feat(codex): share sessions across terminal and web

Use one native app-server for terminal, Web and phone clients while retaining the existing CLI and Runner lifecycle.

Synchronize native queues, permissions, question history and steering state; preserve explicit permission precedence and per-turn usage models. Resume inactive clear commands through Runner and reject independent child cold resumes.

Add shared-runtime regression tests, generated protocol fixtures and lifecycle documentation.

android/core/protocol/src/main/kotlin/app/hapi/protocol/catalog/Modes.kt

@@ -97,6 +97,10 @@ object PermissionModes {
     /** `isPermissionModeAllowedForFlavor`. */
     fun isAllowedForFlavor(mode: PermissionMode, flavor: String?): Boolean =
         mode in forFlavor(flavor)
+
+    /** New Codex sessions use the shared runtime, without HAPI Safe Yolo. */
+    fun forLaunch(flavor: String?): List<PermissionMode> =
+        forFlavor(flavor).filter { flavor != "codex" || it != PermissionMode.SafeYolo }
 }
 
 /** `CODEX_COLLABORATION_MODES` + labels. */

android/core/protocol/src/main/kotlin/app/hapi/protocol/wire/SessionMetadata.kt

@@ -67,6 +67,7 @@ data class WorktreeMetadata(
 /** `SessionCapabilitiesSchema`. */
 @Serializable
 data class SessionCapabilities(
+    val concurrentClients: Boolean? = null,
     val terminal: Boolean? = null,
     val conversationHistory: ConversationHistoryCapabilities? = null,
 )