Better 403 error messages

Report the model id in following error message to make it easier to identify which model is unaccessible:

❯ CLAUDE_CODE_USE_BEDROCK=1 npx @anthropic-ai/claude-code
╭───────────────────────────────────────────────────────────────────╮
│ ✻ Welcome to Claude Code research preview!                        │
│                                                                   │
│   /help for help                                                  │
│                                                                   │
│   cwd: /Users/oliver.mannion/code/ghec/dt-snowflake-data-testing  │
╰───────────────────────────────────────────────────────────────────╯

 Tips for getting started:

 1. Run /init to create a CLAUDE.md file with instructions for Claude.
 2. Use Claude to help with file analysis, editing, bash commands and git
 3. Be as specific as you would with another engineer for the best results

> /init is analyzing your codebase…
  ⎿  API Error: 403 You don't have access to the model with the specified model ID.

0.2.50 (Claude Code)