v1.4.0: Auto-compact streaming, Bedrock summarization support, subagent orchestration, and Galaxy rebrand continuation

Major features:
- Auto-compact: triggers conversation summarization when context window >= 85%,
  compacts Bedrock message history to a summary pair, and tracks live context tokens
- Bedrock summarization: plumbs `is_summarization` flag through translator/client/response
  pipeline, handles SummarizeConversation input type, and marks `summarized` in metadata
- Session restore: rebuilds bedrock_message_history from persisted task messages via
  newly-public `convert_proto_message`, preventing empty history on reconnect
- Subagent orchestration: adds SubagentQuestion/Answer/CompletionSummary event types,
  parent-child question routing with depth limits, retry counting, and drain methods
- Summarization UI: inline SummarizationView in AI blocks with progress/finished states

Refactors:
- Rename WarpTheme → GalaxyTheme across ~100 files (rebrand continuation)
- Rename warp_home_config_dir → galaxy_home_config_dir and related path functions
- Predefined rules: replace "System Defined Rule #N" with descriptive names
  (e.g. "Correctness Over Speed", "Never Guess") and add lookup helpers
- Usage view: replace cumulative input/output token display with live context tokens,
  cache hit rate calculation, and separate cache read/write stats
- Telemetry: remove verbose doc comments, simplify trait definitions
- Facts view: simplify delete permission check (always allow local deletion)
- Remove warp_managed_paths_watcher.rs (dead code)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/src/ai/bedrock/response_translator.rs

@@ -65,6 +65,7 @@ pub fn bedrock_stream_to_response_events(
     diagnostic_logger: Option<Arc<BedrockDiagnosticLogger>>,
     messages_sent: Arc<Mutex<Vec<ConversationMessage>>>,
     model_id: String,
+    is_summarization: bool,
 ) -> BoxStream<'static, Event> {
     let request_id = Uuid::new_v4().to_string();
     let conversation_id = Uuid::new_v4().to_string();
@@ -470,6 +471,7 @@ pub fn bedrock_stream_to_response_events(
             cache_read_input_tokens,
             cache_write_input_tokens,
             &model_id,
+            is_summarization,
         );
         yield Ok(finished_event);
     };
@@ -555,6 +557,7 @@ pub(super) fn build_stream_finished(
     cache_read_input_tokens: i32,
     cache_write_input_tokens: i32,
     model_id: &str,
+    is_summarization: bool,
 ) -> ResponseEvent {
     let total_tokens =
         (input_tokens + output_tokens + cache_read_input_tokens + cache_write_input_tokens) as u32;
@@ -598,7 +601,7 @@ pub(super) fn build_stream_finished(
     #[allow(deprecated)]
     let conversation_usage_metadata = Some(stream_finished::ConversationUsageMetadata {
         context_window_usage: context_usage,
-        summarized: false,
+        summarized: is_summarization,
         credits_spent: 0.0,
         token_usage: vec![],
         tool_usage_metadata: None,