refactor: migrate plugins to Claude Code spec format

- Move plugin manifests from .github/plugin/ to .claude-plugin/
- Convert items[] to Claude Code spec fields (agents, commands, skills)
- Rename tags to keywords, drop display/featured/instructions from plugins
- Delete all symlinks and materialized files from plugin directories
- Add eng/materialize-plugins.mjs to copy source files into plugin dirs at publish time
- Add .github/workflows/publish.yml for staged->main publishing
- Update CI triggers to target staged branch
- Update validation, creation, marketplace, and README generation scripts
- Update CONTRIBUTING.md and AGENTS.md documentation
- Include all new content from main (polyglot-test-agent, gem-browser-tester,
  fabric-lakehouse, fluentui-blazor, quasi-coder, transloadit-media-processing,
  make-repo-contribution hardening, website logo/gradient changes)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

plugins/azure-cloud-development/.github/plugin/plugin.json

@@ -7,7 +7,7 @@
   },
   "repository": "https://github.com/github/awesome-copilot",
   "license": "MIT",
-  "tags": [
+  "keywords": [
     "azure",
     "cloud",
     "infrastructure",
@@ -17,82 +17,17 @@
     "architecture",
     "devops"
   ],
-  "display": {
-    "ordering": "alpha",
-    "show_badge": true
-  },
-  "items": [
-    {
-      "path": "agents/azure-principal-architect.agent.md",
-      "kind": "agent"
-    },
-    {
-      "path": "agents/azure-saas-architect.agent.md",
-      "kind": "agent"
-    },
-    {
-      "path": "agents/azure-logic-apps-expert.agent.md",
-      "kind": "agent"
-    },
-    {
-      "path": "agents/azure-verified-modules-bicep.agent.md",
-      "kind": "agent"
-    },
-    {
-      "path": "agents/azure-verified-modules-terraform.agent.md",
-      "kind": "agent"
-    },
-    {
-      "path": "agents/terraform-azure-planning.agent.md",
-      "kind": "agent"
-    },
-    {
-      "path": "agents/terraform-azure-implement.agent.md",
-      "kind": "agent"
-    },
-    {
-      "path": "instructions/bicep-code-best-practices.instructions.md",
-      "kind": "instruction"
-    },
-    {
-      "path": "instructions/terraform.instructions.md",
-      "kind": "instruction"
-    },
-    {
-      "path": "instructions/terraform-azure.instructions.md",
-      "kind": "instruction"
-    },
-    {
-      "path": "instructions/azure-verified-modules-terraform.instructions.md",
-      "kind": "instruction"
-    },
-    {
-      "path": "instructions/azure-functions-typescript.instructions.md",
-      "kind": "instruction"
-    },
-    {
-      "path": "instructions/azure-logic-apps-power-automate.instructions.md",
-      "kind": "instruction"
-    },
-    {
-      "path": "instructions/azure-devops-pipelines.instructions.md",
-      "kind": "instruction"
-    },
-    {
-      "path": "instructions/containerization-docker-best-practices.instructions.md",
-      "kind": "instruction"
-    },
-    {
-      "path": "instructions/kubernetes-deployment-best-practices.instructions.md",
-      "kind": "instruction"
-    },
-    {
-      "path": "prompts/azure-resource-health-diagnose.prompt.md",
-      "kind": "prompt"
-    },
-    {
-      "path": "prompts/az-cost-optimize.prompt.md",
-      "kind": "prompt"
-    }
+  "agents": [
+    "./agents/azure-principal-architect.md",
+    "./agents/azure-saas-architect.md",
+    "./agents/azure-logic-apps-expert.md",
+    "./agents/azure-verified-modules-bicep.md",
+    "./agents/azure-verified-modules-terraform.md",
+    "./agents/terraform-azure-planning.md",
+    "./agents/terraform-azure-implement.md"
+  ],
+  "commands": [
+    "./commands/azure-resource-health-diagnose.md",
+    "./commands/az-cost-optimize.md"
   ]
 }

plugins/azure-cloud-development/agents/azure-logic-apps-expert.md

@@ -1 +0,0 @@
-../../../agents/azure-logic-apps-expert.agent.md

plugins/azure-cloud-development/agents/azure-principal-architect.md

@@ -1 +0,0 @@
-../../../agents/azure-principal-architect.agent.md

plugins/azure-cloud-development/agents/azure-saas-architect.md

@@ -1 +0,0 @@
-../../../agents/azure-saas-architect.agent.md

plugins/azure-cloud-development/agents/azure-verified-modules-bicep.md

@@ -1 +0,0 @@
-../../../agents/azure-verified-modules-bicep.agent.md

plugins/azure-cloud-development/agents/azure-verified-modules-terraform.md

@@ -1 +0,0 @@
-../../../agents/azure-verified-modules-terraform.agent.md

plugins/azure-cloud-development/agents/terraform-azure-implement.md

@@ -1 +0,0 @@
-../../../agents/terraform-azure-implement.agent.md

plugins/azure-cloud-development/agents/terraform-azure-planning.md

@@ -1 +0,0 @@
-../../../agents/terraform-azure-planning.agent.md

plugins/azure-cloud-development/commands/az-cost-optimize.md

@@ -1 +0,0 @@
-../../../prompts/az-cost-optimize.prompt.md

plugins/azure-cloud-development/commands/azure-resource-health-diagnose.md

@@ -1 +0,0 @@
-../../../prompts/azure-resource-health-diagnose.prompt.md