Windows CI job is red: CRLF parsing and drive-letter paths in contract tests #29

The windows-latest · codegen, analyse, format, test job fails on develop (run 38029954030) and on PR #28 (run 38034738787). Four defects, all in tests, all Windows-only:

1. packages/alteri_one_core/test/engine/control_primitives_contract_test.dart — _publicMembers splits control.dart on '\n' and searches for a line exactly equal to '}'. The repo has no .gitattributes, so a Windows checkout is CRLF; the search never matches, the slice runs to EOF, and the member list silently becomes the union of every class in the file. Fixed on feature/engine-control-primitives (PR feat(core): task 0.14 — the engine control primitives #28) via LineSplitter.
2. packages/alteri_one_platform/test/platform/ports_contract_test.dart — Directory(_packageRoot().uri.path + '/lib'): on Windows uri.path is /d:/a/... (leading slash before the drive), so the walk threw FileSystemException errno 123.
3. Same file — paths.resolve('state/default').toFilePath() asserted endsWith('state/default'); toFilePath() separates with \\ on Windows.
4. Same file, _isInsideIoDirectory — replaceAll(r'\\', '/') matches TWO backslashes, so on Windows the normalisation was a no-op and every file under lib/src/io/ was reported as outside it (surfaced only once defect 2 let the walk run). Fixed to '\\' on bugfix/windows-platform-tests.

2, 3 and 4 are fixed on bugfix/windows-platform-tests (#30).

Acceptance: the Windows job is green end to end. Note melos exec --fail-fast cancels the remaining packages after the first failure, so alteri_one_protocol and the root package tests have not actually run on Windows in these runs — further Windows-only defects may surface once the first ones are fixed.