`os.constants.UV_UDP_REUSEADDR` missing (follow-up to #649)

[proggeramlug]

Repro

import * as os from "node:os";
console.log("UV_UDP_REUSEADDR:", os.constants.UV_UDP_REUSEADDR);
console.log("signals.SIGINT:", os.constants.signals?.SIGINT);
console.log("dlopen.RTLD_LAZY:", os.constants.dlopen?.RTLD_LAZY);
console.log("priority.PRIORITY_NORMAL:", os.constants.priority?.PRIORITY_NORMAL);

Actual (Perry)

UV_UDP_REUSEADDR: undefined
signals.SIGINT: 2
dlopen.RTLD_LAZY: 1
priority.PRIORITY_NORMAL: 0

Expected (Node)

UV_UDP_REUSEADDR: 4
signals.SIGINT: 2
dlopen.RTLD_LAZY: 1
priority.PRIORITY_NORMAL: 0

Impact

Tiny standalone gap left over from #649. The three nested-namespace tables (signals, errno, priority, dlopen) were populated correctly, but os.constants.UV_UDP_REUSEADDR (a top-level constant directly on constants, not inside a nested table) was missed.

Used by code that constructs UDP sockets with SO_REUSEADDR opt — dgram.createSocket({ type: 'udp4', reuseAddr: true }) is the high-level form, but lower-level libraries inline os.constants.UV_UDP_REUSEADDR into option bags.

This is the ONLY remaining os.constants divergence in test-files/test_parity_os.ts — the parity diff is otherwise 1 line off Node. Fix this and test_parity_os reaches full byte-for-byte parity.

Acceptance

The 5-line repro prints UV_UDP_REUSEADDR: 4 matching Node.

Related

Follow-up to #649 (closed). Surfaced via test-files/test_parity_os.ts (diff size = 2, second-smallest in the parity suite).

[proggeramlug]

Fixed in v0.5.834 (commit 1cc5882). Added "UV_UDP_REUSEADDR" => Some(4.0) arm to the os.constants match in crates/perry-runtime/src/object.rs::get_native_module_constant. Issue's 5-line repro now prints UV_UDP_REUSEADDR: 4 byte-identical to Node.