5 docs tagged with "phase-4"

Adopt explicit preview/staging/production tiers with immutable builds and environment-aware configuration to strengthen deployment credibility and operational safety.

Multi-environment deployment, performance optimization, security hardening, and operational maturity to elevate the Portfolio Program from professional to enterprise-grade.

Phase 4 completion release note covering observability, security hardening, runbooks, and UX/SEO documentation upgrades.

Procedures for promoting code from staging to production environments with validation gates and deployment checks.

Procedures for rolling back failed promotions and recovering from deployment issues across staging and production.