fix: triage all 16 open GitHub issues — close 9, fix 6, comment 1

Batch 1 (closed): #43 spam, #34 dup, #19 resolved, #2 resolved, #41 answered
Batch 2: Added MIT LICENSE file (#35), closed #42 (license question)
Batch 3 code fixes:
  - #29: YouTube skip reason shows "0 results" instead of "not installed"
  - #30: Bird source mapping handles reddit-web + Bird combo
  - #39: watchlist.py extracts YouTube + TikTok findings, run-one prints output
  - #40: watchlist.py uses search_queries field when available
Batch 4:
  - #32: marketplace.json source "." → "./" with $schema ref
  - #36: commented with investigation plan ($ARGUMENTS forwarding)
  - #4: Added SSL troubleshooting section to README
Also commented on #22 (Bird features) and #31 (skills.sh audit).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.claude-plugin/marketplace.json

@@ -1,4 +1,5 @@
 {
+  "$schema": "https://anthropic.com/claude-code/marketplace.schema.json",
   "name": "last30days",
   "owner": {
     "name": "mvanhorn",
@@ -11,7 +12,7 @@
   "plugins": [
     {
       "name": "last30days",
-      "source": "."
+      "source": "./"
     }
   ]
 }