fix: restore console input and attachment workflows

Restore durable busy Submit queues and TUI Enter delivery, expose Web Queue beside Notify, and separate the Composer toolbar from its editor without persistent success notices.

Support pasted image attachments and restore canonical Worker Session uploaded-file operations, including retention, binding, cleanup and authenticated upload context.

Validated Worker, Protocol and Session Store suites, 278 TUI tests, 59 Web tests and Svelte check. Runtime suite could not complete due to external Workdir transport timeouts.

crates/protocol/src/lib.rs

@@ -219,9 +219,9 @@ impl From<WorkerStatus> for WorkerStateSnapshot {
 #[cfg_attr(feature = "json-schema", derive(schemars::JsonSchema))]
 #[serde(tag = "method", content = "params", rename_all = "snake_case")]
 pub enum Method {
-    /// Durably accept typed input for immediate activation while the Worker is Idle.
-    /// Running or Paused Workers reject Submit; use Notify for advisory information
-    /// that should be incorporated into work already in progress.
+    /// Durably accept typed input for immediate activation or the session FIFO.
+    /// Running or Paused Workers queue Submit for a later turn; use Notify for
+    /// advisory information to incorporate into work already in progress.
     ///
     /// `submission_request_id` is generated by the authenticated caller and is
     /// used only for idempotent retry. Worker allocates the durable
@@ -786,8 +786,7 @@ pub enum ToolResultDisposition {
 #[serde(rename_all = "snake_case")]
 pub enum SubmissionDisposition {
     Started,
-    /// Compatibility value for durable receipts created before Submit became
-    /// Idle-only. New submissions are never accepted with this disposition.
+    /// Input is durably held in the session FIFO until eligible for activation.
     Queued,
 }
 
@@ -933,10 +932,9 @@ pub struct SessionToolAttachment {
 #[cfg_attr(feature = "json-schema", derive(schemars::JsonSchema))]
 #[serde(tag = "event", content = "data", rename_all = "snake_case")]
 pub enum Event {
-    /// Durable Submit acceptance. New submissions are accepted only while Idle,
-    /// and a `Started` receipt follows the pending activation checkpoint; the
-    /// corresponding [`Event::UserMessage`] marks the later history commit.
-    /// `Queued` remains readable for receipts persisted by older runtimes.
+    /// Durable Submit acceptance. A `Queued` receipt follows the durable FIFO
+    /// checkpoint. A `Started` receipt follows the pending activation checkpoint;
+    /// the corresponding [`Event::UserMessage`] marks the later history commit.
     /// Repeating the same request id and exact payload returns the same receipt
     /// without appending or activating twice.
     SubmissionAccepted {