host: review fixes for cargo.build, the test runner, the console, and main; tests for every PROTOCOL.md rule

cargo.build and the runner (review T22R): builds use the network again;
core.unlock and core.notify in order under the runner; quiet test
output; manifest preparation keeps [workspace], target tables, renamed
and optional entries; cargo.rpc.discover; -32004 with data.output;
retention of 10 builds; light, empty test worlds with an in-memory
journal; only CARGO_/RUST_/SAUSAGE_ variables; stdin is null; the runner
through --config. A compile cache that cannot be created is not fatal.
Activation replaces plugin.wasm without a gap.

Console and main: init ships the workspace Cargo.lock and creates the
world atomically; each console command runs in its own task, so ps,
stop, and kill work during a slow call; SAUSAGE_HEADLESS; the terminal
mode is restored; signals during boot; chat text is not taken as a
command.

Tests: 20 more tests for PROTOCOL.md sections 2 to 10; the cargo tests
choose the libtest binary from cargo's JSON output and time out.

cli/tests/crates/cargo-valid/Cargo.toml

@@ -1,9 +1,15 @@
 [package]
 name = "cargo-valid"
 version = "0.1.0"
-edition = "2024"
+edition.workspace = true
 
-[dependencies]
-sausage-plugin = "0.1"
+[target.'cfg(target_arch = "wasm32")'.dependencies]
+sausage_plugin = { package = "sausage-plugin", version = "0.1", optional = true }
+
+[features]
+default = ["dep:sausage_plugin"]
 
 [workspace]
+
+[workspace.package]
+edition = "2024"