diff --git a/README.md b/README.md
index 3b71f50..feb3bdb 100644
--- a/README.md
+++ b/README.md
@@ -5,29 +5,12 @@
 [![CI](https://github.com/continuous-delphi/delphi-inspect/actions/workflows/ci.yml/badge.svg)](https://github.com/continuous-delphi/delphi-inspect/actions/workflows/ci.yml)
 ![Status](https://img.shields.io/badge/status-incubator-orange)
 ![License](https://img.shields.io/github/license/continuous-delphi/delphi-inspect.svg)
-![Version](https://img.shields.io/badge/version-0.1.0-blue)
 ![Delphi](https://img.shields.io/badge/delphi-red)
 ![PowerShell](https://img.shields.io/badge/powershell-blue)
 ![Continuous Delphi](https://img.shields.io/badge/org-continuous--delphi-red)
 
 Deterministic Delphi toolchain discovery and normalization for Delphi systems.
 
-This repository provides two fully independent implementations that share a mission and a
-contract:
-
-- `source/delphi` -- Native Delphi Windows console executable
-- `source/pwsh` -- Multi-platform PowerShell 7.4+ implementation
-
-Neither implementation is primary. They serve overlapping but distinct audiences and are both
-first-class deliverables.
-
-## PowerShell Compatibility
-
-Runs on the widely available Windows PowerShell 5.1 (`powershell.exe`)
-and the newer PowerShell 7+ (`pwsh`).
-
-Note: the test suite requires `pwsh`.
-
 ## TLDR;
 
 ```powershell
@@ -67,72 +50,14 @@ requiring you to change everything at once.
 
 The goal is _not_ to replace your workflow - the goal is to _incrementally enhance_ it.
 
-## Two Implementations, One Mission
-
-### Delphi executable (`source/delphi`)
-
-**Audience:**
-
-- Security-conscious shops that will not use cloud CI
-- Teams maintaining legacy infrastructure
-- Air-gapped environments
-- Single-developer systems with tribal build knowledge
-- Organizations building their first repeatable build process
-
-**Operational requirements:**
-
-- Windows (Win32/Win64)
-- No PowerShell required
-- No Git required
-
-The Delphi executable embeds the dataset as a compiled resource and requires no external
-files for basic operation. It is a true single-file xcopy deployment.
-
-Dataset resolution priority:
-
-1. `-DataFile <path>` if specified on the command line
-2. `delphi-compiler-versions.json` found alongside the executable
-3. Embedded resource compiled into the executable
-
-This means the executable works out of the box, but can be updated to a newer dataset
-by placing the JSON file alongside it without recompiling. All output indicates which
-data source was used via the `datasetSource` field.
-
-For many shops, this will be the only implementation used.
-
-### PowerShell implementation (`source/pwsh`)
-
-**Audience:**
-
-- Teams using modern CI (GitHub Actions, GitLab CI, Jenkins, etc.)
-- Shops comfortable with scripting
-- Hybrid environments combining scripting and native builds
-
-**Operational requirements:**
-
-- PowerShell 7.4+
-- Windows for registry-based detection commands (RAD Studio currently only installs on Windows)
-
-Dataset resolution priority (if `-DataFile` is not specified):
-
-1. `-DataFile <path>` if specified on the command line
-2. `delphi-compiler-versions.json` found alongside the script
-3. Embedded `here-string` compiled into the script by the generator
-
-**Development and test requirements:**
-
-- PowerShell 7.4+
-- Pester 5.7+
-- CI pins Pester to a specific patch version for reproducibility
+## PowerShell Compatibility
 
-## Shared Contract
+Runs on the widely available Windows PowerShell 5.1 (`powershell.exe`)
+and the newer PowerShell 7+ (`pwsh`).
 
-- Both implementations provide equivalent behavior and identical exit codes for shared commands
-- Human-readable text output may differ between implementations
-- Machine-readable JSON output will remain _semantically equivalent_ across both implementations
-  regardless of formatting or whitespace.
+Note: the test suite requires `pwsh`.
 
-### Shared commands
+## Commands
 
 | Command           | Description                                      |
 |-------------------|--------------------------------------------------|
@@ -142,10 +67,6 @@ Dataset resolution priority (if `-DataFile` is not specified):
 | `DetectLatest`    | Return the single highest-versioned ready install |
 | `Resolve`         | Resolve an alias or VER### to a canonical entry  |
 
-Both implementations use single-dash PascalCase switches (`-Version`, `-ListKnown`).
