fix: support offline replica DSL without strictNullChecks

[rdlabo]

Summary

• preserve exact-key and primitive-affinity checks when a consumer has strictNullChecks disabled
• degrade only compile-time nullability matching, because TypeScript erases nullability in that mode
• add a non-strict consumer type compilation regression test

Context

Tipsys PR #223 uses the offline replica DSL from 21.4.3 while its existing app tsconfig has strictNullChecks=false. The current conditional therefore classifies every property as nullable and rejects valid required column builders.

Verification

• npm run prebuild:kit
• npx tsc -p projects/kit/offline/tsconfig.nonstrict-null.json

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 1 additional finding.

[rdlabo]

レビューサイクル完了

• 上長レビュー: APPROVED
• 第三者受入レビュー: APPROVED
• 後方互換: runtime descriptor / DDL / public API は不変。strict consumer の nullability lock を維持
• non-strict consumer: required/nullable builders、exact keys、primitive affinity の型回帰テストを追加
• CI: lint、kit含むtest matrix、e2e、test-actions、専用 non-strict type compile が全て成功

blocking はありません。Readyです。