release: DevEnv Manager v1.9.3

[weidonglang]

Summary

• bump application metadata to v1.9.3 after merging the workflow feedback fixes from fix: improve workbench action feedback and workflows #146
• publish exact NSIS/MSI identity in both update manifests, README, changelog, and release review
• document the real-Tauri Runtime health smoke and risk-driven validation boundary

Product source and assets

• exact product source: 8161743f100c975addd281ee08c24541ef3178e0
• NSIS: DevEnv.Manager_1.9.3_x64-setup.exe, 2,958,792 bytes, SHA256 55674a8f6fae2b30ac1649f09066b29ae5c8822fbd77286c4e422f7892292118
• MSI: DevEnv.Manager_1.9.3_x64_en-US.msi, 4,943,872 bytes, SHA256 81602c1c65c2c3674bab6e2a3c532533f2bde8da6a0c5d3d7267c763d5238ac5
• both installers are x64 and not Authenticode-signed, matching the documented disclosure

Verification

• Rust tests: 230 passed
• Rust Clippy and formatting: passed
• frontend production build: 113 modules
• frontend acceptance: 278 selectors
• Edge visual acceptance: 30/30 passed
• feature acceptance: 300 total, 254 passed, 0 failed, 40 safety skips, 6 manual/policy records
• repository hygiene, release consistency, update lifecycle, i18n, safety wording, and command/data/action contracts: passed
• exact release EXE smoke: About 1.9.3 / Windows x64; Runtime 2 managed, 25 external, 20/27 healthy with visible per-item health/failure details

No installer lifecycle or UAC mutation matrix was repeated because the product delta is frontend feedback/navigation and version metadata; installer, migration, backend mutation, and token contracts are unchanged.

Issues #130 and #133 remain open because they contain explicit follow-up work.