Uoink 3.9.3: MCP registry listing and HTTP tool fix

Uoink is now listed in the official MCP registry as io.github.ryanbiddy/uoink. Clients and directories that read the registry can find it.

HTTP MCP now uses the same flattened tool schemas as stdio, so HTTP clients no longer drop Uoink's tools because of their schema shape. The server still checks the exact schema for every call.

Activity reads are faster on large libraries. Median read time fell from 461 to 286 ms at 10,000 items in local runs. This release makes no data or settings changes. Installing over 3.9.2 keeps your library and saved captures.