Add prompt inspection command

docs/cli.md

@@ -23,6 +23,7 @@ go run ./cmd/scriptorium render \
   generated artifact.
 - `scriptorium render`: prepare a prompt and write prepared-run output.
 - `scriptorium serve`: start the HTTP server.
+- `scriptorium inspect prompt`: inspect one prompt definition without model execution.
 
 All commands accept `--config <path>` and reject positional arguments. An
 effective `prompt_dir` is required for every command. Supply it through the
@@ -137,6 +138,19 @@ Optional flags:
 `serve` accepts no runtime model override flags. HTTP request fields, response
 schemas, and error codes are defined in the [HTTP API reference](api.md).
 
+## `scriptorium inspect prompt`
+
+```text
+scriptorium inspect prompt --prompt ID [--prompt-version VERSION]
+    [--config PATH] [--prompt-dir DIR] [--format text|json] [--out PATH]
+```
+
+`--prompt` is required. Inspection uses normal configuration discovery and a
+`--prompt-dir` override, defaults to text regardless of `defaults.render_format`,
+and writes to stdout unless `--out` is supplied. It loads and normalizes the
+selected definition but does not resolve a profile, load a schema, render a
+template, reserve backend capacity, or call a model.
+
 ## Input And Variable Syntax
 
 `--input name=path` maps an input name to a local file; `--var name=value`