fix(v7): resolve packaging, tsc path portability, and golden newline issues

[ProfRandom92]

Problem

TypeScript compiler (tsc) path resolution logic was duplicated across five different test files, violating PEP 8 by placing imports inside function blocks.

Root cause

Lack of shared TypeScript compiler resolution helper utility.

Final changes

• Centralized path resolution in resolve_tsc_executable() inside tests/utils/__init__.py.
• Replaced duplicate code blocks and imported the helper at the top level of the 5 test files.

Security impact

None. Improves codebase maintainability.

Compatibility impact

Supports resolving tsc.cmd on Windows and tsc on POSIX hosts, preferring local node_modules then falling back to system PATH. Normalizes LF newlines for golden content checks (not byte identity).

Tests

All 388 unit tests pass locally.

CI

• CI checks at head 0d13a604007f47c3dca29b389584662ee412820a: PASS (Analyze, CodeQL, agent-checks, and validation runs completed successfully).

Review findings addressed

• Resolved duplicate tsc path resolution logic across all 5 TypeScript integration test files.

Independent verification

Checked and confirmed clean by the Antigravity Verification Agent.

CodeRabbit status

CODERABBIT_NOT_RUN_RUNTIME_SIGILL_WSL_CPU_INCOMPATIBILITY

CodeRabbit CLI was installed successfully inside WSL 2 Ubuntu, but execution terminated with SIGILL because of CPU instruction-set compatibility in the current WSL environment. No CodeRabbit review result was produced.

Known limitations

None.

Rollback

Revert this pull request.

Evidence

• tests/utils/__init__.py

[gemini-code-assist]

Code Review

This pull request introduces a canonical content hashing mechanism to handle line ending differences consistently across platforms and adds support for locating the TypeScript compiler (tsc) on Windows environments. While these improvements are valuable, the logic for resolving the tsc executable path and its associated imports is duplicated across five different test files, which also violates PEP 8 by placing imports in the middle of the files. It is highly recommended to centralize this path resolution logic into a shared utility module and import it at the top of each test file.

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[ProfRandom92]

Resolved in commit 0d13a60.

• Cause: The local TypeScript compiler path resolution logic was duplicated across five test files.
• Fix: Centralized resolve_tsc_executable() in tests/utils/init.py and imported it at the top of the test files.
• Tests: Run all 388 unit tests successfully.
• CI Status: Running/Pending.