BREAKING CHANGE: Runtime auto-migration from v1 to v2 config format has been removed.
Changes:
- Remove automatic v1→v2 migration logic from MultiAppConfig::load()
- Improve v1 detection using structural analysis (checks for 'apps' key absence)
- Return clear error with migration instructions when v1 config is detected
- Add comprehensive tests for config loading edge cases
- Fix false positive detection when v1 config contains 'version' or 'mcp' fields
Migration path for users:
1. Install v3.2.x to perform one-time auto-migration, OR
2. Manually edit ~/.cc-switch/config.json to v2 format
Rationale:
- Separates concerns: load() should be read-only, not perform side effects
- Fail-fast principle: unsupported formats should error immediately
- Simplifies code maintenance by removing migration logic from hot path
Tests added:
- load_v1_config_returns_error_and_does_not_write
- load_v1_with_extra_version_still_treated_as_v1
- load_invalid_json_returns_parse_error_and_does_not_write
- load_valid_v2_config_succeeds
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