Some fixes for publication hygiene

Cargo.toml

@@ -7,24 +7,28 @@ description = "A highly performant astrodynamics engine"
 readme = "readme.md"
 repository = "https://git.rcjohnstone.com/connor/astrokit"
 license = "MIT"
+# The oldest toolchain this is tested against, not the oldest it might compile on.
+rust-version = "1.89"
 keywords = ["astrodynamics", "orbit", "propagation", "spaceflight"]
 categories = ["science", "aerospace"]
+exclude = [
+    "tests/*",
+    "scripts/*",
+    ".githooks/*",
+]
+
+[package.metadata.docs.rs]
+all-features = true
 
 [features]
 default = ["autodiff", "msis"]
 autodiff = ["dep:num-dual"]
-# NRLMSISE-00 as a density model, from its own crate. Brings that crate's `fast` path,
-# which trades the reference's exact bits for roughly half the time: the largest value it
-# moves over the reference grid moves by 3.9e-14 of itself, against a model whose own
-# agreement with the atmosphere is tens of percent.
+# NRLMSISE-00 as a density model, from its own crate
 msis = ["dep:nrlmsise00"]
 
 [dependencies]
-# We handle the kernel fetching, so we don't need anise's default features
 anise = { version = "0.10.6", default-features = false }
 hifitime = "4.3"
-# A facade only. Nothing is logged unless the program installs a logger, and the one
-# thing this crate reports that way is a density model falling back to a fixed profile.
 log = "0.4"
 nalgebra = { version = "0.35", features = ["serde-serialize"] }
 num-dual = { version = "0.15", optional = true }

src/lib.rs

@@ -5,8 +5,8 @@
 //! - Everything is SI: meters, seconds, kilograms, radians.
 //! - Times are always typed using hifitime
 
-// Needed to build docs
-#![cfg_attr(feature = "autodiff", doc = include_str!("../readme.md"))]
+// The readme is the crate's front page, so its examples cannot drift from the API.
+#![doc = include_str!("../readme.md")]
 #![warn(missing_docs)]
 
 /// The linear algebra crate this is built on, re-exported.