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/skills/skill_utils_tests.rs

@@ -14,18 +14,18 @@ fn test_skill_path_from_file_path_skill_md() {
 
 #[test]
 fn test_skill_path_from_file_path_warp_home_skill() {
-    let Some(warp_home_skills_dir) = galaxy_core::paths::warp_home_skills_dir() else {
+    let Some(galaxy_home_skills_dir) = galaxy_core::paths::galaxy_home_skills_dir() else {
         eprintln!("Skipping test: Warp home skills directory not available");
         return;
     };
-    let warp_home_skill = warp_home_skills_dir
+    let warp_home_skill = galaxy_home_skills_dir
         .join("my-skill")
         .join("assets")
         .join("image.png");
     let result = skill_path_from_file_path(&warp_home_skill);
     assert_eq!(
         result,
-        Some(warp_home_skills_dir.join("my-skill").join("SKILL.md"))
+        Some(galaxy_home_skills_dir.join("my-skill").join("SKILL.md"))
     );
 }