Add graceful fallback for missing /v1/models endpoint

Add automatic credential suppression to prevent auth warnings

Remove OS keychain storage feature from documentation

Add interactive model configurator and improve README

Fix migration system to use CLI version tracking

Fix install script to use correct command syntax

Add encrypted file-based keyring for API key storage

Simplify README and add API mode documentation

Set model environment variables for API mode

Centralize migration logic into migrations manager

Use API-provided recommendation field instead of string matching

Add API key authentication support with custom base URL

Update README with heavy-model configuration

Add heavy model support and update environment variables for Claude Code

Replace deprecated ANTHROPIC_SMALL_FAST_MODEL with ANTHROPIC_DEFAULT_HAIKU_MODEL