[Sync] Update project files from source repository (9a0bdd0)

[mrz1836]

What Changed

• Updated GOVULNCHECK_GO_VERSION from 1.25.5 to 1.25.6 in .github/.env.base
• Updated MAGE_X_VERSION from v1.17.4 to v1.18.1 in .github/.env.base
• Added new configuration variable GO_BROADCAST_AI_FAIL_ON_ERROR=false with documentation explaining error handling behavior for AI failures
• Removed deprecated composite action .github/actions/test-statistics/action.yml (marked as deprecated in favor of magex native CI mode)
• Removed composite actions .github/actions/cancel-workflow-on-failure/action.yml and .github/actions/download-artifact-resilient/action.yml
• Modified multiple GitHub workflow files (30 files total including workflow definitions for CodeQL, Fortress, Dependabot, and other CI/CD processes)

Why It Was Necessary

• Upgrading govulncheck to Go 1.25.6 ensures accurate vulnerability detection with the latest Go toolchain fixes
• Upgrading mage-x to v1.18.1 brings in newer CI capabilities and bug fixes that eliminate the need for custom composite actions
• Adding GO_BROADCAST_AI_FAIL_ON_ERROR provides explicit control over error handling when AI services fail, allowing users to choose between fail-fast and silent fallback behavior
• Removing deprecated composite actions simplifies the CI infrastructure by consolidating functionality into the updated mage-x version

Testing Performed

• Verify all GitHub Actions workflows parse successfully with updated configurations
• Confirm mage-x v1.18.1 CI mode produces expected .mage-x/ci-results.jsonl output replacing the removed test-statistics action
• Test govulncheck with Go 1.25.6 completes vulnerability scanning without errors
• Validate GO_BROADCAST_AI_FAIL_ON_ERROR configuration is properly read and applied in broadcast functionality

Impact / Risk

• Low Risk: Version bumps are incremental and the deprecated actions were already marked for removal
• Breaking Change: Workflows relying on the removed composite actions must use mage-x native CI mode (already the recommended approach)
• Dependency: All CI pipelines now depend on mage-x v1.18.1 behavior for test statistics and workflow management
• Configuration: New GO_BROADCAST_AI_FAIL_ON_ERROR defaults to false maintaining backwards-compatible silent fallback behavior

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[mrz1836]

LGTM!