-This is the recognized PowerShell standard and is adopted for both implementations to
-ensure identical parameter syntax.
-
 See [docs/commands.md](docs/commands.md) for full command reference including switches,
 output formats, exit codes, and any functionality differences between implementations.
 
@@ -159,21 +80,7 @@ output formats, exit codes, and any functionality differences between implementa
 - `json` -- machine envelope with `ok`/`command`/`tool`/`result` structure.
   Suitable for CI pipelines and non-PowerShell consumers.
 
-### -Readiness filter (-ListInstalled only)
-
-`-Readiness` controls which readiness states are included in `-ListInstalled`
-output.  Applies to all formats.  Default is `@('ready')`.
-
-Valid values: `ready`, `partialInstall`, `notFound`, `notApplicable`, `all`.
-
-The special value `all` bypasses filtering entirely and returns every entry.
-Use `-Readiness all` to restore the previous behavior of returning all entries
-regardless of state (prior releases always returned all entries for `-Format json`).
-
-### Machine output contract
-
-When JSON output is requested (`-Format json`), both implementations emit a stable JSON
-envelope.
+### Machine output
 
 Property names in `result` match the dataset field names exactly.
 
@@ -185,7 +92,6 @@ Success (`-Version`):
   "command": "version",
   "tool": {
     "name": "delphi-inspect",
-    "impl": "pwsh|delphi",
     "version": "X.Y.Z"
   },
   "result": {
@@ -204,7 +110,6 @@ Success (`-Resolve`):
   "command": "resolve",
   "tool": {
     "name": "delphi-inspect",
-    "impl": "pwsh|delphi",
     "version": "X.Y.Z"
   },
   "result": {
@@ -229,7 +134,6 @@ Error:
   "command": "version",
   "tool": {
     "name": "delphi-inspect",
-    "impl": "pwsh|delphi",
     "version": "X.Y.Z"
   },
   "error": {
@@ -241,31 +145,28 @@ Error:
 
 ## Dataset
 
-Both implementations consume the canonical dataset from
+The implementations consumes the canonical dataset from
 [delphi-compiler-versions](https://github.com/continuous-delphi/delphi-compiler-versions).
-The JSON dataset is the single source of truth. Version tables should not be duplicated in code.
-During development, the dataset is referenced as a Git submodule.
+The JSON dataset is the single source of truth.
+
+_todo_
 
 The `gen/` folder produces a standalone `pwsh` script with the dataset embedded as a
-PowerShell `here-string`. (The Delphi executable references the dataset directly as a project
-resource.)
+PowerShell `here-string`.
 
-Both standalone artifacts support the same three-tier dataset resolution priority. Placing
-a newer `delphi-compiler-versions.json` alongside either artifact will take precedence over
+Artifacts support the same three-tier dataset resolution priority. A newer
+`delphi-compiler-versions.json` file found will take precedence over
 the embedded data without regenerating or recompiling.
 
 
 ## Maturity
 
-This repository is currently `incubator`. Both implementations are under active development.
-It will graduate to `stable` once:
+This repository is currently `incubator`. It will graduate to `stable` once:
 
-- The shared command contract is considered frozen.
-- Both implementations pass the shared contract test suite.
-- CI is in place for the PowerShell implementation.
+- The command contract is considered frozen.
 - At least one downstream consumer exists.
 
-Until graduation, breaking changes may occur in both implementations.
+Until graduation, breaking changes may occur.
 
 ![continuous-delphi logo](https://continuous-delphi.github.io/assets/logos/continuous-delphi-480x270.png)
 
diff --git a/docs/commands.md b/docs/commands.md
index b91c4f3..5c0a431 100644
--- a/docs/commands.md
+++ b/docs/commands.md
@@ -23,7 +23,7 @@ By default, invoking the script with **no switches** performs the
 
 # Usage
 
-    pwsh ./source/pwsh/delphi-inspect.ps1 [action] [options]
+    pwsh ./source/delphi-inspect.ps1 [action] [options]
 
 ------------------------------------------------------------------------
 
@@ -290,10 +290,6 @@ bypasses filtering entirely and returns every entry regardless of state.
 Default is `@('ready')`, meaning only fully ready installations are
 returned.  Exit code 6 fires when the filtered list is empty.
 
-**Behavior change vs prior releases:** Previous releases always returned
-all entries in JSON format regardless of state.  If you relied on that
-behavior, add `-Readiness all` to restore it.
