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/appearance.rs

@@ -25,7 +25,7 @@ use crate::{
         active_theme_kind, FontSettings, FontSettingsChangedEvent, MonospaceFontSize, Settings,
         ThemeSettings,
     },
-    themes::theme::{ThemeKind, WarpTheme},
+    themes::theme::{ThemeKind, GalaxyTheme},
     ASSETS,
 };
 
@@ -40,7 +40,7 @@ pub use galaxy_core::ui::appearance::{Appearance, AppearanceEvent};
 pub struct AppearanceManager {
     // The transient theme is a theme that is set by the user but not saved
     // as a setting. It is used when the user is actively choosing a theme.
-    transient_theme: Option<WarpTheme>,
+    transient_theme: Option<GalaxyTheme>,
 
     #[cfg(target_os = "macos")]
     app_icon_at_startup: AppIcon,
@@ -438,10 +438,10 @@ fn build_appearance(ctx: &mut AppContext) -> Appearance {
 }
 
 #[cfg(target_family = "wasm")]
-fn emit_theme_background_event(theme: &WarpTheme) {
+fn emit_theme_background_event(theme: &GalaxyTheme) {
     let bg = theme.background().into_solid();
     let color = format!("#{:02x}{:02x}{:02x}", bg.r, bg.g, bg.b);
-    crate::platform::wasm::emit_event(crate::platform::wasm::WarpEvent::ThemeBackgroundChanged {
+    crate::platform::wasm::emit_event(crate::platform::wasm::GalaxyEvent::ThemeBackgroundChanged {
         color,
     });
 }