v0.2.12

Fix OAuth token exchange and add config-driven OAuth settings

Fixed

• OAuth token exchange failing with 401 due to CloudFront Lambda proxy rejecting Authorization: Basic header

Added

• get_token_dir() and get_callback_port() config helpers in config.py
• token_dir and callback_port client settings in config.yaml
• OAuth token storage encryption key setup instructions in SETUP.md
• WSL2 browser interop instructions in SETUP.md
• docs/oauth-troubleshooting.md troubleshooting guide for OAuth issues

Changed

• client.py: use config-driven token_dir and callback_port instead of hardcoded values
• client.py: request client_secret_post auth method during OAuth dynamic client registration
• client.py: skip health check for OAuth connections (hosted endpoint requires bearer token)