Link to v0.21.0 release notes

README.md

@@ -45,6 +45,10 @@ boundary and constraints that framework work must preserve.
 
 ## Release Guidance
 
+The [v0.21.0 release notes](docs/releases/v0.21.0.md) cover ConfigKit v1.2.0
+and main-relative companion imports through the existing configuration-source
+API.
+
 The [v0.20.0 release notes](docs/releases/v0.20.0.md) cover resolved resource
 inspection, generic JSON/YAML reports, typed prompt sources, and backend
 inheritance. Upgrading consumers should review the changed inspection result

configuration_sources_test.go

@@ -63,6 +63,47 @@ func TestCollectionInputLoadsNativeImportsAndLaterOverride(t *testing.T) {
 	}
 }
 
+func TestCollectionInputUsesMainRelativeContext(t *testing.T) {
+	filesystem := configkit.NewFilesystem("application", fstest.MapFS{
+		"site/main.yaml": {Data: []byte("version: '2'\n")},
+		"site/prompts/greeting.yaml": {Data: []byte(`id: greeting
+messages:
+  - role: user
+    content_file: greeting.txt
+output: {format: text, validation_mode: none}
+`)},
+		"site/prompts/greeting.txt": {Data: []byte("Hello from the imported prompt's directory.")},
+	})
+	companion, err := promptkit.CollectionInput("support", configkit.Bytes("companion prompts", []byte(`
+config:
+  imports:
+    - dir: prompts
+      pattern: ["*.yaml", "*.yml"]
+      destination: [prompts]
+      placement: sequence-item
+      required: true
+`)))
+	if err != nil {
+		t.Fatal(err)
+	}
+	companion.MainRelative = configkit.MainRelative()
+	main := configkit.Input{Source: filesystem.File("site/main.yaml")}
+	engine, err := promptkit.NewEngine(promptkit.Config{Sources: promptkit.ConfigurationSources{
+		Main:      &main,
+		Underlays: []configkit.Underlay{{Inputs: []configkit.Input{companion}}},
+	}}, promptkit.WithBundledOpenRouter(false))
+	if err != nil {
+		t.Fatalf("construct engine with main-relative imports: %v", err)
+	}
+	inspection, err := engine.InspectPrompt(t.Context(), "support/greeting")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(inspection.Messages) != 1 || inspection.Messages[0].Content != "Hello from the imported prompt's directory." {
+		t.Fatalf("unexpected imported messages: %+v", inspection.Messages)
+	}
+}
+
 func TestCollectionInputLoadsEmbeddedImportsAndLaterOverride(t *testing.T) {
 	files := fstest.MapFS{
 		"collection.yaml": {Data: []byte("config:\n  imports:\n    - path: defaults.yaml\n      required: true\n")},

docs/consumers/pkg-promptkit.md

@@ -18,7 +18,7 @@ import "go.maximumdirect.net/promptkit"
 For migration from the former module path, see
 [Update Go Imports](configuration-migration.md#update-go-imports).
 
-Configuration APIs use `go.maximumdirect.net/configkit` v1.1.0. Its types are
+Configuration APIs use `go.maximumdirect.net/configkit` v1.2.0. Its types are
 not interchangeable with the old ConfigKit module path.
 
 The maintained [offline preparation example](../../examples/go-library/prepare/main.go)
@@ -102,6 +102,39 @@ new engine to observe configuration edits. See the [constructor GoDoc](../../eng
 for the exact public contract and the [framework format reference](../formats.md)
 for definition fields.
 
+### Load Companion Prompts Relative To The Main Configuration
+
+A non-file underlay can use the selected main configuration's directory for
+caller-declared imports. For example, this loads standalone prompt definitions
+from the adjacent `prompts/` directory into the `support` collection:
+
+```go
+main := configkit.Input{Source: configkit.File(configPath)}
+companion, err := promptkit.CollectionInput("support", configkit.Bytes("companion prompts", []byte(`
+config:
+  imports:
+    - dir: prompts
+      pattern: ["*.yaml", "*.yml"]
+      destination: [prompts]
+      placement: sequence-item
+      required: true
+`)))
+if err != nil { return err }
+companion.MainRelative = configkit.MainRelative()
+engine, err := promptkit.NewEngine(promptkit.Config{Sources: promptkit.ConfigurationSources{
+	Main: &main,
+	Underlays: []configkit.Underlay{{Inputs: []configkit.Input{companion}}},
+}})
+```
+
+`CollectionInput` enables imports; for a raw `configkit.Input`, enable them with
+`Imports: true`. The binding itself does not enable imports, and an explicit
+`Input.Filesystem` takes precedence. Imported prompt `content_file` references
+keep their source-local context. See ConfigKit's
+[layered-loading contract](https://forge.maximumdirect.net/base-layer/configkit/src/tag/v1.2.0/docs/config.md#layered-loading)
+for eligible inputs, fallback contexts, and behavior when the main has no usable
+filesystem context.
+
 ### Use Scoped Engine Views
 
