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/terminal/local_tty/unix.rs

@@ -808,7 +808,7 @@ fn build_docker_sandbox_command(
     let sentinel_value = "57265949261";
     builder.env("HISTFILESIZE", sentinel_value);
     builder.env("GALAXY_INITIAL_HISTFILESIZE", sentinel_value);
-    // Intentionally do NOT set `WARP_INITIAL_WORKING_DIR` for sandboxes:
+    // Intentionally do NOT set `GALAXY_INITIAL_WORKING_DIR` for sandboxes:
     // the container's init script cds into the sandbox home dir, not
     // the host's startup dir.
 

app/src/terminal/view.rs

@@ -5636,8 +5636,6 @@ impl TerminalView {
         let estimated_cost_cents: f32 = token_usage_list.iter().map(|u| u.cost_in_cents).sum();
 
         let conversation_usage_info = ConversationUsageInfo {
-            credits_spent: conversation.credits_spent(),
-            credits_spent_for_last_block: conversation.credits_spent_for_last_block(),
             tool_calls: tool_usage.total_tool_calls(),
             models: conversation.token_usage().to_vec(),
             context_window_usage: conversation.context_window_usage(),
@@ -6536,11 +6534,22 @@ impl TerminalView {
                                 .and_then(|data| data.maybe_convert_absolute_path(cwd))
                         })
                 })
-                // Checking if the pwd from the active session actually exists
-                // and if not (ie. directory was removed) - return None.
                 .filter(|path| path.is_dir())
+                // Fall back to the shell's startup directory when no block CWD
+                // is available (e.g. agent mode sessions or freshly opened tabs).
+                .or_else(|| {
+                    self.model
+                        .lock()
+                        .session_startup_path()
+                        .filter(|path| path.is_dir())
+                })
         } else {
-            None
+            // For non-local sessions (viewers, transcript viewers), still try
+            // the startup path so we can persist where the pane was opened.
+            self.model
+                .lock()
+                .session_startup_path()
+                .filter(|path| path.is_dir())
         }
     }