The store engine moves into the client, and Python goes with it

Reading the catalog, choosing the release that fits this machine, unpacking it,
writing the menu entry and remembering what went where all happen in process now.
There is no interpreter to find, no child process, and no JSON-lines protocol
between the two halves — `PythonEngineProcessRunner`, the runtime locator, the two
engine mappers and the version negotiation are all gone, and with them the one
unchecked cast this codebase had (engine stdout to a typed event).

What that buys a person: on Windows and on a fresh Mac the app simply works. It
used to look for `python3`, `python` and `py -3` and draw a link to python.org
where none answered.

What lands on disk is unchanged, deliberately. `config.json` and `state.json` keep
the shell engine's snake_case shape, its `<scope>:<name>` keys and its file modes,
so a machine whose library was installed by the CLI keeps it — verified against the
Python engine on the same catalog: the same 13-title listing with zero field
differences, byte-identical payloads, identical modes and an identical Info.plist,
and a re-sync over a Python-installed home that writes nothing. Remove, prune,
prune-suppression on a named sync and the v1 state migration were each exercised.

Three things worth knowing about the new code:

  - the zip reader is ~150 lines over `node:zlib`, because Node has none and this
    application has no runtime dependencies. It restores the executable bit from
    each entry's external attributes, without which nothing installed can start,
    and it refuses zip64, unknown compression and paths that escape the
    destination rather than guessing;

  - `SUPPORTED_WARP_ENGINE_VERSIONS` names the engine versions this client is
    written against, checked against the `WarpEngine-Version` header every
    response carries. `selectCatalogDialect` switches over that list exhaustively,
    so adding a version fails the build — type checker and linter both — until
    somebody says what its catalog reads like. An absent header is read as the
    oldest version, which is what an engine before 0.4.0 is;

  - refresh and the language picker are icons at the foot of the side menu now,
    both named for a tooltip and a screen reader, the picker still a real
    `<select>` under its glyph.

The repository is free of Python as well: the Makefile, the CI check and the
release script read package.json and the forge's JSON with Node.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

src/shared/contracts/dto/AppStateDto.ts

@@ -1,6 +1,5 @@
 import type { Locale } from '../../i18n/MessageBundle'
 import type { MessageBundle } from '../../i18n/MessageBundle'
-import type { EngineVersionDto } from './EngineVersionDto'
 import type { InstalledStoreDto } from './InstalledStoreDto'
 
 /** Everything the window needs before it can paint anything. */
@@ -9,12 +8,8 @@ export interface AppStateDto {
   readonly locales: readonly Locale[]
   readonly messages: MessageBundle
   readonly navigationOpen: boolean
-  /** The Python 3 version string, or null when there is none to drive the store. */
-  readonly pythonVersion: string | null
   readonly currentStore: InstalledStoreDto | null
   readonly stores: readonly InstalledStoreDto[]
-  readonly engine: EngineVersionDto | null
-  readonly minimumEngineVersion: string
   readonly registryUrl: string
   readonly defaultStoreRoot: string
   readonly appVersion: string

src/shared/contracts/dto/EngineVersionDto.ts

@@ -1,5 +0,0 @@
-/** The installed engine's version, and whether this client can drive it. */
-export interface EngineVersionDto {
-  readonly text: string
-  readonly supported: boolean
-}

src/shared/contracts/dto/StoreSelectionDto.ts

@@ -1,8 +1,6 @@
-import type { EngineVersionDto } from './EngineVersionDto'
 import type { InstalledStoreDto } from './InstalledStoreDto'
 
-/** The answer to a store switch: which store is open, and can it be driven. */
+/** The answer to a store switch: which store is now open. */
 export interface StoreSelectionDto {
   readonly store: InstalledStoreDto
-  readonly engine: EngineVersionDto | null
 }

src/shared/i18n/EnglishMessages.ts

@@ -25,7 +25,6 @@ export const ENGLISH_MESSAGES = {
   stores: 'Stores',
   addStore: 'Add a store…',
   switchFailed: 'That store could not be opened',
-  actions: 'Actions',
   categories: 'Categories',
   catAll: 'Everything',
   catInstalled: 'Installed',
@@ -45,12 +44,6 @@ export const ENGLISH_MESSAGES = {
   registryFailed: 'The list of stores could not be fetched',
   registryEmpty: 'The list of stores came back empty. Nothing to install from yet.',
   registryRetry: 'Try again',
-  oldEngineTitle: 'The store needs refreshing',
-  oldEngineBody: 'The store engine on this machine is older than this client can drive. Refreshing it downloads the current engine and keeps your settings and installed games.',
-  oldEngineAction: 'Refresh the store',
-  noPythonTitle: 'Python 3 is required',
-  noPythonBody: 'The store is a Python program, so Python 3 has to be installed. Install it, then reopen this window.',
-  pythonLink: 'python.org/downloads',
   paths: 'Where things go',
   openStoreFolder: 'Open the store folder',
   openMenuFolder: 'Open the menu folder',

src/shared/i18n/HungarianMessages.ts

@@ -25,7 +25,6 @@ export const HUNGARIAN_MESSAGES: MessageBundle = {
   stores: 'Store-ok',
   addStore: 'Store hozzáadása…',
   switchFailed: 'Ez a store nem nyitható meg',
-  actions: 'Műveletek',
   categories: 'Kategóriák',
   catAll: 'Minden',
   catInstalled: 'Telepítve',
@@ -45,12 +44,6 @@ export const HUNGARIAN_MESSAGES: MessageBundle = {
   registryFailed: 'A store-ok listája nem érhető el',
   registryEmpty: 'A store-ok listája üresen jött vissza. Egyelőre nincs miből telepíteni.',
   registryRetry: 'Újra',
-  oldEngineTitle: 'A store frissítésre vár',
-  oldEngineBody: 'A gépen lévő store-motor régebbi, mint amit ez a kliens vezérelni tud. A frissítés letölti a mostani motort, a beállításaid és a telepített játékok pedig megmaradnak.',
-  oldEngineAction: 'Store frissítése',
-  noPythonTitle: 'Python 3 kell hozzá',
-  noPythonBody: 'A store egy Python program, tehát Python 3 kell a gépre. Telepítsd, majd nyisd meg újra ezt az ablakot.',
-  pythonLink: 'python.org/downloads',
   paths: 'Hova kerül',
   openStoreFolder: 'Store könyvtár megnyitása',
   openMenuFolder: 'Menü könyvtár megnyitása',