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/settings_view/mod.rs

@@ -159,7 +159,7 @@ pub enum SettingsViewEvent {
     StartResize,
     CheckForUpdate,
     LaunchNetworkLogging,
-    OpenWarpDrive,
+    OpenGalaxyDrive,
     SignupAnonymousUser,
     ShowToast {
         message: String,
@@ -989,7 +989,7 @@ pub struct SettingsView {
     /// Mirrored from `Workspace` via [`set_settings_error_state`].
     settings_error_banner_dismissed: bool,
     /// Mouse state handles for the nav-rail footer buttons. Constructed once
-    /// per `SettingsView` per `WARP.md`'s guidance that inline
+    /// per `SettingsView` per `GALAXY.md`'s guidance that inline
     /// `MouseStateHandle::default()` breaks hover/click tracking.
     footer_mouse_states: SettingsFooterMouseStates,
 }