Remove custom recovery passphrase API from EnterpriseService

These methods gated the feature at runtime. The gate is now a DI binding swap in the enterprise build (EnterpriseSecureBackupSetupEntryPoint replaces the FOSS default), so the EnterpriseService surface and the CustomRecoveryPassphraseStrength result types are no longer needed in FOSS.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

features/enterprise/api/src/main/kotlin/io/element/android/features/enterprise/api/CustomRecoveryPassphraseStrength.kt

@@ -1,35 +0,0 @@
-/*
- * Copyright (c) 2026 Element Creations Ltd.
- *
- * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial.
- * Please see LICENSE files in the repository root for full details.
- */
-
-package io.element.android.features.enterprise.api
-
-/**
- * Strength tier surfaced to the user under a custom recovery passphrase field.
- * The eight tiers mirror iOS `PasswordStrengthThreshold` 1:1 so both clients label a given
- * passphrase identically; each maps to its own label and time-to-crack description in the UI.
- */
-enum class CustomRecoveryPassphraseStrength {
-    Garbage,
-    Weak,
-    Moderate,
-    Okay,
-    Strong,
-    VeryStrong,
-    UltraStrong,
-    Mega,
-}
-
-/**
- * Result of estimating a custom recovery passphrase's strength. The estimation algorithm itself
- * is an enterprise capability ([EnterpriseService.estimateCustomRecoveryPassphraseStrength]); FOSS
- * builds never produce one.
- */
-data class CustomRecoveryPassphraseStrengthResult(
-    val strength: CustomRecoveryPassphraseStrength,
-    /** Fill amount for the progress bar. Always in `0f..1f`. */
-    val score: Float,
-)

features/enterprise/api/src/main/kotlin/io/element/android/features/enterprise/api/EnterpriseService.kt

@@ -41,22 +41,6 @@ interface EnterpriseService {
      */
     fun getNoisyNotificationChannelId(sessionId: SessionId): String?
 
-    /**
-     * Whether the user is allowed to set a custom recovery passphrase.
-     * Enterprise builds gate this in addition to the homeserver's .well-known `customRecoveryPassphraseRequirements`;
-     * when false the setup flow falls back to the auto-generated key path even if the homeserver
-     * advertises a spec.
-     */
-    fun isCustomRecoveryPassphraseEnabled(): Boolean
-
-    /**
-     * Estimate the strength of a user-typed custom recovery [passphrase].
-     * The estimation algorithm is an enterprise capability: FOSS builds return null, so callers
-     * should treat null as "no indicator to show". Callers are responsible for not calling this with
-     * an empty passphrase if they want the indicator hidden while the field is empty.
-     */
-    fun estimateCustomRecoveryPassphraseStrength(passphrase: String): CustomRecoveryPassphraseStrengthResult?
-
     companion object {
         const val ANY_ACCOUNT_PROVIDER = "*"
     }

features/enterprise/impl-foss/src/main/kotlin/io/element/android/features/enterprise/impl/DefaultEnterpriseService.kt

@@ -13,7 +13,6 @@ import dev.zacsweers.metro.AppScope
 import dev.zacsweers.metro.ContributesBinding
 import io.element.android.compound.colors.SemanticColorsLightDark
 import io.element.android.features.enterprise.api.BugReportUrl
-import io.element.android.features.enterprise.api.CustomRecoveryPassphraseStrengthResult
 import io.element.android.features.enterprise.api.EnterpriseService
 import io.element.android.libraries.matrix.api.core.SessionId
 import kotlinx.coroutines.flow.Flow
@@ -46,8 +45,4 @@ class DefaultEnterpriseService : EnterpriseService {
     }
 
     override fun getNoisyNotificationChannelId(sessionId: SessionId): String? = null
-
-    override fun isCustomRecoveryPassphraseEnabled(): Boolean = false
-
-    override fun estimateCustomRecoveryPassphraseStrength(passphrase: String): CustomRecoveryPassphraseStrengthResult? = null
 }

features/enterprise/test/src/main/kotlin/io/element/android/features/enterprise/test/FakeEnterpriseService.kt

@@ -11,7 +11,6 @@ package io.element.android.features.enterprise.test
 import androidx.compose.ui.graphics.Color
 import io.element.android.compound.colors.SemanticColorsLightDark
 import io.element.android.features.enterprise.api.BugReportUrl
-import io.element.android.features.enterprise.api.CustomRecoveryPassphraseStrengthResult
 import io.element.android.features.enterprise.api.EnterpriseService
 import io.element.android.libraries.matrix.api.core.SessionId
 import io.element.android.tests.testutils.lambda.lambdaError
@@ -32,8 +31,6 @@ class FakeEnterpriseService(
     private val unifiedPushDefaultPushGatewayResult: () -> String? = { lambdaError() },
     private val getNoisyNotificationChannelIdResult: (SessionId?) -> String? = { lambdaError() },
     private val tweakMasUrlResult: (String, String) -> String = { _, _ -> lambdaError() },
-    private val isCustomRecoveryPassphraseEnabledResult: Boolean = false,
-    private val estimateCustomRecoveryPassphraseStrengthResult: (String) -> CustomRecoveryPassphraseStrengthResult? = { null },
 ) : EnterpriseService {
     private val brandColorState = MutableStateFlow(initialBrandColor)
     private val semanticColorsState = MutableStateFlow(initialSemanticColors)
@@ -82,9 +79,4 @@ class FakeEnterpriseService(
     override fun getNoisyNotificationChannelId(sessionId: SessionId): String? {
         return getNoisyNotificationChannelIdResult(sessionId)
     }
-
-    override fun isCustomRecoveryPassphraseEnabled(): Boolean = isCustomRecoveryPassphraseEnabledResult
-
-    override fun estimateCustomRecoveryPassphraseStrength(passphrase: String): CustomRecoveryPassphraseStrengthResult? =
-        estimateCustomRecoveryPassphraseStrengthResult(passphrase)
 }