Expand test suite from 3 to 11 integration tests, adding comprehensive coverage
for Codex dual-file atomicity and bidirectional MCP synchronization:
New Codex sync tests:
- sync_codex_provider_writes_auth_and_config: validates atomic write of auth.json
and config.toml, plus SSOT backfill of latest toml content
- sync_enabled_to_codex_writes_enabled_servers: MCP projection to config.toml
- sync_enabled_to_codex_removes_servers_when_none_enabled: cleanup when all disabled
- sync_enabled_to_codex_returns_error_on_invalid_toml: error handling for malformed TOML
New Codex MCP import tests:
- import_from_codex_adds_servers_from_mcp_servers_table: imports new servers from live config
- import_from_codex_merges_into_existing_entries: smart merge preserving SSOT server configs
New Claude MCP tests:
- sync_claude_enabled_mcp_projects_to_user_config: enabled/disabled filtering for .claude.json
- import_from_claude_merges_into_config: intelligent merge preserving existing configurations
Expand lib.rs API exports:
- Codex paths: get_codex_auth_path, get_codex_config_path
- Claude MCP: get_claude_mcp_path
- MCP sync: sync_enabled_to_claude, sync_enabled_to_codex
- MCP import: import_from_claude, import_from_codex
- Error type: AppError (for test assertions)
Test infrastructure improvements:
- Enhanced reset_test_fs() to clean .claude.json
- All tests use isolated HOME directory with sequential execution via mutex
Test results: 11/11 passed
Files changed: 3 (+394/-6 lines)
Next steps: Command layer integration tests and error recovery scenarios
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