Remove validateClaudeAuth() function and all filesystem probing for
.claude directory and .credentials.json files from test utilities.
Changes:
- Deleted validateClaudeAuth() preflight check from claude-auth.ts
- Removed validateClaudeAuth() calls from claude-agent-commands.e2e.test.ts and agent-mcp.e2e.test.ts
- Updated seedClaudeAuth() to only use environment variables (no filesystem probing)
- Tests now rely on default Claude authentication without explicit validation
Tests run with default local Claude settings; no config directory
overrides or credential file inspection.
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
