REA ships one Windows x64 Node-API 8 addon. Users do not compile it or install another runtime. Ghidra and a full JDK remain bring-your-own prerequisites. The addon uses Windows 10+ APIs and admits fixed local NTFS volumes only.

The package owns the artifact path. The loader checks the package version, ABI, Node-API compatibility, PE architecture, and SHA-256 before loading it. There is no environment override for loading an arbitrary native module.

The artifact lane requires Linux, MinGW-w64 x86_64-w64-mingw32-g++, x86_64-w64-mingw32-dlltool, and tar. It never installs these commands. Node-API headers are reused from the build cache or downloaded from the pinned official Node release with its published SHA-256 checked.

npm run build:windows-native
npm run verify:windows-native:artifact
npm pack

build/ is ignored by Git. The npm file inventory includes only the addon and its manifest. Release CI builds both, and prepublishOnly rejects a missing, stale, mismatched, or wrong-architecture artifact. A development tarball built without this lane reports Windows native controls as unavailable.

• Opaque Node objects carry a native type tag, resource kind, and closed state. A pathname, serialized object, or forged handle cannot grant authority.
• Input admission opens every component with OPEN_REPARSE_POINT, verifies the actual NTFS object, and retains handles that deny replacement and source writing. An admitted child keeps each ancestor nonempty; ancestor handles permit unrelated writes while NTFS rejects in-place reparse conversion. Volume serial, 128-bit file ID, final handle path, requested path, size, and digest observations are preserved separately.
• New runtime roots and private child objects are created relative to admitted parent handles with NtCreateFile. A protected DACL and current-user owner are installed at creation. Readback permits exactly the current user and SYSTEM. Child files inherit this boundary; private files are also checked by handle.
• Snapshots stream through a 64 KiB buffer on a Node async worker. Cancellation is checked between reads, cleanup waits for settlement, and the digest commits to the bytes written. Descriptor and snapshot handles remain held until runtime cleanup. Snapshot ownership is single-flight per runtime: an overlapping request fails with ERROR_BUSY before acquiring cancellation ownership. The TypeScript owner records only the accepted promise and abort listener; aborting a rejected copy must not cancel the active copy.
• PROC_THREAD_ATTRIBUTE_JOB_LIST assigns a suspended child atomically to an unnamed, non-inherited Job Object. Membership and kill-on-close policy are checked before resume. Breakaway is disabled, and cleanup waits for all job members and captured output, including detached descendants.
• Only the suspended child's default file owner is normalized. Caller token privileges and ownership remain unchanged. Caller CPU affinity and process priority are preserved in the child. Environment names are sorted and deduplicated using Windows ordinal comparison, preserving their native Unicode semantics and caller-selected values.
• Cleanup walks locked directory objects, removes files by handle, and unlinks reparse entries without traversing their targets. Normal close, cancellation, startup failure, and timeout release provider resources. Abrupt owner death kills the owned job; it can leave private runtime files for later operator cleanup and does not claim transactional deletion after a crash.

Windows failures retain their constraint, requested coordinate, Win32 code, and system message. Unsupported filesystems and reparse paths are distinct from OS access denial and missing packaged controls.

The bearer-token descriptor remains under its immutable private lease until runtime_close on Windows; POSIX removes the descriptor after the bridge reads it. Job ownership guarantees process termination on owner death, not deletion of private files after a crash. SUBST drive aliases and changing DOS-device namespaces are outside the verified P0 scope and are not detected as a separate alias policy. Mounted-folder paths that report a reparse tag are rejected by component admission; broader namespace variants remain unverified. Preserve requested and final handle coordinates rather than treating them as one identity.

npm run verify:windows-native
npm run verify:ghidra:windows

The native lane checks DACL readback independently, source write/replacement rejection, unrelated sibling renames, reparse rejection, immutable snapshots, asynchronous cancellation, cleanup containment, descendant termination, unrelated-process preservation, normal exit, owner close, and forced owner exit. An optional independently built tests/fixtures/windows/processBoundary.cc executable adds breakaway and caller/child token observations and an in-place ancestor reparse attempt:

node scripts/verify-windows-native.mjs . C:\fixtures\process-boundary.exe

nonAdminRunner.cc is a test-only launcher for an elevated development shell. It duplicates an existing non-elevated Explorer token belonging to the same user, creates private temporary window-station objects, and launches the test inside a kill-on-close fixture job. It does not create accounts, modify host policy, or change the caller's token. A real-provider claim must additionally verify the packaged CLI and MCP on that ordinary-user token.