chore: bump version to 2026.5.0

[sasagar]

Summary

5月の最初の安定版リリース v2026.5.0 へのバージョンバンプ。

Versions

Component	Before	After
Rox (Project, CalVer)	2026.4.1	2026.5.0
Hono Rox (Backend, SemVer)	1.5.1	1.6.0
Waku Rox (Frontend, SemVer)	1.5.1	1.6.0
Shared (SemVer)	1.5.1	1.6.0

Highlights since v2026.4.1

• Supply-chain hardening Phase 1 (chore: harden CI/CD against supply-chain attacks #164): GitHub Actions SHA固定、frozen-lockfile、最小権限、Dependabot 設定、Dependency Review
• Supply-chain hardening Phase 2 (chore: phase 2 supply-chain hardening (SBOM + provenance) #169): リリース時に SBOM (SPDX-JSON) 自動生成 + Sigstore build provenance
• Waku 1.0.0-beta.0 へアップグレード (chore: bump Waku to 1.0.0-beta.0 and audit dependencies #165) + 各 package で minor/patch 更新
• better-sqlite3 → bun:sqlite 移行 (chore: replace better-sqlite3 with bun:sqlite #167): ネイティブモジュール撤廃、CI から Node.js 削除、Bun 単一ランタイム化
• 副次: .playwright-mcp/ を gitignore に追加

Next steps

• このPRをマージ後、dev → main のRelease PRを作成して auto-tag.yml で v2026.5.0 タグとGitHub Releaseを自動作成

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📥 Commits

Reviewing files that changed from the base of the PR and between 4b9c89e and b8e7851.

📒 Files selected for processing (4)

• package.json
• packages/backend/package.json
• packages/frontend/package.json
• packages/shared/package.json

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/bump-v2026.5.0

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