fix(agents): replace deprecated tool names with official namespaced equivalents 🤖🤖🤖 (#1382)

Update tools lists in tdd-red, tdd-green, tdd-refactor, and github-actions-expert
agents to use the current VS Code Copilot built-in tool names.

Old names were silently ignored by VS Code (documented behaviour: 'If a given
tool is not available when using the custom agent, it is ignored.').

Tool name mapping applied:
- github          → github/*
- findTestFiles   → search/fileSearch
- runTests        → execute/runTests
- runCommands     → execute/runInTerminal
- terminalCommand → execute/runInTerminal
- codebase        → search/codebase
- filesystem      → read/readFile
- problems        → read/problems
- testFailure     → execute/testFailure
- terminalLastCommand → read/terminalLastCommand
- githubRepo      → github/*

Also added missing tools present in the current VS Code tool reference:
- execute/getTerminalOutput
- read/terminalSelection

Additionally, generalised C#-specific content in TDD agents to be polyglot,
covering JavaScript/TypeScript (Jest/Vitest), Python (pytest), Java/Kotlin
(JUnit 5), and C# (.NET) — making the agents useful to the broader community.

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

Co-authored-by: Ming <oncwnuAUeYAFR4UGlq8BEJq8Jy-k@git.weixin.qq.com>

agents/github-actions-expert.agent.md

@@ -1,7 +1,7 @@
 ---
 name: 'GitHub Actions Expert'
 description: 'GitHub Actions specialist focused on secure CI/CD workflows, action pinning, OIDC authentication, permissions least privilege, and supply-chain security'
-tools: ['codebase', 'edit/editFiles', 'terminalCommand', 'search', 'githubRepo']
+tools: ['github/*', 'search/codebase', 'edit/editFiles', 'execute/runInTerminal', 'read/readFile', 'search/fileSearch']
 ---
 
 # GitHub Actions Expert

agents/tdd-green.agent.md

@@ -1,7 +1,7 @@
 ---
 description: 'Implement minimal code to satisfy GitHub issue requirements and make failing tests pass without over-engineering.'
 name: 'TDD Green Phase - Make Tests Pass Quickly'
-tools: ['github', 'findTestFiles', 'edit/editFiles', 'runTests', 'runCommands', 'codebase', 'filesystem', 'search', 'problems', 'testFailure', 'terminalLastCommand']
+tools: ['github/*', 'search/fileSearch', 'edit/editFiles', 'execute/runTests', 'execute/runInTerminal', 'execute/getTerminalOutput', 'execute/testFailure', 'read/readFile', 'read/terminalLastCommand', 'read/terminalSelection', 'read/problems', 'search/codebase']
 ---
 # TDD Green Phase - Make Tests Pass Quickly
 
@@ -34,11 +34,11 @@ Write the minimal code necessary to satisfy GitHub issue requirements and make f
 - **Simple solutions first** - Choose the most straightforward implementation path from issue context
 - **Defer complexity** - Don't anticipate requirements beyond current issue scope
 
-### C# Implementation Strategies
+### Implementation Strategies (Polyglot)
 - **Start with constants** - Return hard-coded values from issue examples initially
 - **Progress to conditionals** - Add if/else logic as more issue scenarios are tested
-- **Extract to methods** - Create simple helper methods when duplication emerges
+- **Extract to methods/functions** - Create simple helpers when duplication emerges
-- **Use basic collections** - Simple List<T> or Dictionary<T,V> over complex data structures
+- **Use basic collections** - Simple arrays, lists, or maps over complex data structures
 
 ## Execution Guidelines
 

agents/tdd-red.agent.md

@@ -1,7 +1,7 @@
 ---
 description: "Guide test-first development by writing failing tests that describe desired behaviour from GitHub issue context before implementation exists."
 name: "TDD Red Phase - Write Failing Tests First"
-tools: ["github", "findTestFiles", "edit/editFiles", "runTests", "runCommands", "codebase", "filesystem", "search", "problems", "testFailure", "terminalLastCommand"]
+tools: ["github/*", "search/fileSearch", "edit/editFiles", "execute/runTests", "execute/runInTerminal", "execute/getTerminalOutput", "execute/testFailure", "read/readFile", "read/terminalLastCommand", "read/terminalSelection", "read/problems", "search/codebase"]
 ---
 
 # TDD Red Phase - Write Failing Tests First
@@ -34,17 +34,19 @@ Focus on writing clear, specific failing tests that describe the desired behavio
 
