Add test coverage assessment prompt

.github/prompts/test-coverage-assessment.prompt.md

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+# Test Coverage Assessment
+
+You are an expert Java developer tasked with analyzing test coverage for this Java SDK. Your goal is to produce a comprehensive report of what is tested and what gaps exist.
+
+## Objective
+
+Analyze the test coverage of the SDK by examining:
+1. **Event types** - All session events defined in `SessionEventParser`
+2. **Hook types** - All hooks defined in `SessionHooks`
+3. **Core functionality** - Session management, tools, permissions, etc.
+
+## Assessment Process
+
+### Step 1: Identify All Testable Components
+
+First, examine the source code to identify all components that should be tested:
+
+```bash
+# List all event classes
+ls src/main/java/com/github/copilot/sdk/events/
+
+# Check the event type mapping in SessionEventParser
+grep -n "TYPE_MAP.put" src/main/java/com/github/copilot/sdk/events/SessionEventParser.java
+```
+
+Extract the list of all registered event types from `SessionEventParser.java`.
+
+### Step 2: Identify All Hook Types
+
+Check `SessionHooks.java` for all available hook handlers:
+
+```bash
+grep -E "private.*Handler" src/main/java/com/github/copilot/sdk/json/SessionHooks.java
+```
+
+### Step 3: Analyze Existing Tests
+
+Examine the test files to understand current coverage:
+
+```bash
+# List all test files
+ls src/test/java/com/github/copilot/sdk/
+
+# Check for event-related tests
+grep -r "import.*events\." src/test/java/com/github/copilot/sdk/ | grep -v "\.class"
+
+# Check for hook tests
+grep -l "SessionHooks\|Hook" src/test/java/com/github/copilot/sdk/*.java
+```
+
+### Step 4: Categorize Test Coverage
+
+For each component, determine:
+- **Unit Test Coverage**: Tests that verify JSON parsing/serialization without E2E flow
+- **E2E Test Coverage**: Tests that verify the component works in a real session flow
+
+## Report Format
+
+Generate a comprehensive report in the following format:
+
+### Event Types Coverage
+
+| Event Type | Event Class | Unit Test | E2E Test | Notes |
+|------------|-------------|:---------:|:--------:|-------|
+| `session.start` | `SessionStartEvent` | ✅/❌ | ✅/❌ | Any notes |
+| ... | ... | ... | ... | ... |
+
+### Hook Types Coverage
+
+| Hook Type | Handler Interface | Unit Test | E2E Test | Notes |
+|-----------|-------------------|:---------:|:--------:|-------|
+| `preToolUse` | `PreToolUseHandler` | ✅/❌ | ✅/❌ | Any notes |
+| ... | ... | ... | ... | ... |
+
+### Coverage Summary
+
+| Category | Total | Unit Tested | E2E Tested | Coverage % |
+|----------|-------|-------------|------------|------------|
+| Events | X | X | X | X% |
+| Hooks | X | X | X | X% |
+
+### Gaps Identified
+
+List components that lack tests:
+1. **Missing Unit Tests**: Components without JSON parsing tests
+2. **Missing E2E Tests**: Components not exercised in integration tests
+3. **Partially Tested**: Components with incomplete test coverage
+
+### Recommendations
+
+Prioritized list of tests to add:
+1. High priority: Critical paths without coverage
+2. Medium priority: Common use cases without coverage
+3. Low priority: Edge cases and rare events
+
+## Key Files to Examine
+
+- `src/main/java/com/github/copilot/sdk/events/SessionEventParser.java` - Event type registry
+- `src/main/java/com/github/copilot/sdk/json/SessionHooks.java` - Hook definitions
+- `src/main/java/com/github/copilot/sdk/CopilotSession.java` - Hook handling logic
+- `src/test/java/com/github/copilot/sdk/SessionEventParserTest.java` - Event parsing tests
+- `src/test/java/com/github/copilot/sdk/SessionEventsE2ETest.java` - Event E2E tests
+- `src/test/java/com/github/copilot/sdk/HooksTest.java` - Hook tests
+- `src/test/java/com/github/copilot/sdk/SessionEventHandlingTest.java` - Event handling tests
+
+## Verification
+
+After producing the report, verify by running:
+
+```bash
+# Count total tests
+mvn test 2>&1 | grep "Tests run:"
+
+# Run specific test categories
+mvn test -Dtest=SessionEventParserTest
+mvn test -Dtest=SessionEventsE2ETest
+mvn test -Dtest=HooksTest
+```
+
+## Output
+
+Provide:
+1. The complete coverage report in markdown table format
+2. A prioritized list of recommended improvements
+3. Optionally: Skeleton test code for missing high-priority tests