 Create a view when an application wants short request IDs to resolve within a
@@ -181,7 +214,9 @@ input := configkit.Input{Source: document}
 null is not needed. Prompt and backend helpers, like profiles, support sibling
 inheritance via `Extends`; partial records can be completed by other layers.
 For relative prompt `content_file` references, supply the ordinary ConfigKit
-`Input.Filesystem` context for that source. The helpers do not read files or
+`Input.Filesystem` context for that source, or use a
+[main-relative underlay](#load-companion-prompts-relative-to-the-main-configuration).
+The helpers do not read files or
 validate final definitions. Profile and backend provider maps use ConfigKit Mapping input forms: built-in
 scalars, `[]any`, and `map[string]any` recursively. Convert `json.Number` or
 typed containers explicitly to an appropriate supported value, choosing numeric
@@ -300,7 +335,7 @@ for _, difference := range differences {
 ```
 
 See the [`ConfigurationInspection.Diff` GoDoc](../../configuration_inspection.go)
-and ConfigKit's [v1.1.0 effective-configuration diff guidance](https://forge.maximumdirect.net/base-layer/configkit/src/tag/v1.1.0/docs/config.md#effective-configuration-diffs)
+and ConfigKit's [effective-configuration diff guidance](https://forge.maximumdirect.net/base-layer/configkit/src/tag/v1.2.0/docs/config.md#effective-configuration-diffs)
 for the exact comparison contract. The operation compares only frozen effective
 configuration values: it does not reread external files or compare their
 contents, resolved credential contents, later execution preparation, or

docs/formats.md

@@ -6,7 +6,7 @@ This is the canonical reference for Promptkit's backend, profile, prompt, and
 schema definitions. The [Go consumer guide](consumers/pkg-promptkit.md) shows
 how to select sources and use an engine; the
 [OpenAI-compatible integration contract](integrations/openai-compatible-chat.md)
-owns outbound wire behavior. [ConfigKit](https://forge.maximumdirect.net/base-layer/configkit/src/tag/v1.1.0/docs/config.md)
+owns outbound wire behavior. [ConfigKit](https://forge.maximumdirect.net/base-layer/configkit/src/tag/v1.2.0/docs/config.md)
 owns the generic YAML grammar, imports, layering, inheritance, and diagnostics.
 This reference describes what Promptkit does with the final effective values.
 
@@ -429,7 +429,7 @@ references are exact IDs and use their qualified form when they select a
 collection resource. There is no Promptkit-specific depth limit or second
 base-chain resolver. Missing references and cycles fail at construction. For
 generic inheritance and layer mechanics, consult
-[ConfigKit](https://forge.maximumdirect.net/base-layer/configkit/src/tag/v1.1.0/docs/config.md).
+[ConfigKit](https://forge.maximumdirect.net/base-layer/configkit/src/tag/v1.2.0/docs/config.md).
 
 ## Schemas
 

docs/internal/sources.md

@@ -36,12 +36,12 @@ owns the exact source-header and collection contracts.
 The `ConfigurationInspection.Diff` facade method compares two retained results
 through a private wrapper and a narrow `internal/configuration.Diff` bridge.
 The wrapper keeps `Result[document]` inside the adapter; the bridge delegates
-once to ConfigKit v1.1.0 and returns its public difference records. Comparison
+once to ConfigKit and returns its public difference records. Comparison
 uses only frozen effective values and does not reopen sources, resolve runtime
 credentials, or enter the execution path. ConfigKit applies sensitivity from
 both results; reports may still contain ordinary application data. See the
 [consumer comparison guide](../consumers/pkg-promptkit.md#inspect-the-captured-configuration)
-and ConfigKit's [v1.1.0 comparison contract](https://forge.maximumdirect.net/base-layer/configkit/src/tag/v1.1.0/docs/config.md#effective-configuration-diffs).
+and ConfigKit's [comparison contract](https://forge.maximumdirect.net/base-layer/configkit/src/tag/v1.2.0/docs/config.md#effective-configuration-diffs).
 
 After resource materialization and effective-profile snapshot construction, the
 adapter captures lexically ordered identity inventories for backends, profiles,

docs/oss/attribution.md

@@ -26,17 +26,17 @@ License and notices: [CC BY-SA 4.0](licenses/CC-BY-SA-4.0.txt) |
 
