chore(make): add a debugger target that builds the host in dev mode

[decrypto21]

Adds a make debugger target that starts the wire debugger against a host that can actually reach it.

Why: make dev cannot drive the debugger. dotli ships only build and preview, both production builds, and the dial sits behind import.meta.env.DEV, which a production bundle replaces with false. The host then never dials, the board stays empty, and nothing reports why. Getting frames today means knowing to set NODE_ENV=development by hand, which appears in no target and no README.

How: Makefile builds the dotli host in dev mode, then runs the debugger, the host preview and the playground together.

• Builds with NODE_ENV=development so the dial survives into the bundle.
• Serves apps/host/dist through scripts/preview-server.ts directly rather than dotli's preview:debug, which would turbo run build again in production and undo the dev build.
• Runs the debugger from the workspace (bun run src/server.ts), so nothing depends on @parity/truapi-debugger being published: inside the monorepo @parity/truapi resolves to the workspace copy, which carries the ./wire-decode entry point the decoder needs.
• Prints the debugger URL, the host URL, and the one-time localStorage line, naming the origin it has to be set on. That key is per-origin and per browser profile, so a value set anywhere else is invisible and the host stays silent by design.
• DEBUGGER_PORT overrides the default 9231.

The localStorage step is still manual because the dotli pin on main predates the build-time dial seeding. When that pin moves the target can pass the URL at build time and the step goes away.