chore: release 0.2.1 with crates.io metadata

Share version, edition, license, authors, repository and readme through
[workspace.package]; add per-crate documentation, keywords and
categories. Fixes `cargo publish` warning about missing documentation,
homepage or repository.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tines-sim/Cargo.toml

@@ -1,13 +1,18 @@
 [package]
 name = "tines-sim"
-version = "0.2.0"
-edition = "2021"
-license = "Apache-2.0"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
 description = "Discrete-time simulator for tines: contact traces, convergence scenarios, and property tests."
-authors = ["K. Isom"]
+authors.workspace = true
+repository.workspace = true
+readme.workspace = true
+documentation = "https://docs.rs/tines-sim"
+keywords = ["robotics", "gossip", "simulation", "delay-tolerant"]
+categories = ["simulation", "science::robotics"]
 
 [dependencies]
-tines-core = { path = "../tines-core", version = "0.2.0" }
+tines-core = { path = "../tines-core", version = "0.2.1" }
 rand = "0.8"
 
 [dev-dependencies]