 ### Test Quality Standards
 
-- **Descriptive test names** - Use clear, behaviour-focused naming like `Should_ReturnValidationError_When_EmailIsInvalid_Issue{number}`
+- **Descriptive test names** - Use clear, behaviour-focused naming like `returnsValidationError_whenEmailIsInvalid_issue{number}` (adapt casing to your language convention)
 - **AAA Pattern** - Structure tests with clear Arrange, Act, Assert sections
 - **Single assertion focus** - Each test should verify one specific outcome from issue criteria
 - **Edge cases first** - Consider boundary conditions mentioned in issue discussions
 
-### C# Test Patterns
+### Test Patterns (Polyglot)
 
-- Use **xUnit** with **FluentAssertions** for readable assertions
+- **JavaScript/TypeScript**: Use **Jest** or **Vitest** with `describe`/`it` blocks and `expect` assertions
-- Apply **AutoFixture** for test data generation
+- **Python**: Use **pytest** with descriptive function names and `assert` statements
-- Implement **Theory tests** for multiple input scenarios from issue examples
+- **Java/Kotlin**: Use **JUnit 5** with **AssertJ** for fluent assertions
-- Create **custom assertions** for domain-specific validations outlined in issue
+- **C#/.NET**: Use **xUnit** or **NUnit** with **FluentAssertions**
+- Apply parameterised/data-driven tests for multiple input scenarios from issue examples
+- Create shared test utilities for domain-specific validations outlined in issue
 
 ## Execution Guidelines
 

agents/tdd-refactor.agent.md

@@ -1,7 +1,7 @@
 ---
 description: "Improve code quality, apply security best practices, and enhance design whilst maintaining green tests and GitHub issue compliance."
 name: "TDD Refactor Phase - Improve Quality & Security"
-tools: ["github", "findTestFiles", "edit/editFiles", "runTests", "runCommands", "codebase", "filesystem", "search", "problems", "testFailure", "terminalLastCommand"]
+tools: ["github/*", "search/fileSearch", "edit/editFiles", "execute/runTests", "execute/runInTerminal", "execute/getTerminalOutput", "execute/testFailure", "read/readFile", "read/terminalLastCommand", "read/terminalSelection", "read/problems", "search/codebase"]
 ---
 
 # TDD Refactor Phase - Improve Quality & Security
@@ -39,24 +39,24 @@ Clean up code, apply security best practices, and enhance design whilst keeping
 - **Authentication/Authorisation** - Implement proper access controls if specified in issue
 - **Data protection** - Encrypt sensitive data, use secure connection strings
 - **Error handling** - Avoid information disclosure through exception details
-- **Dependency scanning** - Check for vulnerable NuGet packages
+- **Dependency scanning** - Check for vulnerable packages (`npm audit`, `pip audit`, `dotnet list package --vulnerable`, etc.)
-- **Secrets management** - Use Azure Key Vault or user secrets, never hard-code credentials
+- **Secrets management** - Use environment variables or a secrets manager; never hard-code credentials
 - **OWASP compliance** - Address security concerns mentioned in issue or related security tickets
 
 ### Design Excellence
 
 - **Design patterns** - Apply appropriate patterns (Repository, Factory, Strategy, etc.)
-- **Dependency injection** - Use DI container for loose coupling
+- **Dependency injection** - Use DI container or constructor injection for loose coupling
-- **Configuration management** - Externalise settings using IOptions pattern
+- **Configuration management** - Externalise settings using environment variables or config files
-- **Logging and monitoring** - Add structured logging with Serilog for issue troubleshooting
+- **Logging and monitoring** - Add structured logging appropriate to your stack for issue troubleshooting
-- **Performance optimisation** - Use async/await, efficient collections, caching
+- **Performance optimisation** - Use async/await or equivalent concurrency primitives, efficient collections, caching
 
-### C# Best Practices
+### Language Best Practices (Polyglot)
 
-- **Nullable reference types** - Enable and properly configure nullability
+- **Null safety** - Enable strict null checks (TypeScript), nullable reference types (C#), or Optional types (Java/Kotlin)
-- **Modern C# features** - Use pattern matching, switch expressions, records
+- **Modern language features** - Use pattern matching, destructuring, and idiomatic constructs for your language
-- **Memory efficiency** - Consider Span<T>, Memory<T> for performance-critical code
+- **Memory & performance** - Apply language-specific optimisations only when profiling reveals a bottleneck
-- **Exception handling** - Use specific exception types, avoid catching Exception
+- **Error handling** - Use specific error/exception types; avoid swallowing errors silently
 
 ## Security Checklist