[Kinflou]

Step 4 of target versions (generation#76): the docs for what steps 1–3 shipped.

• Guide, Generating code, a new "Language versions" section:
  • a declared version is a minimum, and each generator has a floor (comline targets output shown);
  • comline build proves every declaration: the floor, dependencies' declarations, and features at that version;
  • comline.toml may only raise lang_version, and a version never changes the wire;
  • past what a generator has verified, the generation::unverified-version warning, with the settings snippet that makes it an error;
  • the version headers, and TypeScript's peer dependency.
• Examples move to rust#1.85.0. The python#3.11.0 example becomes typescript#5.0, since comline build now refuses a language it has no generator for. The comline.toml examples show raising the version (1.88.0).
• Reference: comline build and comline targets in the CLI table, and lang_version in comline.toml.
• Rust: generated errors implement core::error::Error (comline-rust#70), replacing the paragraph that said it was waiting on 1.81.
• Language target versions is marked implemented. A new "As implemented" section records where the result differs from the text: Rust's floor is 1.85 with no boundaries, an unknown language fails the build, the editor checks direct dependencies only, targets keeps name#floor first, the peer dependency is optional, and what isn't done yet. implemented is added to the proposal status legend.
• Language pages re-synced from features.json (rust 1.85.0).

The design records still say rust#1.70.0; they describe what was true when written.

zensical build --strict passes, and so do the CLI and IDL drift checks.