fix(license): recover from stale tokens and cached licenses without manual logout

CLAUDE.md

@@ -94,12 +94,20 @@ There is no `--offline` flag. Instead `container.Start` degrades gracefully when
 
 - **Image pull**: if `rt.PullImage` fails but `rt.ImageExists` reports the image is already present locally, lstk warns and uses the local image instead of failing.
 - **License pre-flight (image already local)**: when a pinned image is already present locally — so `pullImages` won't pull it — `tryPrePullLicenseValidation` skips the pre-flight check entirely (gated on `rt.ImageExists`), since the redundant network round-trip would otherwise block a fully-offline start; the container validates the license at startup. This is symmetric with the skip-pull behaviour above.
-- **License pre-flight (server unreachable)**: when a check does run, `validateLicense` distinguishes a definitive server rejection (`*api.LicenseError`, e.g. HTTP 403/400 — still fatal) from a transport-level failure (any other error — offline/proxy/cert). On a transport failure it skips the pre-flight check and lets the container validate the license at startup.
+- **License pre-flight (server unreachable or erroring)**: when a check does run, `validateLicense` distinguishes a definitive server rejection (`isDefinitiveLicenseRejection`: HTTP 400/401/403 — fatal) from everything else: a transport-level failure (offline/proxy/cert) *and* any non-definitive status (5xx outage, 407 from a corporate proxy, ...) both skip the pre-flight check and let the container validate the license at startup.
 - **License pre-flight (unsupported tag)**: when the server rejects the image tag *format* itself (`IsUnsupportedTag` — a 400 whose detail contains `licensing.license.format`, e.g. `dev` nightlies or custom enterprise-mirror tags), that is not a verdict on the license, so `validateLicense` skips the pre-flight with a warning and lets the container validate the license at startup — the same degradation as a transport failure. Genuine token/subscription rejections stay fatal. The invariant across all these paths: the pre-flight is a fail-fast optimization and must never block a start the container itself would accept.
 - **Telemetry/update checks** are already best-effort and fail silently when offline.
 
 `runtime.PullImage` always closes its `progress` channel (even when `ImagePull` fails early) so the local-image fallback path doesn't leak the progress goroutine. Pair this with a custom `image` in the config to point at a locally loaded image or an internal-registry mirror.
 
+## License errors: cache invalidation and retry (DEVX-658)
+
+A stale cached license (`license.json`) or a stale token (e.g. one that predates a license purchase) must never require a manual `lstk logout` to recover:
+
+- **Definitive rejection (HTTP 400/401/403) in the pre-flight**: `validateLicense` deletes the cached `license.json` (the verdict invalidates it — a later start whose pre-flight is skipped must not keep mounting the stale copy). In interactive mode, `container.Start` then prompts to log in again (`auth.Relogin`: drops the stored token + cached license, reruns the browser login) and retries the start once with the fresh token. In non-interactive mode it emits an `ErrorEvent` pointing at `lstk logout && lstk login` / `LOCALSTACK_AUTH_TOKEN` and returns a silent error.
+- **Startup license failure with a stale mounted cache**: when the container exits with license-related logs (`licenseStartupError` from `awaitStartup`) while a cached `license.json` that this run did *not* refresh was mounted (pre-flight skipped, e.g. image already local), `startWithLicenseRetry` drops the cache, re-validates against the license server (forced, bypassing the image-local skip), and retries the start once. No retry when the license was freshly fetched this run or no cache was mounted.
+- `StartOptions.AuthOptions` threads `auth.Option`s (e.g. `WithBrowserOpener`) into the internally constructed `auth.Auth` so tests of the re-login path never open a real browser tab.
+
 # Emulator Setup Commands
 
 Use `lstk setup <emulator>` to set up CLI integration for an emulator type:

internal/auth/auth.go

@@ -61,6 +61,29 @@ func (a *Auth) GetToken(ctx context.Context) (string, error) {
 		return "", fmt.Errorf("authentication required: set LOCALSTACK_AUTH_TOKEN or run in interactive mode")
 	}
 
+	return a.loginAndStore(ctx)
+}
+
+// Relogin discards the stored auth token and cached license file, then runs the
+// login flow again. Used when the platform definitively rejects the current
+// token (e.g. it predates a license purchase), so the user doesn't have to run
+// `lstk logout` manually before retrying.
+func (a *Auth) Relogin(ctx context.Context) (string, error) {
+	if !a.allowLogin {
+		return "", fmt.Errorf("authentication required: set LOCALSTACK_AUTH_TOKEN or run in interactive mode")
+	}
+
+	if err := a.tokenStorage.DeleteAuthToken(); err != nil && !errors.Is(err, ErrTokenNotFound) {
+		a.sink.Emit(output.MessageEvent{Severity: output.SeverityWarning, Text: fmt.Sprintf("could not remove stored token: %v", err)})
+	}
+	if a.licenseFilePath != "" {
+		_ = os.Remove(a.licenseFilePath)
+	}
+
+	return a.loginAndStore(ctx)
+}
+
+func (a *Auth) loginAndStore(ctx context.Context) (string, error) {
 	token, err := a.login.Login(ctx)
 	if err != nil {
 		if errors.Is(err, context.Canceled) {

internal/auth/auth_test.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"os"
+	"path/filepath"
 	"strings"
 	"testing"
 
@@ -57,3 +58,43 @@ func TestGetToken_ReturnsTokenWhenKeyringStoreFails(t *testing.T) {
 		return false
 	})
 }
+
+func TestRelogin_DiscardsTokenAndLicenseThenLogsIn(t *testing.T) {
+	ctrl := gomock.NewController(t)
+	mockStorage := NewMockAuthTokenStorage(ctrl)
+	mockLogin := NewMockLoginProvider(ctrl)
+
+	licensePath := filepath.Join(t.TempDir(), "license.json")
+	if err := os.WriteFile(licensePath, []byte(`{"license":"stale"}`), 0600); err != nil {
+		t.Fatal(err)
+	}
+
+	auth := &Auth{
+		tokenStorage:    mockStorage,
+		login:           mockLogin,
+		sink:            output.SinkFunc(func(output.Event) {}),
+		allowLogin:      true,
+		licenseFilePath: licensePath,
+	}
+
+	mockStorage.EXPECT().DeleteAuthToken().Return(nil)
+	mockLogin.EXPECT().Login(gomock.Any()).Return("fresh-token", nil)
+	mockStorage.EXPECT().SetAuthToken("fresh-token").Return(nil)
+
+	token, err := auth.Relogin(context.Background())
+
+	assert.NoError(t, err)
+	assert.Equal(t, "fresh-token", token)
+	assert.NoFileExists(t, licensePath, "relogin must drop the cached license file")
+}
+
+func TestRelogin_FailsWhenLoginNotAllowed(t *testing.T) {
+	auth := &Auth{
+		sink:       output.SinkFunc(func(output.Event) {}),
+		allowLogin: false,
+	}
+
+	_, err := auth.Relogin(context.Background())
+
+	assert.ErrorContains(t, err, "authentication required")
+}