refactor!: rebrand wraith to alknet

Rename all crates, CLI commands, constants, type names, doc comments,
and documentation from wraith to alknet. Includes wire-protocol changes:
ALPN wraith-ssh -> alknet-ssh, reserved destination prefix wraith- ->
alknet-, SSH auth username wraith -> alknet.

tasks/setup/project-init.md

@@ -1,6 +1,6 @@
 ---
 id: setup/project-init
-name: Initialize Cargo workspace with wraith, wraith-core, and wraith-napi crates
+name: Initialize Cargo workspace with alknet, alknet-core, and alknet-napi crates
 status: pending
 depends_on: []
 scope: moderate
@@ -13,30 +13,30 @@ level: implementation
 
 Set up the Rust workspace from scratch. The repo currently has only `docs/` and `.git/`. Initialize a Cargo workspace with three crate directories following the architecture spec:
 
-- **`wraith-core`** — library crate with feature flags (`tls`, `iroh`, `acme`). All core logic lives here.
-- **`wraith`** — binary crate depending on `wraith-core`. CLI entry point.
-- **`wraith-napi`** — napi-rs crate for the Node.js native addon (skeleton only at this stage).
+- **`alknet-core`** — library crate with feature flags (`tls`, `iroh`, `acme`). All core logic lives here.
+- **`alknet`** — binary crate depending on `alknet-core`. CLI entry point.
+- **`alknet-napi`** — napi-rs crate for the Node.js native addon (skeleton only at this stage).
 
 Per overview.md: `russh`, `tokio`, `clap`, `tracing`, `anyhow`/`thiserror` are core dependencies. `tokio-rustls`, `rustls`, `rustls-acme`, `iroh` are feature-gated.
 
 ## Acceptance Criteria
 
-- [ ] `Cargo.toml` workspace root with `[workspace]` members: `crates/wraith-core`, `crates/wraith`, `crates/wraith-napi`
-- [ ] `crates/wraith-core/Cargo.toml` with library crate, feature flags: `tls` (tokio-rustls + rustls), `iroh` (iroh), `acme` (rustls-acme, implies `tls`)
+- [ ] `Cargo.toml` workspace root with `[workspace]` members: `crates/alknet-core`, `crates/alknet`, `crates/alknet-napi`
+- [ ] `crates/alknet-core/Cargo.toml` with library crate, feature flags: `tls` (tokio-rustls + rustls), `iroh` (iroh), `acme` (rustls-acme, implies `tls`)
 - [ ] Core dependencies listed: `russh`, `tokio` (full), `tracing`, `anyhow`, `thiserror`, `tokio-util`
-- [ ] `crates/wraith/Cargo.toml` with binary crate, depends on `wraith-core` with default features, `clap` with `derive` feature
-- [ ] `crates/wraith-napi/Cargo.toml` with `cdylib` crate type, depends on `wraith-core`, `napi` and `napi-derive`
-- [ ] `crates/wraith-core/src/lib.rs` with module skeleton: `pub mod transport; pub mod client; pub mod server; pub mod auth; pub mod socks5; pub mod error;`
-- [ ] `crates/wraith/src/main.rs` with minimal `fn main()` skeleton
-- [ ] `crates/wraith-napi/src/lib.rs` with `#[macro_use] extern crate napi_derive;` and empty skeleton
+- [ ] `crates/alknet/Cargo.toml` with binary crate, depends on `alknet-core` with default features, `clap` with `derive` feature
+- [ ] `crates/alknet-napi/Cargo.toml` with `cdylib` crate type, depends on `alknet-core`, `napi` and `napi-derive`
+- [ ] `crates/alknet-core/src/lib.rs` with module skeleton: `pub mod transport; pub mod client; pub mod server; pub mod auth; pub mod socks5; pub mod error;`
+- [ ] `crates/alknet/src/main.rs` with minimal `fn main()` skeleton
+- [ ] `crates/alknet-napi/src/lib.rs` with `#[macro_use] extern crate napi_derive;` and empty skeleton
 - [ ] `.gitignore` covers `target/`, `node_modules/`
 - [ ] `cargo check` succeeds for all workspace members
-- [ ] Feature flags resolve correctly: `cargo check -p wraith-core --features tls`, `--features iroh`, `--features acme`
+- [ ] Feature flags resolve correctly: `cargo check -p alknet-core --features tls`, `--features iroh`, `--features acme`
 
 ## References
 
 - docs/architecture/overview.md — package structure, dependencies, feature flags
-- docs/architecture/napi-and-pubsub.md — wraith-napi crate purpose
+- docs/architecture/napi-and-pubsub.md — alknet-napi crate purpose
 
 ## Notes