v1.3.0: Bedrock translator refactor, usage metrics, session restore fixes, and predefined rules

Major changes:

- **Bedrock translator architecture**: Extract orchestration logic from `impl.rs` into
  a dedicated `translator.rs` module. Rename `convert_request.rs` → `request_translator.rs`
  and `stream.rs` → `response_translator.rs` for clarity. Remove `tool_docs.rs` (inlined).
  Remove `fallback_to_warp` setting and server fallback path — Bedrock is now the sole backend.

- **Unknown tool handling**: The response translator now detects hallucinated/unknown tool
  calls from the model and synthesizes error tool_results so the conversation doesn't
  deadlock waiting for a result that will never come.

- **Usage display overhaul**: Replace credit-based usage display with detailed token metrics
  showing context window %, cache hit rate (read/write/miss), and estimated cost in dollars.
  Add `total_input_tokens`, `total_cache_read_tokens`, `total_cache_write_tokens`, and
  `cache_miss_tokens` accessors to `AIConversation`.

- **Predefined rules system**: Add `predefined_rules.rs` with 11 system-defined behavioral
  rules that are auto-seeded on first launch. Add "Add Predefined Rules" button to the
  Rules UI for re-adding them later. Track seeding state via `has_seeded_predefined_rules`
  setting.

- **Session restore improvements**: Rename database file from `warp.sqlite` to
  `galaxy.sqlite` with automatic migration from both same-directory and state_dir legacy
  paths. Improve CWD persistence by falling back to `session_startup_path` for agent-mode
  and fresh tabs. Add extensive session-save/restore logging.

- **Shell bootstrap rebrand**: Rename `WARP_INITIAL_WORKING_DIR` environment variable to
  `GALAXY_INITIAL_WORKING_DIR` across bash, zsh, and fish bootstrap scripts.

- **Model defaults**: Change default Bedrock model from Opus 4.7 to Opus 4.6.
  Add `context_window_for_model()` helper with model-aware context sizes.
  Remove `is_bedrock_model()` (no longer needed without server fallback).

- **User query persistence**: The response translator now emits a `UserQuery` proto message
  at stream start so the user's prompt persists across sessions for conversation titles.

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

app/src/root_view.rs

@@ -770,7 +770,23 @@ fn open_from_restored(arg: &OpenFromRestoredArg, ctx: &mut AppContext) {
         };
 
         // Check whether user has enabled session restoration.
+        if !*GeneralSettings::as_ref(ctx).restore_session {
+            log::info!("[session-restore] restore_session setting is DISABLED, skipping");
+        }
         if *GeneralSettings::as_ref(ctx).restore_session {
+            log::info!(
+                "[session-restore] restoring {} window(s), active_window_index={:?}",
+                app_state.windows.len(),
+                app_state.active_window_index,
+            );
+            for (i, w) in app_state.windows.iter().enumerate() {
+                log::info!(
+                    "[session-restore]   window[{i}]: tabs={} active_tab={} quake={}",
+                    w.tabs.len(),
+                    w.active_tab_index,
+                    w.quake_mode,
+                );
+            }
             let mut active_index = None;
             let mut normal_window_count = 0;
             for (idx, window) in app_state.windows.iter().enumerate() {