Add web research skill implementation plan + un-ignore committed skills

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

.gitignore

@@ -4,8 +4,12 @@ pdfs/
 # Generated OCR worklist (regenerated each run)
 needs-ocr.txt
 
-# Claude Code session/harness state
-.claude/
+# Claude Code session/harness state (but version committed skills)
+.claude/*
+!.claude/skills/
+.claude/skills/*
+!.claude/skills/research/
+!.claude/skills/research/**
 
 # Python
 .venv/