D37 — Single binary with subcommands; client always HTTP (no stdio/--check/--base-dir)

Decision. cartographer-configure is eliminated: cmd/cartographer becomes a binary with subcommands (serve, version, help, plus the client subcommands agents/connect/status/ sync); with no arguments it opens a TUI dashboard in a TTY. The client always talks to the server via HTTP: the client-side stdio transport, --check (replaced by status), and --base-dir (replaced by cwd/--global) are removed. Rationale. Real deploy topologies (local Docker, multi-client k8s) have the client on a different machine from the server, or in any case connected over the network: a "direct on the filesystem" stdio transport was dead code duplicating the materialization logic. A single binary with subcommands (git/kubectl style) is more discoverable than two binaries with different flags. Details: docs/configurator.md, docs/deployment.md §Topologies.