[techflag]

Upgrade the shared Web and Desktop DSH Host, Client, and SDK packages from 0.2.1-rc.2 to 0.2.1-rc.5. Preserve the complete native conversation and the existing two narrowly scoped, checksum-locked workbench frame seams. Regenerate the official Web client roster so the upstream entry-customization menus remain available.

Pin ARM macOS and Windows tooling to the official rc.5 installers. Official Intel tooling is currently rc.4; retain that exact provenance while all npm DSH packages on Intel target rc.5.

Validation:

• Shared Web/plugin build and typecheck passed; 608 DSH lock entries pinned to rc.5.
• Desktop headless gate: 164 tests passed, 2 skipped; official release/profile checks passed.
• Shared workbench delivery: 313 tests passed; planning: 11 passed; frame patch/rollback: 3 passed.
• All three official installer archives verified against publisher sizes and SHA-512.
• Isolated Web preview starts successfully with the current source packages.
• Packaged macOS ARM runtime passed: 6 product services initialized; 304 Harness instances all rc.5. Real native main interface, workbench management/pagination and create entry verified through desktop UI automation.
• Isolated Web authentication and HTML request passed. Intel/Windows graphical acceptance has not been performed locally.

GitHub CI passed for Web, Windows, macOS ARM, macOS Intel and enterprise plugins. The initial Intel job hit the existing 30-second native-module process timeout; the failed job passed on rerun with exactly the same commit and checks. No timeout or runtime-loading gate was weakened.

No release tag or user data migration is included.