chore: add .cursor-plugin/plugin.json manifest

PR #4 onboarded the repo to standards 1.10.0 but never added the plugin
manifest, so the ecosystem drift checker still classified the repo as
'unknown' (_detect_repo_type keys off .cursor-plugin/plugin.json). That
left stale.yml and the @v1.15 refs present but unenforced, and mismatched
the registry's "cursor-plugin" type.

- Add .cursor-plugin/plugin.json per the scaffold standard (name,
  displayName, description, version, author, license, keywords, and the
  12 skill + 6 rule component paths). _detect_repo_type now returns
  cursor-plugin.
- AGENTS.md: the overview asserted "no .cursor-plugin/plugin.json" as a
  fact; updated to state the manifest now ships and why (drift-checker
  classification).

Verified locally with the meta-repo drift checker against this tree:
repo_type=cursor-plugin, 0 errors / 0 warnings, required-workflows and
required-refs both evaluated and passing.

Signed-off-by: fOuttaMyPaint <TMhospitalitystrategies@gmail.com>

Author: TMHSDigital

.cursor-plugin/plugin.json

@@ -0,0 +1,38 @@
+{
+  "name": "blender-developer-tools",
+  "displayName": "Blender Developer Tools",
+  "description": "Cursor and Claude Code skills, rules, snippets, and templates for Blender Python add-on and scripting development",
+  "version": "0.2.3",
+  "author": {
+    "name": "TMHSDigital",
+    "email": "contact@users.noreply.github.com"
+  },
+  "license": "CC-BY-NC-ND-4.0",
+  "keywords": [
+    "cursor-plugin",
+    "developer-tools",
+    "blender"
+  ],
+  "skills": [
+    "skills/addon-scaffolding/SKILL.md",
+    "skills/operators/SKILL.md",
+    "skills/ui-panels/SKILL.md",
+    "skills/custom-properties/SKILL.md",
+    "skills/mesh-editing-and-bmesh/SKILL.md",
+    "skills/headless-batch-scripting/SKILL.md",
+    "skills/slotted-actions-animation/SKILL.md",
+    "skills/geometry-nodes-python/SKILL.md",
+    "skills/procedural-materials-and-shaders/SKILL.md",
+    "skills/depsgraph-and-evaluated-data/SKILL.md",
+    "skills/drivers-and-app-handlers/SKILL.md",
+    "skills/bl-info-migration/SKILL.md"
+  ],
+  "rules": [
+    "rules/prefer-data-over-ops-in-loops.mdc",
+    "rules/always-free-bmesh.mdc",
+    "rules/target-extensions-platform-format.mdc",
+    "rules/type-annotate-props-and-defend-context.mdc",
+    "rules/prefer-temp-override-over-context-copy.mdc",
+    "rules/use-foreach-set-for-bulk-data.mdc"
+  ]
+}

AGENTS.md

@@ -8,9 +8,10 @@ Guidance for AI coding agents working on the Blender Developer Tools repository.
 
 Skills, rules, snippets, and a starter template for Blender Python development.
 The repo targets **Blender 5.1** (current stable) with a **Blender 4.5 LTS**
-fallback. There is no MCP server and no `.cursor-plugin/plugin.json`. This is
-content the AI loads when the user asks Blender questions or works on Blender
-add-ons in Cursor or Claude Code.
+fallback. There is no MCP server. It ships a `.cursor-plugin/plugin.json`
+manifest so the ecosystem drift checker classifies it as a `cursor-plugin`.
+This is content the AI loads when the user asks Blender questions or works on
+Blender add-ons in Cursor or Claude Code.
 
 The content base as of v0.2.0: