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/ai/blocklist/controller/response_stream.rs

@@ -18,7 +18,6 @@ use crate::{
     },
     network::NetworkStatus,
     report_error, send_telemetry_from_ctx,
-    server::server_api::ServerApiProvider,
     settings::ai::AISettings,
 };
 use settings::Setting;
@@ -100,7 +99,6 @@ impl ResponseStream {
             access_key_id: settings.bedrock_access_key_id.value().clone(),
             secret_access_key: settings.bedrock_secret_access_key.value().clone(),
             cross_region_inference: *settings.bedrock_cross_region_inference.value(),
-            fallback_to_warp: *settings.bedrock_fallback_to_warp.value(),
         }.with_external_fallbacks())
     }
 
@@ -110,7 +108,6 @@ impl ResponseStream {
         can_attempt_resume_on_error: bool,
         ctx: &mut ModelContext<Self>,
     ) -> Self {
-        let server_api = ServerApiProvider::as_ref(ctx).get();
         let (cancellation_tx, cancellation_rx) = oneshot::channel();
         let start_time = Local::now();
 
@@ -119,13 +116,7 @@ impl ResponseStream {
         let params_clone = params.clone();
         let _ = ctx.spawn(
             async move {
-                generate_multi_agent_output(
-                    server_api,
-                    bedrock_config,
-                    params_clone,
-                    cancellation_rx,
-                )
-                .await
+                generate_multi_agent_output(bedrock_config, params_clone, cancellation_rx).await
             },
             move |me, stream, ctx| {
                 me.handle_response_stream_result(request_id, stream, ctx);
@@ -194,11 +185,9 @@ impl ResponseStream {
         self.current_request_id = Some(request_id);
         let params = self.params.clone();
         let bedrock_config = Self::bedrock_config_if_applicable(params.model.as_str(), ctx);
-        let server_api = ServerApiProvider::as_ref(ctx).get();
         let _ = ctx.spawn(
             async move {
-                generate_multi_agent_output(server_api, bedrock_config, params, cancellation_rx)
-                    .await
+                generate_multi_agent_output(bedrock_config, params, cancellation_rx).await
             },
             move |me, stream, ctx| {
                 me.handle_response_stream_result(request_id, stream, ctx);