Add path posix and win32 submodule manifest entries

[andrewtdiz]

Closes #2712.

Summary:

• Add path/posix and path/win32 to the API manifest, native module list, runtime-only module list, and generated API docs.
• Alias direct Node path submodules to the existing path.posix / path.win32 runtime namespaces, including callable exports and sep / delimiter / recursive posix / win32 properties.
• Add a parity fixture for default and namespace imports from node:path/posix and node:path/win32.

Validation:

• PATH="/root/.npm/_npx/8758e404b5eed2f3/node_modules/.bin:$PATH" node test-parity/node-suite/path/submodules/direct-imports.ts
• env RUSTC_WRAPPER= PATH="/root/.npm/_npx/8758e404b5eed2f3/node_modules/.bin:$PATH" ./run_parity_tests.sh --suite node-suite --module path --filter direct-imports (report test-parity/reports/parity_report_20260529_225711.json)
• env RUSTC_WRAPPER= PATH="/root/.npm/_npx/8758e404b5eed2f3/node_modules/.bin:$PATH" ./run_parity_tests.sh --suite node-suite --module path (83/83, report test-parity/reports/parity_report_20260529_225817.json)
• env RUSTC_WRAPPER= cargo test -p perry-api-manifest
• env RUSTC_WRAPPER= cargo test -p perry-codegen --test manifest_consistency
• env RUSTC_WRAPPER= cargo check -p perry-api-manifest -p perry-hir -p perry-codegen -p perry-runtime
• env RUSTC_WRAPPER= ./scripts/regen_api_docs.sh
• cargo fmt --all -- --check
• git diff --check
• jq empty test-parity/known_failures.json test-parity/threshold.json
• ./scripts/check_file_size.sh