Add configuration source reports

docs/cli.md

@@ -147,6 +147,32 @@ one comment line. A provider failure leaves the output stream empty. A rendering
 or output failure may leave an aggregate prefix, and the outcome reports
 incomplete report delivery.
 
+### List configuration sources
+
+`config sources` reports the source inventory captured during the selected
+scope's acquisition. It reads the source facet once and does not reload
+configuration. The default scope is `app`; `--scope all` is unsupported. Text is
+the default format, and `--format yaml` returns a structured report:
+
+```yaml
+scope: app
+sources:
+  - id: source-1
+    label: "application config"
+    path: /etc/example/config.yml
+    layer: base
+    kind: file
+    underlay_index: 0
+    imported_from: null
+```
+
+Each source includes `id`, `label`, `path`, `layer`, `kind`, `underlay_index`,
+and `imported_from`. The import location is null when absent; otherwise it has
+`source_id`, `line`, and `column`. Owning values and source order are preserved,
+including empty fields, zero coordinates, and synthetic sources without paths.
+An empty inventory is `sources: []`. Text output begins with the scope heading
+and then prints the same source fields, quoting labels and paths.
+
 ## Outcome status
 
 CommandKit usage failures use status `2`; operational failures use status `1`.

docs/development.md

@@ -5,8 +5,8 @@ decisions, implementation plans, identity and outcome primitives, typed command
 declarations, an instance-owned registry, a Cobra-backed routing and parsing
 adapter, public `App.Execute` coordination, and generated help/version commands.
 Configuration suite registration, scope discovery, ConfigKit integration,
-validation, and native effective YAML display are implemented; other
-configuration and PromptKit operations remain pending. The
+validation, native effective YAML display, and source inventory reports are
+implemented; other configuration and PromptKit operations remain pending. The
 [README](../README.md) provides project orientation; the
 [documentation policy](policy/documentation.md#canonical-ownership) assigns
 canonical documentation owners.

docs/roadmap/implementation.md

@@ -1,6 +1,6 @@
 # Initial CommandKit implementation plan
 
-Status: implementation underway; Stages 1-9 complete and Stages 10-14 pending.
+Status: implementation underway; Stages 1-10 complete and Stages 11-14 pending.
 
 Date: 2026-10-07.
 
@@ -645,7 +645,7 @@ passes; README, development orientation, and CLI reference describe the feature.
 
 ## Stage 10: implement source inventory reports
 
-**Status:** pending. **Prerequisite:** Stage 9.
+**Status:** complete. **Prerequisite:** Stage 9.
 
 1. Implement single-scope `config sources`, default text with yaml alternative.
    Read the captured SourceReader once. Never reload sources for this report.
@@ -664,6 +664,16 @@ one captured acquisition, YAML field types and import correlation, empty invento
 unsupported all usage preflight, writer failure. Update the source-report CLI
 reference with the implemented shape.
 
+**Completion evidence:** installed `config sources` for scopes declaring the
+capability. The command reads the acquired source facet once and renders explicit
+snake-case YAML DTOs or a quoted text inventory, preserving source order, empty
+and zero values, synthetic paths, and import locations. Checks use a real
+ConfigKit filesystem root, import, overlay, and mapping underlay; they verify the
+YAML field types and import correlation, captured acquisition, empty inventory,
+text quoting, unsupported aggregate preflight, and partial writer failure.
+`go test ./...` passes; README, development orientation, and CLI reference
+describe the report.
+
 ## Stage 11: implement path explanation reports
 
 **Status:** pending. **Prerequisite:** Stage 10.