fix: preserve callback state when wrapping requests

[alexandroit]

Summary

HttpClient.request wraps caller-provided callbacks with once. The published
once@1.4.0 wrapper copies enumerable callback properties after initializing
its own state, so a callback that already owns called or value can suppress
its first invocation or expose a value before it runs.

This change:

• keeps Restify's existing require('once') imports unchanged by using an npm
  alias under the historical once dependency key;
• resolves that key to exact @stackline/once@1.0.0, an ISC compatibility
  continuation with zero runtime dependencies; and
• adds a regression through the real HttpClient.request path proving a
  decorated callback starts with clean wrapper state, runs exactly once, and
  retains the wrapper's public called state.

No Restify source import or public API changes.

Package: https://www.npmjs.com/package/@stackline/once/v/1.0.0
Source/release: https://github.com/alexandroit/stackline-once/releases/tag/stackline-v1.0.0

Verification

• clean Yarn 1.22.22 install from the public npm registry; the once key
  resolves to @stackline/once@1.0.0 with zero runtime dependencies;
• make lint;
• make codestyle;
• deterministic non-environmental suite: 230 passing on Node 22.23.0,
  24.19.0, and 26.8.1;
• focused reserved once state regression: 1 passing on each of Node 22, 24,
  and 26;
• direct consumer smoke covering initial state, first/second calls, decoration
  preservation, package identity, and the zero-dependency tree.

For comparison, the focused regression fails against the current
once@1.4.0 dependency because wrappedCallback.called is already true, and
passes with this alias.

I also ran the complete local make coverage suite. It reached 232 passing and
6 host-environment failures, all outside the changed code: fixed port 8080 was
already occupied in the socket-close test, and five tests expecting a delayed
ConnectTimeoutError received an immediate generic network error for
10.255.255.1 on this host. The deterministic runs above exclude the fixed-port
and connect-timeout cases; no other test was excluded or failed.

Disclosure

I maintain @stackline/once, so this pull request proposes a package I publish.
The package is a compatibility-focused continuation of the ISC-licensed once
line and is not affiliated with or endorsed by the original once maintainers.