feat: add flowstudio-power-automate-debug and flowstudio-power-automate-build skills (#899)

* feat: add flowstudio-power-automate-debug and flowstudio-power-automate-build skills

Two companion skills for the FlowStudio Power Automate MCP server:

- flowstudio-power-automate-debug: Debug workflow for failed Power Automate cloud flow runs
- flowstudio-power-automate-build: Build & deploy flows from natural language descriptions

Both require a FlowStudio MCP subscription: https://flowstudio.app
These complement the existing flowstudio-power-automate-mcp skill (merged in PR #896).

* fix: address all review comments — README, cross-refs, response shapes, step numbering

- Add skills to docs/README.skills.md (fixes validate-readme CI check)
- Update cross-skill references to use flowstudio- prefix (#1, #4, #7, #9)
- Fix get_live_flow_run_action_outputs: returns array, index [0] (#2, #3)
- Renumber Step 6→5, Step 7→6 — remove gap in build workflow (#8)
- Fix connectionName note: it's the key, not the GUID (#10)
- Remove invalid arrow function from Filter array expression (#11)

* feat: add flowstudio-power-automate plugin bundling all 3 skills

Plugin bundles:
- flowstudio-power-automate-mcp (core connection & CRUD)
- flowstudio-power-automate-debug (debug failed runs)
- flowstudio-power-automate-build (build & deploy flows)

Install: copilot plugin install flowstudio-power-automate@awesome-copilot

Per @aaronpowell's suggestion in review.

plugins/flowstudio-power-automate/README.md

@@ -0,0 +1,37 @@
+# FlowStudio Power Automate Plugin
+
+Complete toolkit for managing Power Automate cloud flows via the FlowStudio MCP server. Connect, debug, and build/deploy flows using AI agents.
+
+Requires a FlowStudio MCP subscription — see https://flowstudio.app
+
+## Installation
+
+```bash
+# Using Copilot CLI
+copilot plugin install flowstudio-power-automate@awesome-copilot
+```
+
+## What's Included
+
+### Skills
+
+| Skill | Description |
+|-------|-------------|
+| `flowstudio-power-automate-mcp` | Core connection setup, tool discovery, and CRUD operations for Power Automate cloud flows via the FlowStudio MCP server. |
+| `flowstudio-power-automate-debug` | Step-by-step diagnostic workflow for investigating and fixing failing Power Automate cloud flow runs. |
+| `flowstudio-power-automate-build` | Build, scaffold, and deploy Power Automate cloud flows from natural language descriptions with bundled action pattern templates. |
+
+## Getting Started
+
+1. Install the plugin
+2. Subscribe to FlowStudio MCP at https://flowstudio.app
+3. Configure your MCP connection with the JWT from your workspace
+4. Ask Copilot to list your flows, debug a failure, or build a new flow
+
+## Source
+
+This plugin is part of [Awesome Copilot](https://github.com/github/awesome-copilot), a community-driven collection of GitHub Copilot extensions.
+
+## License
+
+MIT