Add ai-team-orchestration plugin: multi-agent dev team with Producer, Dev Team, QA agents (#1504)

* Add ai-team-orchestration plugin: multi-agent dev team with Producer, Dev Team, QA agents

* fix: use kebab-case agent names to match filenames

* fix: regenerate README after agent name change

* fix: address Copilot review — add edit tools to Producer/QA, use GitHub closing keywords

* fix: update agent tools to official VS Code tool set names

Replace outdated/nonexistent tool names with current official tool sets:
- Producer: search, read, edit, web (removed nonexistent githubRepo)
- Dev Team: search, read, edit, execute, web (replaced runCommands, problems, usages, etc.)
- QA: search, read, edit, execute, web (removed nonexistent findTestFiles, runTests)

Ref: https://code.visualstudio.com/docs/copilot/reference/copilot-vscode-features#_chat-tools

* fix: remove frontmatter from plugin README per reviewer feedback

---------

Co-authored-by: Aaron Powell <me@aaron-powell.com>

.github/plugin/marketplace.json

@@ -10,6 +10,12 @@
     "email": "copilot@github.com"
   },
   "plugins": [
+    {
+      "name": "ai-team-orchestration",
+      "source": "ai-team-orchestration",
+      "description": "Bootstrap and run a multi-agent AI development team with named roles (Producer, Dev Team, QA). Sprint planning, brainstorm prompts with distinct agent voices, cross-chat context survival, and parallel team workflows. Based on a proven template that shipped a 30-game app in 5 days with zero human-written code.",
+      "version": "1.0.0"
+    },
     {
       "name": "arize-ax",
       "source": "arize-ax",