 ## ConfigKit
 
-Selected module: `go.maximumdirect.net/configkit` at `v1.1.0`.
+Selected module: `go.maximumdirect.net/configkit` at `v1.2.0`.
 
 Copyright (C) 2026 Eric Rakestraw
 
 SPDX-License-Identifier: LGPL-3.0-or-later
 
 License and notices: [LGPL 3.0](../../LICENSE) |
-[COPYRIGHT](https://forge.maximumdirect.net/base-layer/configkit/src/commit/191015e289d7f2b91abb9fdd9c4f2f5cf75b4de9/COPYRIGHT) |
-[LICENSE](https://forge.maximumdirect.net/base-layer/configkit/src/commit/191015e289d7f2b91abb9fdd9c4f2f5cf75b4de9/LICENSE).
+[COPYRIGHT](https://forge.maximumdirect.net/base-layer/configkit/src/commit/c1c7e87f2cdf77a0cbf3327831ac05578e756b9e/COPYRIGHT) |
+[LICENSE](https://forge.maximumdirect.net/base-layer/configkit/src/commit/c1c7e87f2cdf77a0cbf3327831ac05578e756b9e/LICENSE).
 
-[Source](https://forge.maximumdirect.net/base-layer/configkit/src/commit/191015e289d7f2b91abb9fdd9c4f2f5cf75b4de9).
+[Source](https://forge.maximumdirect.net/base-layer/configkit/src/commit/c1c7e87f2cdf77a0cbf3327831ac05578e756b9e).
 
 ## ReleaseKit
 

docs/releases/v0.21.0.md

@@ -0,0 +1,34 @@
+# Promptkit v0.21.0
+
+This minor release updates ConfigKit from v1.1.0 to v1.2.0, making main-relative
+companion imports available through Promptkit's existing configuration-source
+API. The Go consumer minimum remains 1.27.0.
+
+## Main-Relative Companion Imports
+
+Applications can bind a non-file underlay's declared imports to the selected
+main configuration's filesystem context. For example, an application can load
+prompt definitions from an adjacent `prompts/` directory without calculating
+that directory before loading the main configuration.
+
+Imports remain explicitly selected by the caller; the upgrade does not enable
+automatic discovery. Imported prompt message files retain their source-local
+context. The [consumer example](../consumers/pkg-promptkit.md#load-companion-prompts-relative-to-the-main-configuration)
+shows collection mounting and YAML filename filtering. ConfigKit's
+[layered-loading contract](https://forge.maximumdirect.net/base-layer/configkit/src/tag/v1.2.0/docs/config.md#layered-loading)
+defines context selection and fallback behavior.
+
+## Compatibility And Upgrade
+
+Promptkit's exported methods and request shapes are unchanged. No configuration
+format migration is required from v0.20.0. Applications constructing ConfigKit
+`Input` or `LayeredOptions` with positional struct literals must switch to
+field-named literals because those upstream types gained fields. See the
+[ConfigKit release notes](https://forge.maximumdirect.net/base-layer/configkit/src/tag/v1.2.0/docs/releases/v1.2.0.md)
+for upstream changes.
+
+```sh
+go get go.maximumdirect.net/promptkit@v0.21.0
+```
+
+[COPYRIGHT](https://forge.maximumdirect.net/base-layer/promptkit/src/tag/v0.21.0/COPYRIGHT) | [LICENSE](https://forge.maximumdirect.net/base-layer/promptkit/src/tag/v0.21.0/LICENSE) | [ATTRIBUTION](https://forge.maximumdirect.net/base-layer/promptkit/src/tag/v0.21.0/docs/oss/attribution.md)

go.mod

@@ -4,7 +4,7 @@ go 1.27.0
 
 require (
 	github.com/santhosh-tekuri/jsonschema/v6 v6.0.2
-	go.maximumdirect.net/configkit v1.1.0
+	go.maximumdirect.net/configkit v1.2.0
 	go.yaml.in/yaml/v4 v4.0.0-rc.6
 )
 

go.sum

@@ -4,8 +4,8 @@ github.com/santhosh-tekuri/jsonschema/v6 v6.0.2 h1:KRzFb2m7YtdldCEkzs6KqmJw4nqEV
 github.com/santhosh-tekuri/jsonschema/v6 v6.0.2/go.mod h1:JXeL+ps8p7/KNMjDQk3TCwPpBy0wYklyWTfbkIzdIFU=
 github.com/yuin/goldmark/v2 v2.1.6 h1:igy0q9JcqovoFXFx/XjtU8sHVhcUHavPj2sA3EoKJUE=
 github.com/yuin/goldmark/v2 v2.1.6/go.mod h1:G6M4/qOFtfn01/o14BU1UR2Lo5N3S9Qo7xCuz/sHjGQ=
-go.maximumdirect.net/configkit v1.1.0 h1:UzXN2ZMnEkcL0O4YSLqD9qd9M1gb/NWCHQR/H8AaQzA=
-go.maximumdirect.net/configkit v1.1.0/go.mod h1:s1zLJ9GGB/1Q4a+aOHMLISonJxWFgNWpA6SpPlOafeA=
+go.maximumdirect.net/configkit v1.2.0 h1:c4tDJ6Xeh/Jg90UZplLxsnf500lvrZBVj0E3i1ysir8=
+go.maximumdirect.net/configkit v1.2.0/go.mod h1:s1zLJ9GGB/1Q4a+aOHMLISonJxWFgNWpA6SpPlOafeA=
 go.maximumdirect.net/releasekit v0.9.0 h1:sK+Aoj6gS6ATU/1reocjwBekp4YETYENwkcX5ti6mrE=
 go.maximumdirect.net/releasekit v0.9.0/go.mod h1:QE4BLrAhVJTzi+/YTcVl21K/qZp9ojRLg5kuoy3Zb44=
 go.yaml.in/yaml/v4 v4.0.0-rc.6 h1:1h7H1ohdUh93/FyE4YaDa1Zh64K6VVbjF4K6WUxMtH4=