fix(node): fill constants tail (constants/zlib Zstd) + util.types predicate tail

[proggeramlug]

Closes #3683
Closes #3677
Closes #3678

Implementation

#3683 — node:constants tail

Added the POSIX file-mode/open flags, libuv flags, and default-cipher metadata Node exposes but Perry resolved to undefined:

• libuv: UV_DIRENT_* (0–7), UV_FS_SYMLINK_DIR/JUNCTION, UV_FS_COPYFILE_EXCL/FICLONE/FICLONE_FORCE
• POSIX file-type masks: S_IFMT/S_IFREG/S_IFDIR/S_IFCHR/S_IFBLK/S_IFIFO/S_IFLNK/S_IFSOCK
• open() flags: O_DIRECTORY/O_NOCTTY/O_NONBLOCK/O_SYNC/O_DSYNC/O_SYMLINK
• defaultCoreCipherList (string)

Wired into both the value-read dispatch (node:constants and fs.constants) and the Object.keys enumerable-keys list. O_* / S_IF* use libc:: on Unix for host-accurate values (e.g. O_DIRECTORY differs Linux vs macOS); literal fallbacks for non-unix.

#3677 — node:zlib Zstd enumeration

Object.keys(zlib.constants) returned 0 keys; it now enumerates the full 170-key Z_*/BROTLI_*/ZSTD_* set Node exposes (63 of them ZSTD*), in Node's insertion order. Added the previously-missing Brotli decoder result/error codes and the ZSTD_error_* codes to the value-read dispatch so every enumerated key reads its backing value (no enumerate-but-undefined lie).

#3678 — node:util/types predicate tail

Added the predicates Perry can correctly back: isDataView, isFloat16Array, isWeakMap, isWeakSet, isExternal. Each is wired through the runtime dispatch (util/util.types/util/types), the codegen call-lowering maps, the native table, runtime decls, callable-export value resolution (so typeof === "function"), and the API manifest.

Dropped (would lie about unimplemented features): isBigIntObject / isSymbolObject (Perry boxes only Number/String/Boolean), isArgumentsObject (no distinct arguments object — Perry uses arrays), isModuleNamespaceObject, isKeyObject, isCryptoKey (no backing KeyObject/CryptoKey value type). A false-always stub would return the wrong answer for Node's positive cases.

Also added the missing manifest rows for process.sourceMapsEnabled / setSourceMapsEnabled (native-table drift introduced by #3684) so the manifest-consistency check stays green.

Validation

• Gap test test-files/test_gap_constants_tail_3683plus.ts is byte-identical to node --experimental-strip-types under the DEFAULT auto-optimize compile.
• cargo test --release green for perry-runtime (930), perry-codegen (incl. manifest_consistency drift check), perry-api-manifest (18), perry-hir.
• cargo fmt --all -- --check clean, ./scripts/check_file_size.sh exit 0.
• API docs regenerated (./scripts/regen_api_docs.sh).
• No new HIR variants.