Log Message:
arti: update to 1.4.1.

# Arti 1.4.1 — 3 March 2025

Arti 1.4.1 contains
significant behind-the-scenes groundwork for [Conflux],
a feature that improves performance and reliability
by allowing data streams to tunnel over multiple circuits.

It also adds client-side support for an
[improved representation of family membership][prop321].

### Major features

- Arti now implements the client side of ID-based families
  (a.k.a. ["Happy Families"][prop321]).
  When deployed everywhere on the network,
  this feature will allow us
  to remove around 80-90% of the data from microdescriptors,
  and save some administrative complexity.
  ([#1848], [!2792])

### Breaking changes in lower-level crates

- Removed the deprecated experimental `DataStream::circuit` API. ([!2794])
- Removed the `ClientCirc::channel` API. ([!2783])
- Functions in `tor-netdir` and `tor-relay-selection` related to families
  now take a new `FamilyRules` argument,
  to represent relevant network parameters. ([!2792])

### Conflux development

- Major simplification and refactoring in the `tor-proto` crate,
  to lay the groundwork for [Conflux] in Arti.
  ([#1839], [!2772], [!2774], [!2783], [!2786], [!2796], [!2800], [!2804])
- Implemented message types that will be used for Conflux.
  ([#1852], [!2789])
- Added types for identifying hops within a Conflux tunnel.
  ([!2799], [!2803])

### Onion service development

- Refactored `ReplayLog` code so it can be used to detect replays
  in both INTRODUCE messages and proof-of-work solutions. ([!2688])

### Testing

- Added thread-management support to our testing mock runtime.
  ([#1835], [!2793])

### Documentation

- Fixes and cleanups to examples on website. ([!2775])
- Fixed a typo. ([!2795])
- Documentation for experimental features in the `tor-keymgr` README.
  ([!2806])

### Network updates

- Updated to the latest list of Tor fallback directories. ([!2787])

### Cleanups, minor features, and bugfixes

- Upgraded to the latest versions of [`hickory-proto`],
  [`derive-deftly`], and several other crates.
  ([#1847], [!2784], [!2788], [!2809])
- Fixed new clippy warnings that appeared in Rust 1.85.
  ([!2801])
- Do not emit ANSI color to our stdout log
  when that log is not being sent to a terminal. ([#1763], [!2802])
- The `DataStream` type now implements `Sync`. ([#1859], [!2808])