-
 - `DCC` -- direct invocation of the command-line compiler
   (`dcc32.exe` or `dcc64.exe` depending on platform).  Requires the
   compiler binary and a correctly configured `.cfg` file.
diff --git a/source/pwsh/delphi-inspect.ps1 b/source/delphi-inspect.ps1
similarity index 97%
rename from source/pwsh/delphi-inspect.ps1
rename to source/delphi-inspect.ps1
index fb00f1c..d0adf16 100644
--- a/source/pwsh/delphi-inspect.ps1
+++ b/source/delphi-inspect.ps1
@@ -130,7 +130,7 @@ function Resolve-DefaultDataFilePath {
   # Prefer the submodule layout:
   #   ../delphi-compiler-versions/data/delphi-compiler-versions.json
   # Use Join-Path to remain path-separator-safe if invoked on non-Windows runners.
-  $repoRoot    = Split-Path (Split-Path $scriptDir -Parent) -Parent
+  $repoRoot    = Split-Path $scriptDir -Parent
   $specRoot = Join-Path (Join-Path $repoRoot 'submodules') 'delphi-compiler-versions'
   $dataDir     = Join-Path $specRoot 'data'
   $defaultPath = Join-Path $dataDir 'delphi-compiler-versions.json'
@@ -174,7 +174,7 @@ function Write-JsonError {
   Write-JsonOutput ([pscustomobject]@{
     ok      = $false
     command = $Command
-    tool    = [pscustomobject]@{ name = 'delphi-inspect'; impl = 'pwsh'; version = $ToolVersion }
+    tool    = [pscustomobject]@{ name = 'delphi-inspect'; version = $ToolVersion }
     error   = [pscustomobject]@{ code = $Code; message = $Message }
   } )
 }
@@ -208,7 +208,7 @@ function Write-VersionInfo {
     Write-JsonOutput ([pscustomobject]@{
       ok      = $true
       command = 'version'
-      tool    = [pscustomobject]@{ name = 'delphi-inspect'; impl = 'pwsh'; version = $ToolVersion }
+      tool    = [pscustomobject]@{ name = 'delphi-inspect'; version = $ToolVersion }
       result  = [pscustomobject]@{
         schemaVersion      = $schemaVersion
         dataVersion        = $dataVersion
@@ -278,7 +278,7 @@ function Write-ResolveOutput {
     Write-JsonOutput ([pscustomobject]@{
       ok      = $true
       command = 'resolve'
-      tool    = [pscustomobject]@{ name = 'delphi-inspect'; impl = 'pwsh'; version = $ToolVersion }
+      tool    = [pscustomobject]@{ name = 'delphi-inspect'; version = $ToolVersion }
       result  = [pscustomobject]@{
         verDefine          = $Entry.verDefine
         productName        = $Entry.productName
@@ -343,7 +343,7 @@ function Write-ListKnownOutput {
     Write-JsonOutput ([pscustomobject]@{
       ok      = $true
       command = 'listKnown'
-      tool    = [pscustomobject]@{ name = 'delphi-inspect'; impl = 'pwsh'; version = $ToolVersion }
+      tool    = [pscustomobject]@{ name = 'delphi-inspect'; version = $ToolVersion }
       result  = [pscustomobject]@{
         schemaVersion    = $Data.schemaVersion
         dataVersion      = $Data.dataVersion
@@ -588,7 +588,7 @@ function Write-ListInstalledOutput {
     Write-JsonOutput ([pscustomobject]@{
       ok      = $true
       command = 'listInstalled'
-      tool    = [pscustomobject]@{ name = 'delphi-inspect'; impl = 'pwsh'; version = $ToolVersion }
+      tool    = [pscustomobject]@{ name = 'delphi-inspect'; version = $ToolVersion }
       result  = [pscustomobject]@{
         platform      = $Platform
         buildSystem   = $BuildSystem
@@ -685,7 +685,7 @@ function Write-DetectLatestOutput {
     Write-JsonOutput ([pscustomobject]@{
       ok      = $true
       command = 'detectLatest'
-      tool    = [pscustomobject]@{ name = 'delphi-inspect'; impl = 'pwsh'; version = $ToolVersion }
