Add Copilot configuration files

.github/agents/psresourceget-bugfix.agent.md

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+---
+description: "Repository-aware bug-fix mode for PSResourceGet."
+model: GPT-4.1
+---
+
+# PSResourceGet bug-fix mode
+
+You are working in the PSResourceGet repository.
+
+Follow these rules:
+- Start by identifying the exact files and tests involved in the bug.
+- Prefer minimal scope and root-cause fixes over broad refactors.
+- Validate the relevant build or Pester tests before finishing.
+- Preserve PowerShell compatibility and current module behavior.
+- Keep the change aligned with the project patterns in `src/`, `test/`, and the build scripts.
+
+When a fix is required:
+1. Investigate the root cause.
+2. Add or update the smallest appropriate test.
+3. Implement the fix.
+4. Run the narrowest relevant validation command.
+5. Report the result with evidence.

.github/copilot-instructions.md

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+# Copilot instructions for PSResourceGet
+
+## Project context
+- This repository contains `Microsoft.PowerShell.PSResourceGet`, a PowerShell module for discovering, installing, updating, and publishing PowerShell resources.
+- Source code lives under `src/code` and the compiled module is packaged from `src/Microsoft.PowerShell.PSResourceGet.psm1` and related assets.
+- Tests live under `test/` and are typically PowerShell-based Pester tests.
+
+## Build and validation
+- Build the .NET project with:
+  - `dotnet build src/code /property:GenerateFullPaths=true /consoleloggerparameters:NoSummary`
+- For repo-local builds that match the project tasks, prefer the existing build definitions in `.vscode/tasks.json`.
+- Run focused validation with PowerShell/Pester for the relevant test area before claiming a fix is complete.
+- If a change affects packaging or module behavior, validate the relevant Pester files in `test/` and ensure the build still succeeds.
+
+## Coding guidance
+- Keep changes aligned with the existing PowerShell module and .NET project conventions.
+- Favor small, targeted fixes with clear names and minimal scope.
+- Preserve compatibility with supported PowerShell versions and the current public module behavior.
+- Prefer existing helper patterns and repository conventions over introducing new abstractions.
+
+## Scope for agent work
+- When asked to fix a bug, first identify the relevant files and tests, then implement the minimum fix that addresses the root cause.
+- When adding or modifying behavior, make sure the corresponding tests reflect the change and remain realistic.
+- When working on release or package concerns, respect repository build scripts and the module packaging expectations under `src/`.

.github/instructions/psresourceget.instructions.md

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+---
+applyTo: "src/**/*.cs,src/**/*.ps1,test/**/*.ps1,**/*.psm1,**/*.psd1,**/*.md"
+---
+
+# PSResourceGet repository instructions
+
+- Treat this repo as the PowerShell module `Microsoft.PowerShell.PSResourceGet`.
+- Favor small, targeted fixes that match the existing module and .NET conventions.
+- Preserve compatibility with supported PowerShell versions and public behavior.
+- Prefer repo-local build and validation commands before introducing new workflows.
+- When fixing issues, identify the root cause, add or update the relevant test, and validate the narrowest scope possible.
+- Keep changes limited to the issue being addressed; avoid unrelated refactors.
+- For packaging or module behavior changes, validate the relevant Pester files under `test/` and ensure the project still builds.

.github/prompts/psresourceget-fix.prompt.md

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+---
+mode: agent
+description: "Fix a PSResourceGet issue using the repository's build, test, and module conventions."
+---
+
+# PSResourceGet fix workflow
+
+Use this workflow when fixing a bug, regression, or issue in `Microsoft.PowerShell.PSResourceGet`.
+
+1. Locate the relevant code and tests in `src/` and `test/`.
+2. Identify the root cause and confirm which behavior is currently failing.
+3. Add or update the smallest realistic test that captures the issue.
+4. Implement the minimal code fix that addresses the root cause.
+5. Validate with the focused build or test command for the affected area.
+6. Summarize the change and evidence.
+
+Repository-specific expectations:
+- Prefer `dotnet build src/code /property:GenerateFullPaths=true /consoleloggerparameters:NoSummary` for the .NET build.
+- Use PowerShell/Pester tests in `test/` for behavioral validation where relevant.
+- Keep the fix aligned with the existing module conventions and public contract.
+- Avoid broad refactors or unrelated cleanup while the bug is being fixed.