Remove API key requirement

AGENTS.md

@@ -33,23 +33,8 @@ cmake -S . -B build -G Ninja -DCMAKE_BUILD_TYPE=Debug -DAPP_VERSION="1.2.3"
 The Nix package bakes `-DAPP_VERSION=<pkg version>` via `cmakeFlags` (`version`
 defaults to `0.1.0` in `nix/package.nix`; the flake overrides it from the
 `APP_VERSION` env var on impure evals). `nix develop`
-sets `APP_VERSION=dev` and exports `API_KEY` from the ambient environment
-(falling back to `RWT_LIVE_API_KEY`). CMake seeds a *fresh* configure from the
-`APP_VERSION` / `API_KEY` env vars; `-D` wins on reconfigure.
-
-The portal API key is also a build-time argument: `-DAPI_KEY="..."` (CMake) or
-`apiKey` on `callPackage` (Nix). It is compiled into the binary as the
-`Authorization: Bearer` token and defaults to empty (no auth header). Keep the
-real value in CI secrets, never in source — rotate by rebuilding with a new
-key.
-
-Version and API key can be baked in together with a single configure:
-
-```sh
-cmake -S . -B build -G Ninja -DCMAKE_BUILD_TYPE=Debug \
-  -DAPP_VERSION="1.2.3" \
-  -DAPI_KEY="$API_KEY"
-```
+sets `APP_VERSION=dev`. CMake seeds a *fresh* configure from the
+`APP_VERSION` env var; `-D` wins on reconfigure.
 
 - The app resolves `assets/...` relative to its working directory — launch
   `./build/radiantwave` from the repo root. (The Nix wrapper chdirs to
@@ -238,14 +223,11 @@ cached.
   `checks` is keyed per-system, so the workflow resolves the current system
   via `nix eval --impure --expr 'builtins.currentSystem'`). The build bakes
   in a per-branch `APP_VERSION` — the current git tag on `main`, the current
-  commit hash on `dev` — plus the portal API key from the `RWT_API_KEY`
-  secret. The flake reads `APP_VERSION`/`API_KEY` from the environment via
+  commit hash on `dev`. The flake reads `APP_VERSION` from the environment via
   `builtins.getEnv`, so the build must pass `--impure` (pure evals get the
-  package defaults). When the `RWT_LIVE_API_KEY` secret is set it also runs
-  `test_api_client` / `test_license_service` against the portal via
-  `nix develop` (outside the sandbox, like a dev machine). Those live tests
-  also need `RWT_LIVE_ACCOUNT_EMAIL`, `RWT_LIVE_LICENSE_EMAIL`, and
-  `RWT_LIVE_LICENSE_KEY`.
+  package defaults). The live portal tests run from `nix develop` when the
+  `RWT_LIVE_*` secrets are set and need `RWT_LIVE_ACCOUNT_EMAIL`,
+  `RWT_LIVE_LICENSE_EMAIL`, and `RWT_LIVE_LICENSE_KEY`.
 - `test_assets` must pass before committing — it catches missing fonts/images
   that break the app at runtime.
 - `cmake --build build` builds everything; pass `--target <name>` to build one