fix(path): expose _makeLong alias

[andrewtdiz]

Closes #2683.

Summary

• Add node:path _makeLong to the API manifest and generated docs.
• Route _makeLong through the same lowering, runtime binding, and dispatch path as toNamespacedPath for path, path.posix, and path.win32.
• Add a parity fixture covering enumerable keys, named/default alias equality, and POSIX/Windows results.

Repro

On origin/main (94bbda1a), the new fixture exposed the missing alias as runtime-visible undefined values:

keys top: false
keys posix: false
keys win32: false
typeof top: undefined
named equality: true
default equality: true
posix equality: true
win32 equality: true
named result: undefined
default result: undefined
posix result: undefined
win32 result: undefined

Node 24 oracle output:

keys top: true
keys posix: true
keys win32: true
typeof top: function
named equality: true
default equality: true
posix equality: true
win32 equality: true
named result: /tmp/a
default result: /tmp/a
posix result: /tmp/a
win32 result: \\?\C:\tmp\a

Fixed Perry output now matches the Node oracle.

Verification

• PATH=/home/github-runner/actions-runner/externals/node24/bin:$PATH node --experimental-strip-types test-parity/node-suite/path/toNamespacedPath/make-long-alias.ts
• RUSTC_WRAPPER= target/release/perry test-parity/node-suite/path/toNamespacedPath/make-long-alias.ts -o /tmp/perry_path_makelong_2683 && /tmp/perry_path_makelong_2683
• PATH=/home/github-runner/actions-runner/externals/node24/bin:$PATH RUSTC_WRAPPER= ./run_parity_tests.sh --suite node-suite --module path --filter make-long-alias
• PATH=/home/github-runner/actions-runner/externals/node24/bin:$PATH RUSTC_WRAPPER= ./run_parity_tests.sh --suite node-suite --module path --filter toNamespacedPath
• cargo fmt --all -- --check
• git diff --check origin/main...HEAD
• ./scripts/check_file_size.sh
• jq empty test-parity/known_failures.json test-parity/threshold.json
• RUSTC_WRAPPER= cargo check -p perry-api-manifest -p perry-hir -p perry-runtime
• RUSTC_WRAPPER= cargo test -p perry-api-manifest
• RUSTC_WRAPPER= cargo test -p perry-codegen --test manifest_consistency