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/pane_group/mod.rs

@@ -113,7 +113,7 @@ use crate::banner::{Banner, BannerEvent, BannerState, BannerTextContent, Dismiss
 use crate::channel::{Channel, ChannelState};
 use crate::code::view::CodeView;
 use crate::drive::items::WarpDriveItemId;
-use crate::drive::{CloudObjectTypeAndId, OpenWarpDriveObjectArgs};
+use crate::drive::{CloudObjectTypeAndId, OpenGalaxyDriveObjectArgs};
 use crate::features::FeatureFlag;
 use crate::launch_configs::launch_config::{self, PaneMode, PaneTemplateType};
 use crate::persistence::ModelEvent;
@@ -522,8 +522,8 @@ pub enum Event {
         /// The session that the path was opened from.
         session: Arc<Session>,
     },
-    OpenWarpDriveLink {
-        open_warp_drive_args: OpenWarpDriveObjectArgs,
+    OpenGalaxyDriveLink {
+        open_warp_drive_args: OpenGalaxyDriveObjectArgs,
     },
     #[cfg(feature = "local_fs")]
     OpenCodeInWarp {
@@ -598,7 +598,7 @@ pub enum Event {
     },
     /// Clears the hovered tab index so it no longer appears as highlighted drop target
     ClearHoveredTabIndex,
-    OpenWarpDriveObjectInPane(ObjectUid),
+    OpenGalaxyDriveObjectInPane(ObjectUid),
     OpenSuggestedAgentModeWorkflowModal {
         workflow_and_id: SuggestedAgentModeWorkflowAndId,
     },