fix: bump @coder/mux-md-client to 0.1.0-main.32

[ibetitsmike]

Summary

Bumps @coder/mux-md-client from 0.1.0-main.29 to 0.1.0-main.32, picking up the @noble/ed25519 v3 hash config fix from https://github.com/coder/mux-md/pull/38.

Problem

Mux crashes on startup because @coder/mux-md-client's signing.ts uses the v2 ed.etc.sha512Sync pattern, which throws on @noble/ed25519 v3 (frozen ed.etc object):

TypeError: Cannot add property sha512Sync, object is not extensible
    at Object.<anonymous> (@coder/mux-md-client/src/signing.ts:14:17)

Since signingService.ts imports @coder/mux-md-client at the top level, this takes down the server.

Fix

Dependency bump only — the actual code fix is in @coder/mux-md-client@0.1.0-main.32.