• Merge pull request #1150 from kaitranntt/kai/refactor/1135-structural-maintainability
• fix(config-facade): mtime-based staleness detection for cache
• docs(config-facade): clarify cache coherence contract
• fix: remove raw write re-exports from facade (cache bypass)
• fix: round 3 red-team — test false-positive, dead code, edge-case coverage
• fix: round 2 red-team fixes — onRetry safety, validation, barrel
• fix: address red-team review findings — cache aliasing, jitter cap, cause shadowing
• Merge branch 'kai/refactor/1135-item2-config-loader-facade' into kai/refactor/1135-structural-maintainability
• Merge branch 'kai/refactor/1135-item9-error-hierarchy-retry' into kai/refactor/1135-structural-maintainability
• Revert "Revert "refactor(config): reorganize unified-config-types into schemas directory""
• Revert "Revert "refactor(config): reorganize unified-config-types into schemas directory""
• refactor(config): add config-loader-facade with memoization
• Revert "refactor(config): reorganize unified-config-types into schemas directory"
• refactor(config): reorganize unified-config-types into schemas directory
• refactor(errors): add RetryableError and retry-strategy utility