cedric/deprecate setup

[Cedric / ViaDézo1er (viadezo1er)]

Remove bt setup.
Keep a stub that says to use curl -fsSL https://braintrust.dev/wizard/setup.sh | sh instead:

❯ bt setup
bt setup has been deprecated, use the command below instead:

    curl -fsSL https://braintrust.dev/wizard/setup.sh | sh
❯ bt setup -h
Deprecated: use curl -fsSL https://braintrust.dev/wizard/setup.sh | sh

Usage: bt setup [OPTIONS]

Options:
  -h, --help  Print help

Global options:
      --json                 Output as JSON
  -v, --verbose              Increase output verbosity [env: BRAINTRUST_VERBOSE=]
  -q, --quiet                Reduce interactive UI output [env: BRAINTRUST_QUIET=]
      --no-color             Disable ANSI color output [env: BRAINTRUST_NO_COLOR=]
      --no-input             Disable all interactive prompts [env: BRAINTRUST_NO_INPUT=]
  -o, --org <ORG_NAME>       Override active org (or via BRAINTRUST_ORG_NAME) [env: BRAINTRUST_ORG_NAME=]
  -p, --project <PROJECT>    Override active project [env: BRAINTRUST_DEFAULT_PROJECT]
      --prefer-api-key       Prefer API key credentials for the selected org when available [env: BRAINTRUST_PREFER_API_KEY=]
      --api-url <API_URL>    Override API URL (or via BRAINTRUST_API_URL) [env: BRAINTRUST_API_URL]
      --app-url <APP_URL>    Override app URL (or via BRAINTRUST_APP_URL) [env: BRAINTRUST_APP_URL]
      --ca-cert <CA_CERT>    Path to a PEM-encoded CA bundle used for HTTPS requests [env: BRAINTRUST_CA_CERT]
      --env-file <ENV_FILE>  Path to a .env file to load before running commands [env: BRAINTRUST_ENV_FILE]

Based on cedric/prune-profiles from #274, will be merged after it.
For reviews, don't forget to compare against cedric/prune-profiles and not against main.

[github-actions]

Latest downloadable build artifacts for this PR commit 11e4b7bbdaa5:

• Workflow run: https://github.com/braintrustdata/bt/actions/runs/30317610021
• Download all artifacts (GitHub CLI): gh run download 30317610021 --repo braintrustdata/bt
• Installers are published from main automatically. To publish one for a PR branch, run release-canary manually via workflow_dispatch.

Available artifact names

• artifacts-build-global
• artifacts-build-local-x86_64-pc-windows-msvc
• artifacts-build-local-aarch64-pc-windows-msvc
• artifacts-build-local-x86_64-apple-darwin
• artifacts-build-local-aarch64-apple-darwin
• artifacts-build-local-x86_64-unknown-linux-musl
• artifacts-build-local-x86_64-unknown-linux-gnu
• artifacts-build-local-aarch64-unknown-linux-gnu
• artifacts-plan-dist-manifest
• cargo-dist-cache