test(telegram): cover draft streaming paths and simplify stream modes

src/config/mod.rs

@@ -10,8 +10,7 @@ pub use schema::{
     PeripheralBoardConfig, PeripheralsConfig, QueryClassificationConfig, ReliabilityConfig,
     ResourceLimitsConfig, RuntimeConfig, SandboxBackend, SandboxConfig, SchedulerConfig,
     SecretsConfig, SecurityConfig, SlackConfig, StreamMode, TelegramConfig, TunnelConfig,
-    WebSearchConfig,
-    WebhookConfig,
+    WebSearchConfig, WebhookConfig,
 };
 
 #[cfg(test)]

src/config/schema.rs

@@ -1449,9 +1449,6 @@ pub enum StreamMode {
     Off,
     /// Update a draft message with every flush interval.
     Partial,
-    /// Update a draft message in larger chunks (reserved for future use;
-    /// currently behaves the same as `Partial`).
-    Block,
 }
 
 fn default_draft_update_interval_ms() -> u64 {