release: v20.1.0 — star nudges & eval hardening (#52)

Bump to 20.1.0. Folds the prior Unreleased items (CI leaderboard, PR-based
results flow, faster/hang-proof evals) plus the new star CTAs into a
[20.1.0] changelog section. Updates the README version badge.


Claude-Session: https://claude.ai/code/session_016JWn5jRD5tcEFKrubjQ6Px

Co-authored-by: Claude <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "pm-claude-skills",
-  "version": "20.0.0",
+  "version": "20.1.0",
   "type": "module",
   "description": "167 professional Agent Skills (SKILL.md) + subagents + slash commands for Claude, ChatGPT, Gemini, Cursor, Codex & Hermes. Install into any AI coding tool with: npx pm-claude-skills add --agent <tool>.",
   "keywords": [