changelog: run maint/changelog-syntax-fiddle

  now take a `impl Into<ExplicitOrAuto<usize>>` instead of a `usize`.

  This should generally be backwards compatible, but may cause type inference errors.

  (These types are effectively part of the public API of `arti-client`.)

  !3110

  ([!3110])

### Security fixes

- Replace the Hidden Service (.onion service) Proof of Work control loop.

  Improves denial of service resistance.

  [Proposal 362]

  !3093

  ([!3093])

  No TROVE.

- Limit hidden service descriptor size inflation.

  [Proposal 360]

  torspec!411

  #2046

  !3070

  ([#2046], [!3070])

  No TROVE.

### Major bugfixes

- Fix spurious 0-length buffer read in `DataReader`.

  This bug caused some client programs to experience truncated streams, losing data.

  !3080

  #2053

  ([!3080], [#2053])

### Major features

- New experimental `arti hss ctor-migrate` command line invocation

  for migrating a hidden serivce (`.onion` service) identity key

  from C Tor to an Arti keystore.

  !3102

  ([!3102])

- Enable the memquota (memory use control) system by default.

  (Part of congestion control work.)

  !3110

  #2030

  ([!3110], [#2030])

### Breaking changes in lower-level crates

- `tor-cell`: `UnparsedRelayMsg::data_len()` now returns a `Result`.

  !3094

  ([!3094])

- `tor-hscrypto`: `HsID` no longer implements `LowerHex` or `Display`.

  !3107

  ([!3107])

- `tor-keymgr`: `UnrecognizedEntryError::new` no longer exposed;

  `UnrecognizedEntryId` renamed to `UnrecognizedEntry`;

  `KeyMgr::list()` and `Keystore::list()` return types changed.

  !3059

  ([!3059])

### Development progress

#### Conflux

- Add tests for client-side SWITCH handling

  !3091

  ([!3091])

- Preparatory work for replacing the `tor-proto` circuit reactor:

  Add a `ConfluxSet::remove_unchecked` method.

  !3105

  #1803

  ([!3105], [#1803])

#### Congestion control

- Code for handling XON/XOFF messages in `tor-proto` and `tor-cell`.

  !3054

  !3094

  !3099

  ([!3054], [!3094], [!3099])

- `tor-cell`: Exposed flow-control related types.

  (Previously these were behind the experimental 'flowctl-cc' feature,

  which is removed in this release.)

- Implementation of CGO negotiation and use, in `tor-proto`.

  Not yet usable.

  [Proposal 359]

  !3069

  #1947

  #1945

  ([!3069], [#1947], [#1945])

### Testing

- Update shadow, mostly to get reproducibility fixes.

  !3092

  ([!3092])

  [shadow#3610](https://github.com/shadow/shadow/issues/3610)

- Pin `cargo-licence` to 0.7.0, and update our allows to match its output.

  !3108

  #2083

  !3111

  ([!3108], [#2083], [!3111])

### Cleanups, minor features, and bugfixes

#### User-facing

- Provide experimental `arti keys-raw remove-by-id` command line function.

  !3059

  !3095

  ([!3059], [!3095])

#### Developer-facing

- Re-export `ConfigurationSources` from the `arti_client` crate.

  !3044

  ([!3044])

- `safelog`: New `DisplayRedacted`/`DebugRedacted` APIs

  to help avoid accidentally redacting, corrupting, or exposing,

  hidden service identities (`.onion` names).

  !3107

  !3071

  #2012

  #2066

  ([!3107], [!3071], [#2012], [#2066])

- Fix documentation for macros in `tor_hscrypto::pk`.

  #2050

  !3104

  ([#2050], [!3104])

- Many typo fixes.

  !3090

  !3089

  ([!3090], [!3089])

#### Internal and administrative

- Introduce a new internal error type `KeystoreNotConfigured`,

  for improved clarity and less confusion in keystore error handling.

  !3103

  ([!3103])

- Update an internal TODO about `NonZero`.

  !3067

  ([!3067])

  [rust-lang/rust#142966](https://github.com/rust-lang/rust/issues/142966)

- Remove some unnecessary parens in the code.

  !3096

  ([!3096])

- Update dependencies.

  !3073

  !3117

  ([!3073], [!3117])

### Acknowledgments