## Summary
The Electron support added in #247 is **generic Chromium/CDP under the
hood**. The discovery layer probes the Chromium-default CDP port
(`9222`) and any `ARGENT_*_PORTS` entries; the connection picks the
first non-devtools page target; describe is a plain in-page DOM walker;
input/screenshot/screencast/navigation/JS-debugger are all straight CDP.
Nothing in that path is Electron-specific — the only Electron-specific
piece is the *launcher* (`boot-electron.ts`, which resolves and spawns
an Electron binary).
So any Chromium-family runtime exposing a CDP endpoint — an Electron
app, **or** Chrome/Brave/Edge/WebView2 launched with
`--remote-debugging-port` — is discoverable and drivable through the
same tool surface. This PR renames the platform discriminator (and
everything keyed off it) from `electron` to `chromium` so the naming
matches reality.
## What changed
**Public/contract surface (clean hard rename, no back-compat aliases):**
- Platform discriminator `"electron"` → `"chromium"`; device id
`electron-cdp-<port>` → `chromium-cdp-<port>`.
- `ToolCapability.electron` → `.chromium`; the capability-gate rejection
now reads `Tool 'X' is not supported on chromium app`.
- Env `ARGENT_ELECTRON_PORTS`(`_FILE`) →
`ARGENT_CHROMIUM_PORTS`(`_FILE`); ports cache
`~/.argent/electron-cdp-ports.json` → `chromium-cdp-ports.json`; HTTP
surface `/electron-server/` → `/chromium-server/`.
**Files / dirs / symbols:**
- `src/electron-server/` → `src/chromium-server/`; blueprints
`electron-cdp` / `electron-js-runtime-debugger` → `chromium-*`;
`describe`/`open-url`/`launch-app` `platforms/electron.ts` →
`chromium.ts`; `keyboard/electron-keys` → `chromium-keys`;
`utils/electron-discovery` → `chromium-discovery`.
-
`ElectronServer`/`ElectronCdpApi`/`ElectronJsRuntimeDebugger`/`describeElectron`/`discoverElectronDevices`/`ELECTRON_ID_PREFIX`/…
→ `Chromium*` / `CHROMIUM_*`. Tests renamed to match.
**Stays "electron" (the Electron-specific launcher):**
- `boot-device` keeps the `electronAppPath` / `electronPort` /
`electronArgs` inputs, and `boot-electron.ts` still resolves & spawns an
Electron binary. It just yields a `chromium` device now (an Electron app
*is* a Chromium/CDP runtime).
**Skills:** `argent-device-interact`, `argent-metro-debugger`,
`rules/argent.md`, and the RN-workflow reference were reframed to
describe **Chromium (CDP)** availability — Electron apps *plus* any
Chromium browser over CDP (auto-discovered on `9222` /
`ARGENT_CHROMIUM_PORTS`) — instead of Electron only.
## Test plan
- [x] `tsc --build` clean
- [x] `typecheck:tests` clean
- [x] **1116 vitest cases pass (126 files)**
- [x] prettier clean on all changed/renamed files
- [x] Full-repo sweep: every remaining "electron" mention is intentional
(the launcher path + skill prose explaining Electron as one kind of
Chromium/CDP app); `electronic` in LICENSE/COC untouched.
filip131311