Add build version reporting

docs/cli.md

@@ -10,6 +10,7 @@ defined in [Operations](operations.md).
 
 ~~~
 notarius help
+notarius --version
 notarius run <pipeline-id> --input path/to/source.json [--json] [flags]
 notarius config validate [--config path/to/config.yml] [--pipeline pipeline-id] [--only lane-a,lane-b]
 notarius pipelines list [--config path/to/config.yml] [--json]
@@ -18,6 +19,17 @@ notarius pipelines list [--config path/to/config.yml] [--json]
 Running Notarius without arguments, or with **help**, **--help**, or **-h**,
 writes the command summary to standard output and exits with status 0.
 
+`notarius --version` is valid only as the sole root argument. It writes exactly
+`notarius <version>` followed by a newline to standard output and exits with
+status 0. A tagged `go install` build can report its main-module stable tag,
+and controlled builds can inject a stable tag at link time through
+`gitea.maximumdirect.net/eric/notarius/internal/buildinfo.Override`; an ordinary
+unversioned checkout reports `development`. Invalid injected version content is
+a runtime error with exit status 1, while extra `--version` arguments are a
+syntax error with exit status 2. This diagnostic does not replace the
+[run-result](integrations/run-result.md) or artifact contracts for downstream
+compatibility decisions.
+
 ## run
 
 ~~~

docs/internal/cli.md

@@ -24,10 +24,14 @@ preparation, and runner mechanics after their inputs are supplied.
 
 ## Dispatch And Configuration Handoff
 
-The root dispatcher handles help, configuration validation, pipeline listing,
-and a pipeline run. It normalizes injectable options before dispatch so that a
-missing production dependency fails as a command error rather than reaching
-execution.
+The root dispatcher handles help, version reporting, configuration validation,
+pipeline listing, and a pipeline run. Version reporting resolves build
+information through `internal/buildinfo` before production composition, so the
+diagnostic remains available without configuration or runtime collaborators.
+The public syntax, streams, exit classes, and version semantics are defined by
+the [CLI reference](../cli.md). Other root commands normalize injectable
+options before dispatch so that a missing production dependency fails as a
+command error rather than reaching execution.
 
 Commands that need configuration use one shared loader. The CLI discovers the
 file, parses it through **internal/core/config**, starts from defaults, applies

docs/roadmap/implementation.md

@@ -41,7 +41,7 @@ operation.
 - Tag CI validates only. Pre-publication local guards remain mandatory because
   tag CI cannot prevent an already-pushed tag.
 
-## Stage 1: Add Build Version Resolution And `--version`
+## Stage 1: Add Build Version Resolution And `--version` ✅
 
 ### Goal