+      tool    = [pscustomobject]@{ name = 'delphi-inspect'; version = $ToolVersion }
       result  = [pscustomobject]@{
         platform     = $Platform
         buildSystem  = $BuildSystem
diff --git a/tests/pwsh/PSScriptAnalyzer.Tests.ps1 b/tests/pwsh/PSScriptAnalyzer.Tests.ps1
index 47f9163..9e676c5 100644
--- a/tests/pwsh/PSScriptAnalyzer.Tests.ps1
+++ b/tests/pwsh/PSScriptAnalyzer.Tests.ps1
@@ -2,7 +2,7 @@
 #Requires -Modules @{ ModuleName='PSScriptAnalyzer'; ModuleVersion='1.21.0' }
 <#
 .SYNOPSIS
-  PSScriptAnalyzer lint test for source/pwsh/delphi-inspect.ps1
+  PSScriptAnalyzer lint test for source/delphi-inspect.ps1
 
 .DESCRIPTION
   Runs Invoke-ScriptAnalyzer against delphi-inspect.ps1 using the default
diff --git a/tests/pwsh/Resolve-DefaultDataFilePath.Tests.ps1 b/tests/pwsh/Resolve-DefaultDataFilePath.Tests.ps1
index 2b1c2b7..12566ec 100644
--- a/tests/pwsh/Resolve-DefaultDataFilePath.Tests.ps1
+++ b/tests/pwsh/Resolve-DefaultDataFilePath.Tests.ps1
@@ -32,11 +32,11 @@ Describe 'Resolve-DefaultDataFilePath' {
     . $script:scriptUnderTest
   }
 
-  Context 'Given a script path in a standard source/pwsh layout' {
+  Context 'Given a script path in a standard source layout' {
 
     BeforeAll {
       $fakeRepo              = Join-Path ([System.IO.Path]::GetTempPath()) 'delphi-inspect-test-repo'
-      $fakeScriptDir         = Join-Path $fakeRepo 'source' 'pwsh'
+      $fakeScriptDir         = Join-Path $fakeRepo 'source'
       $script:fakeScriptPath = Join-Path $fakeScriptDir 'delphi-inspect.ps1'
       # Create a placeholder file so the guard's Test-Path check passes.
       $null = New-Item -ItemType Directory -Path $fakeScriptDir -Force
diff --git a/tests/pwsh/TestHelpers.ps1 b/tests/pwsh/TestHelpers.ps1
index 325512d..ed031fb 100644
--- a/tests/pwsh/TestHelpers.ps1
+++ b/tests/pwsh/TestHelpers.ps1
@@ -35,7 +35,7 @@
 #   the loaded functions land in the correct scope for It blocks.
 
 function Get-ScriptUnderTestPath {
-  $path = Join-Path $PSScriptRoot '..' '..' 'source' 'pwsh' 'delphi-inspect.ps1'
+  $path = Join-Path $PSScriptRoot '..' '..' 'source' 'delphi-inspect.ps1'
   return [System.IO.Path]::GetFullPath($path)
 }
 
diff --git a/tests/pwsh/Write-JsonError.Tests.ps1 b/tests/pwsh/Write-JsonError.Tests.ps1
index c0a18ae..1393986 100644
--- a/tests/pwsh/Write-JsonError.Tests.ps1
+++ b/tests/pwsh/Write-JsonError.Tests.ps1
@@ -48,10 +48,6 @@ Describe 'Write-JsonError' {
       $script:json.tool.name | Should -Be 'delphi-inspect'
     }
 
-    It 'tool.impl is pwsh' {
-      $script:json.tool.impl | Should -Be 'pwsh'
-    }
-
     It 'tool.version is 0.1.0' {
       $script:json.tool.version | Should -Be '0.1.0'
     }
diff --git a/tests/pwsh/fixtures/detect-registry-error-shim.ps1 b/tests/pwsh/fixtures/detect-registry-error-shim.ps1
index 3d27b38..35cda5c 100644
--- a/tests/pwsh/fixtures/detect-registry-error-shim.ps1
+++ b/tests/pwsh/fixtures/detect-registry-error-shim.ps1
@@ -26,7 +26,7 @@ $ErrorActionPreference = 'Stop'
 # The dot-source guard ($MyInvocation.InvocationName -eq '.') fires and returns
 # before the top-level try/catch, so only functions and variables defined above
 # the guard (including all $Exit* constants) are imported.
-$mainScript = Join-Path $PSScriptRoot '..' '..' '..' 'source' 'pwsh' 'delphi-inspect.ps1'
+$mainScript = Join-Path $PSScriptRoot '..' '..' '..' 'source' 'delphi-inspect.ps1'
 $mainScript = [System.IO.Path]::GetFullPath($mainScript)
 
 # Save the shim's parameter values before dot-sourcing.  When a script is dot-sourced