Add CoWork plugin manifest (.claude-plugin/plugin.json) — fixes #4

.claude-plugin/plugin.json and marketplace.json already existed but had
a stale skill count (106) and version (2.0.0). Updated both to 124 skills
and version 2.1.0, adding historical-thinking to the description.

README installation section updated: CoWork native plugin install moved
to the top with Customize > (+) Add Plugin instructions; claude plugin
install URL variant added to the Claude Code CLI section.

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

Author: GarethManning

.claude-plugin/marketplace.json

@@ -5,14 +5,14 @@
     "url": "https://github.com/GarethManning"
   },
   "metadata": {
-    "description": "106 evidence-based pedagogical skills for educators. Curriculum design, assessment, learning science, wellbeing, professional learning, and more.",
-    "version": "2.0.0"
+    "description": "124 evidence-based pedagogical skills for educators. Curriculum design, assessment, learning science, wellbeing, professional learning, historical thinking, and more.",
+    "version": "2.1.0"
   },
   "plugins": [
     {
       "name": "claude-education-skills",
       "description": "Evidence-based pedagogical skills covering curriculum design, assessment, learning science, student wellbeing, and professional learning.",
-      "version": "2.0.0",
+      "version": "2.1.0",
       "author": {
         "name": "Gareth Manning"
       },

.claude-plugin/plugin.json

@@ -1,8 +1,8 @@
 {
   "name": "claude-education-skills",
   "display_name": "Claude Education Skills Library",
-  "version": "2.0.0",
-  "description": "106 evidence-based pedagogical skills for educators. Curriculum design, assessment, learning science, wellbeing, professional learning, and more.",
+  "version": "2.1.0",
+  "description": "124 evidence-based pedagogical skills for educators. Curriculum design, assessment, learning science, wellbeing, professional learning, historical thinking, and more.",
   "author": {
     "name": "Gareth Manning",
     "url": "https://github.com/GarethManning"

README.md

@@ -58,15 +58,25 @@ That is one use case. The same library can power school-wide curriculum audits,
 
 ## Using the Library
 
-### Claude.ai, Claude Desktop, or Cowork (easiest)
+### CoWork (native plugin — easiest)
 
-Add the MCP server URL under Settings → Connectors:
+Go to **Customize → (+) Add Plugin** and paste the GitHub URL:
+
+```
+https://github.com/GarethManning/claude-education-skills
+```
+
+CoWork reads `.claude-plugin/plugin.json` and installs all 124 skills automatically.
+
+### Claude.ai or Claude Desktop (via MCP server)
+
+Add the MCP server URL under **Settings → Connectors**:
 
 ```
 https://mcp-server-sigma-sooty.vercel.app/mcp
 ```
 
-That's it. On first use: click the **+** icon in the message bar → select **Connectors** → find Claude Education Skills and toggle it on. After that, skills activate automatically in every conversation — no manual activation needed.
+On first use: click the **+** icon in the message bar → select **Connectors** → find Claude Education Skills and toggle it on. Skills activate automatically in every conversation — no manual activation needed.
 
 ### Claude Code (local via npx)
 
@@ -96,6 +106,12 @@ Or add it permanently to your Claude Code config:
 /plugin install claude-education-skills
 ```
 
+Or install directly from the repo URL:
+
+```
+claude plugin install https://github.com/GarethManning/claude-education-skills
+```
+
 Skills load with progressive disclosure — metadata only until a skill is actually needed.
 
 ### Remote MCP (API / programmatic)