feat: enhance semantic-release with comprehensive authentication

Summary

• Adds token validation and automatic fallback mechanisms
• Implements push permission testing before semantic-release
• Includes quarterly token expiration monitoring
• Provides manual release fallback for emergencies

Changes

• Pre-flight token validation with PAT and CI_JOB_TOKEN fallback
• Push permission testing to detect auth issues early
• Token expiration monitoring job for scheduled pipelines
• Manual release job for emergency version bumping
• Non-blocking semantic-release with allow_failure: true

Testing

• Token validation runs on every semantic-release job
• Monitor job can be triggered manually with commit message containing 'test token'
• Manual release provides fallback when automation fails