Add implementation and usage instruction prompts for VS Code components

.github/prompts/extract-impl-instructions.prompt.md

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+---
+mode: edit
+---
+
+Analyze the specified part of the VS Code Python Extension codebase to generate or update implementation instructions in `.github/instructions/<component>.instructions.md`.
+
+## Task
+
+Create concise developer guidance focused on:
+
+### Implementation Essentials
+
+-   **Core patterns**: How this component is typically implemented and extended
+-   **Key interfaces**: Essential classes, services, and APIs with usage examples
+-   **Integration points**: How this component interacts with other extension parts
+-   **Common tasks**: Typical development scenarios with step-by-step guidance
+
+### Content Structure
+
+````markdown
+---
+description: 'Implementation guide for the <component> part of the Python Extension'
+---
+
+# <Component> Implementation Guide
+
+## Overview
+
+Brief description of the component's purpose and role in VS Code Python Extension.
+
+## Key Concepts
+
+-   Main abstractions and their responsibilities
+-   Important interfaces and base classes
+
+## Common Implementation Patterns
+
+### Pattern 1: [Specific Use Case]
+
+```typescript
+// Code example showing typical implementation
+```
+````
+
+### Pattern 2: [Another Use Case]
+
+```typescript
+// Another practical example
+```
+
+## Integration Points
+
+-   How this component connects to other VS Code Python Extension systems
+-   Required services and dependencies
+-   Extension points and contribution models
+
+## Essential APIs
+
+-   Key methods and interfaces developers need
+-   Common parameters and return types
+
+## Gotchas and Best Practices
+
+-   Non-obvious behaviors to watch for
+-   Performance considerations
+-   Common mistakes to avoid
+
+```
+
+## Guidelines
+- **Be specific**: Use actual class names, method signatures, and file paths
+- **Show examples**: Include working code snippets from the codebase
+- **Target implementation**: Focus on how to build with/extend this component
+- **Keep it actionable**: Every section should help developers accomplish tasks
+
+Source conventions from existing `.github/instructions/*.instructions.md`, `CONTRIBUTING.md`, and codebase patterns.
+
+If `.github/instructions/<component>.instructions.md` exists, intelligently merge new insights with existing content.
+```

.github/prompts/extract-usage-instructions.prompt.md

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+---
+mode: edit
+---
+
+Analyze the user requested part of the codebase (use a suitable <placeholder>) to generate or update `.github/instructions/<placeholder>.instructions.md` for guiding developers and AI coding agents.
+
+Focus on practical usage patterns and essential knowledge:
+
+-   How to use, extend, or integrate with this code area
+-   Key architectural patterns and conventions specific to this area
+-   Common implementation patterns with code examples
+-   Integration points and typical interaction patterns with other components
+-   Essential gotchas and non-obvious behaviors
+
+Source existing conventions from `.github/instructions/*.instructions.md`, `CONTRIBUTING.md`, and `README.md`.
+
+Guidelines:
+
+-   Write concise, actionable instructions using markdown structure
+-   Document discoverable patterns with concrete examples
+-   If `.github/instructions/<placeholder>.instructions.md` exists, merge intelligently
+-   Target developers who need to work with or extend this code area
+
+Update `.github/instructions/<placeholder>.instructions.md` with header:
+
+```
+---
+description: "How to work with the <placeholder> part of the codebase"
+---
+```