. Every other plugin in the Claude
Code marketplace ecosystem (compound-engineering, coding-tutor, codex,
esper, 15+ Anthropic official plugins) omits this key and the loader
auto-discovers skills/*/SKILL.md. Matching that pattern clears the
path-escape error on v2.1.109+ and remains compatible with older
Claude Code versions where the default-discovery path was already the
working code path.

Co-authored-by: Matt Van Horn <455140+mvanhorn@users.noreply.github.com>

.claude-plugin/marketplace.json

@@ -10,7 +10,7 @@
     {
       "name": "last30days",
       "description": "Research any topic across Reddit, X, YouTube, TikTok, Instagram, HN, Polymarket, GitHub, and 5+ more sources.",
-      "version": "3.0.3",
+      "version": "3.0.4",
       "author": {
         "name": "Matt Van Horn",
         "url": "https://github.com/mvanhorn"

.claude-plugin/plugin.json

@@ -1,6 +1,6 @@
 {
   "name": "last30days",
-  "version": "3.0.3",
+  "version": "3.0.4",
   "description": "Research any topic across Reddit, X, YouTube, TikTok, Instagram, Hacker News, Polymarket, GitHub, and 5+ more sources. AI agent scores by upvotes, likes, and real money - not editors.",
   "author": {
     "name": "Matt Van Horn",
@@ -11,6 +11,5 @@
   "repository": "https://github.com/mvanhorn/last30days-skill",
   "license": "MIT",
   "keywords": ["research", "reddit", "twitter", "youtube", "tiktok", "instagram", "trends", "prompts", "polymarket", "github", "perplexity", "threads", "pinterest", "eli5", "hacker-news"],
-  "skills": ["./"],
   "hooks": {}
 }