feat(cmd): add version, plain json, struct inference and schema modes

Assisted-by: GLM 5.3 Flash

CHANGELOG.md

@@ -88,6 +88,22 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   is an error wrapped with the key path.
 - `MarshalAppend(buf, v)` appends the TOML encoding of v to buf and returns
   the extended buffer, the shape `json.MarshalAppend` has.
+- `interpres-decode -version` prints the binary's version, the module version
+  the toolchain recorded, so a release-built binary names its own tag.
+- `interpres-decode -json` prints plain indented JSON instead of the tagged
+  form, the shape for people and diffs, with the date-time wrappers in their
+  TOML form.
+- `interpres-decode -validate` walks a named directory for `.toml` files and
+  closes the sweep with a summary naming how many documents were checked and
+  how many were invalid; single files stay quiet on success as before.
+- `interpres-decode -struct` infers a Go struct definition from a document:
+  one field per key in written order, nested tables as nested struct types,
+  an array of tables as a slice. The printed type compiles and decodes the
+  document it came from.
+- `interpres-decode -schema TYPE file.go` writes a TOML template for the
+  named struct type of a Go source, the `comment=` tag option printed as a
+  comment and the `default=` option as the value. It is the inverse of
+  `-struct`.
 - `ParseFile(path)` reads the file and parses it into a `Document`, with the
   file name at the front of every error it returns, read failure and parse
   failure alike. `Valid(data)` reports whether a document parses, nil on