chore(log): align levels with the documented convention

Three places disagreed with AGENTS' own level rules: get_chat/get_chat_administrators failures during /set_channel printed at error even though the usual cause is a mistyped channel name the user fixes on the spot (error is reserved for dead letters and the like — now warn, same as other user-served degradations); the edit-before-forward callback arrival line logged at info while the sibling arrival lines for commands and inline queries log at debug (now debug, still carries the escaped payload); and the two upload-fallback lines logged at info while photo.rs's parallel degradations log at warn (now warn both — Telegram failing to fetch our media is a degradation that leaves the user served). AGENTS' convention sentence is now explicit about all three instead of the ambiguous '(fallback, retry enqueue, dead-letter is error)'.

crates/xmedia-bot/src/handlers/callback.rs

@@ -71,7 +71,7 @@ async fn handle_callback(
         return;
     }
 
-    log::info!(
+    log::debug!(
         "callback from {chat_id} on prompt {prompt_message_id}: {}",
         super::log_escape(data)
     );

crates/xmedia-bot/src/handlers/commands.rs

@@ -212,7 +212,7 @@ async fn set_forward_channel_handler(
     }
     let chat = match bot.get_chat(channel.clone()).await {
         Err(e) => {
-            log::error!(
+            log::warn!(
                 "Failed to get channel {}: {}",
                 super::log_escape(&channel.to_string()),
                 e
@@ -227,13 +227,13 @@ async fn set_forward_channel_handler(
     let channel_id = chat.id.0;
     // The sender must be a channel administrator. Compare against the
     // sender's user id, NOT the chat id (they only coincide in private
-    // chats, so the old check broke group usage).
+    // chats), so the old check broke group usage).
     let Some(sender) = message.from.as_ref() else {
         return Err(SetForwardChannelError::NotAdmin);
     };
     match bot.get_chat_administrators(channel.clone()).await {
         Err(e) => {
-            log::error!(
+            log::warn!(
                 "Failed to get channel administrators {}: {}",
                 super::log_escape(&channel.to_string()),
                 e

crates/xmedia-bot/src/send/mod.rs

@@ -511,7 +511,7 @@ pub async fn send_media_sequence(ctx: &AppContext<'_>, task: &Task) -> Result<Ve
                 sent.extend(messages.into_iter().map(|m| m.id.0 as i64));
             }
             Err(RequestError::Api(api)) if is_media_fetch_failure(&api) || is_size_error(&api) => {
-                log::info!(
+                log::warn!(
                     "Telegram could not fetch media for batch {idx} ({}), downloading and reuploading",
                     batch
                         .first()
@@ -604,7 +604,7 @@ pub async fn send_animation(ctx: &AppContext<'_>, task: &Task) -> Result<Vec<i64
             Ok(vec![id])
         }
         Err(RequestError::Api(api)) if is_media_fetch_failure(&api) || is_size_error(&api) => {
-            log::info!(
+            log::warn!(
                 "Telegram could not fetch animation URL, downloading and reuploading: [key={}]",
                 log_key(media_url)
             );