Naia v0.1.8

Windows v0.1.8 emergency patch release.

This supersedes v0.1.7 after field testing found two Windows release issues:

• Naia Host voice runtime downloads could fail with HTTP 401 because the packaged R2 public URL was incorrect.
• Updates or full uninstalls could retain installer-owned Agent/runtime dependency files, including stale node_modules.

v0.1.8 pins and live-verifies the public runtime URL before packaging (HEAD 200, byte-range 206, exact archive size), replaces installer-owned dependency trees during updates, and removes the exact Naia install root plus app-owned state on full uninstall while preserving user ~/.naia memory and workspaces.

Validated on Windows:

• 1,613 tests passed (21 skipped)
• v0.1.7 -> v0.1.8 update removed an injected stale Agent file
• ~/.naia and secure credential-store hashes were preserved across update
• installed Agent gRPC and BGM sidecar reached ready using bundled Node
• packaged Naia Host manifest points to the verified public R2 artifact

Users of v0.1.7 should update to v0.1.8.

Manual Windows installers; code signing and automatic updater metadata are not included in this release.