Fix linting errors and test failures

[Copilot]

Resolves linting errors in safe_inputs.go and fixes failing unit tests in workflow compilation.

Changes

Linting fixes

• safe_inputs.go: Removed empty blocks after fmt.Sscanf calls, explicitly discarding return values to satisfy empty-block and errcheck rules

Action pins

• actions/create-github-app-token@v2: Updated SHA to match current v2 tag (7e473efe → 29824e69)

Test fixes

• step_summary_test.go: Handle empty model values using environment variable expressions instead of literal strings
• threat_detection_test.go: Support both hardcoded model values and environment variable references in detection jobs
• mcp_inspect_playwright_live_integration_test.go: Renamed test helper findAvailablePort() to findAvailableTestPort() to avoid collision with production function

// Before: violated empty-block rule
if timeoutInt, err := fmt.Sscanf(t, "%d", &toolConfig.Timeout); err == nil && timeoutInt == 1 {
    // Successfully parsed
}

// After: explicit discard
_, _ = fmt.Sscanf(t, "%d", &toolConfig.Timeout)

Original prompt

Format, lint, fix tests

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