F3: Kimi inference pipeline + full grok cloud-surface excision

Sampler / inference (PRD F3):
- kimi_compat.rs: single adaptation point for the Kimi chat/completions
  dialect (thinking-field mapping, model_id stripping, empty-content
  tool-call message fix, stream_options.include_usage), with kimi-cli
  source citations
- Rate-limit handling reworked for Kimi/Moonshot semantics; UA kigi/{version}
- /models replaces the xAI models-v2 endpoint everywhere; idle model
  refresh carries X-Msh-* device headers only (X-XAI-Token-Auth and
  x-grok-client-mode/CLIENT_MODE_HEADER machinery deleted)

Cloud-surface excision (PRD §5, zero-egress):
- remote/ conversations lane, cli-chat-proxy-types crate, prod/ dir,
  share command, credit bar: deleted (single local session lane;
  paginate() replaces merge_and_paginate)
- Subscription/tier gate stack deleted end-to-end: AppView
  gate/tier/team/ZDR fields, app/subscription.rs watch loop,
  dispatch/billing.rs paywall + SuperGrok upsell, free-usage-exhausted
  chain, tier-restricted commands, GateInfo, RemoteSettings gate fields,
  SettingsUpdateNotification gate fields
- /privacy + coding-data-sharing setting deleted (backed by a dead xAI
  RPC; Kigi is zero-egress — nothing to share or retain remotely)

Auth UX correctness (user-reported):
- Device-flow fixtures now mirror the live Kimi payload shape
  (https://www.kimi.com/code/authorize_device?user_code=..., verified
  against auth.kimi.com); the fabricated auth.kimi.com/device?code=...
  URLs are gone
- open_browser_detached is a no-op under cfg(test): unit tests drove
  wiremock fixture URLs into the real browser (root cause of the
  "garbage mock link" ABCD-1234 tabs)
- Welcome/pager-minimal rebrand: Grok Build -> Kigi, grok.com ->
  kimi.com, "Sign in to Grok" -> "Sign in to Kimi"

crates/codegen/kigi-shell/src/session/storage/jsonl/tests.rs

@@ -1085,7 +1085,7 @@ async fn test_load_prompts_only_large_session() {
 #[tokio::test]
 async fn test_append_feedback_creates_file_and_persists() {
     use crate::session::persistence::{LocalFeedbackEntry, UserFeedbackEntry};
-    use prod_mc_cli_chat_proxy_types::feedback_types::{
+    use crate::session::feedback_types::{
         ClientType, FeedbackSubmission, FeedbackType, RatingType,
     };
     let temp_dir = TempDir::new().unwrap();
@@ -1101,7 +1101,6 @@ async fn test_append_feedback_creates_file_and_persists() {
         dismissed: false,
         submission: Some(FeedbackSubmission {
             session_id: "test-session-123".into(),
-            user_id: None,
             client_type: ClientType::Tui,
             feedback_type: FeedbackType::Rating,
             turn_number: Some(3),
@@ -1109,22 +1108,13 @@ async fn test_append_feedback_creates_file_and_persists() {
             rating_value: Some(1),
             feedback_text: None,
             feedback_categories: vec![],
-            message_id: None,
             model_id: Some("grok-3-fast".into()),
             resolved_model_id: Some("grok-4.5".into()),
             model_fingerprint: None,
             context_type: None,
-            feature_name: None,
-            tool_name: None,
-            experiment_id: None,
-            comparison_id: None,
-            preferred_model_id: None,
-            preference_strength: None,
-            preference_reasons: vec![],
             request_id: None,
             client_version: None,
             shell_version: None,
-            extension_host: None,
             metadata: None,
             last_user_message: None,
             last_assistant_message: None,
@@ -1135,7 +1125,6 @@ async fn test_append_feedback_creates_file_and_persists() {
             context_tokens_used: None,
             context_window_tokens: None,
             terminal_info: None,
-            unified_log_url: None,
         }),
     });
     adapter.append_feedback(&info, &user_entry).await.unwrap();