Adopt the Promptkit v0.9 compatibility baseline

docs/config.md

@@ -3,7 +3,7 @@
 This is the canonical reference for Scriptorium application settings. Prompt,
 profile, schema, execution-setting, built-in profile, and framework credential
 semantics are defined by the
-[Promptkit v0.1.0 format reference](https://gitea.maximumdirect.net/eric/promptkit/src/tag/v0.1.0/docs/formats.md).
+[Promptkit v0.9.0 format reference](https://gitea.maximumdirect.net/eric/promptkit/src/tag/v0.9.0/docs/formats.md).
 For command syntax, see the [CLI reference](cli.md); for HTTP request shapes and
 outcomes, see the [HTTP API reference](api.md).
 
@@ -58,7 +58,7 @@ parse those framework file formats.
   contracts.
 
 See the
-[tagged Promptkit format reference](https://gitea.maximumdirect.net/eric/promptkit/src/tag/v0.1.0/docs/formats.md)
+[tagged Promptkit format reference](https://gitea.maximumdirect.net/eric/promptkit/src/tag/v0.9.0/docs/formats.md)
 for all of those definitions. The files under
 [`examples/prompts`](../examples/prompts/),
 [`examples/profiles`](../examples/profiles/), and
@@ -73,8 +73,20 @@ their names in configuration or framework source files. Do not place raw keys
 in configuration, prompts, profiles, CLI arguments, examples, or HTTP
 payloads.
 
+An optional `api_key_env` whose environment value is absent or empty can result
+in an unauthenticated provider request. A profile that declares credentials
+required still fails as an invalid request when no credential source is
+selected, and fails with `ErrAPIKeyEnvMissing` when its selected environment
+source is absent or empty. Scriptorium never reads or emits the environment
+value itself.
+
+Unset optional provider controls are omitted from compatible provider requests.
+A positive Promptkit `repair_attempts` budget can add provider calls, latency,
+token use, and cost; see the tagged format reference for its permitted values
+and validation-mode requirements.
+
 Promptkit's
-[OpenAI-compatible integration contract](https://gitea.maximumdirect.net/eric/promptkit/src/tag/v0.1.0/docs/integrations/openai-compatible-chat.md)
+[OpenAI-compatible integration contract](https://gitea.maximumdirect.net/eric/promptkit/src/tag/v0.9.0/docs/integrations/openai-compatible-chat.md)
 defines outbound authentication, provider request mapping, transport limits,
 and timeout layering.
 
@@ -83,4 +95,4 @@ and timeout layering.
 - [CLI reference](cli.md)
 - [HTTP API reference](api.md)
 - [Operations guide](operations.md)
-- [Promptkit framework formats](https://gitea.maximumdirect.net/eric/promptkit/src/tag/v0.1.0/docs/formats.md)
+- [Promptkit framework formats](https://gitea.maximumdirect.net/eric/promptkit/src/tag/v0.9.0/docs/formats.md)