§9 acceptance: grep-zero sweep — every internal x.ai/grok identifier renamed

The PRD's first acceptance gate now holds: grep -RinE '\bx\.ai\b|grok'
crates/ --include='*.rs' → 0 matches (exempt: NOTICE and third-party
license archives, README provenance, and the required 'Based on Grok
Build Open Source' attribution, now sourced from version_attribution.txt).

Wire-visible renames (both sides in this repo, changed in lockstep):
- Auth method id 'grok.com' → 'kimi-code' (AuthMethodKind::KimiCode).
- Every x.ai/* and _x.ai/* ACP ext method and meta key → kigi/* /
  _kigi/* (~200 names; grokShell → kigiShell). Session-file replay keeps
  a read-side alias for the legacy '_x.ai/session/update' method so
  existing updates.jsonl histories load; writes emit only the new name
  (both directions test-pinned).
- Agent types grok-build* → kigi* with a documented legacy-prefix alias
  at resolution time so persisted sessions keep resolving.
- ToolNamespace/BuiltinAgentName GrokBuild* → Kigi* (wire snake_case
  kigi/kigi_concise/kigi_hashline; schema regenerated); grok_build
  implementation dirs renamed to kigi*.
- x-grok-* headers → x-kigi-*, __GROK_* sentinels → __KIGI_*, themes
  grokday/groknight → kigiday/kiginight (old persisted values fall back
  to the default theme), web_fetch allowlist xAI hosts → kimi.com +
  moonshot platforms, changelog CDN → this repo, grok-build changelog
  archives deleted.
- BYOK default endpoint removed: [endpoints] api_base_url is now truly
  optional with NO default — consumers fail fast with the flag name when
  unset (no silent x.ai egress). Mock harnesses inject it explicitly.
- System-prompt identity fixed: 'released by xAI' → 'an unofficial
  community CLI for Kimi' (template + regenerated encrypted form).

Also repaired pre-existing grok-era test debt found by the sweep: the
stale trace_classify default-model pin, the grok-pager UA label test,
pty-harness stale-binary reuse and non-hermetic moonshot routing (a PTY
test could previously reach the real api.moonshot.cn), and the outdated
oauth fixture scope key.

Gates: §9 grep 0; fmt clean; workspace check/clippy 0/0 (-D warnings);
FULL cargo test --workspace: 234 suites, 21,961 passed, 0 failed;
deny advisories ok.

crates/codegen/kigi-tui/src/worktree_cmd/mod.rs

@@ -95,7 +95,7 @@ enum WorktreeDbCommand {
 
 pub async fn run(args: WorktreeArgs, agent_config: &AgentConfig) -> Result<()> {
     let cancel = CancellationToken::new();
-    let spawned = crate::acp::spawn::spawn_grok_shell(agent_config.clone(), &cancel, None).await?;
+    let spawned = crate::acp::spawn::spawn_kigi_shell(agent_config.clone(), &cancel, None).await?;
 
     let _init: acp::InitializeResponse = acp_send(
         acp::InitializeRequest::new(acp::ProtocolVersion::V1)
@@ -188,7 +188,7 @@ async fn cmd_list(
 ) -> Result<()> {
     let records: Vec<WorktreeRecord> = ext_call(
         tx,
-        "x.ai/git/worktree/list",
+        "kigi/git/worktree/list",
         &serde_json::json!({
             "repo": repo,
             "type": types,
@@ -208,7 +208,7 @@ async fn cmd_list(
 async fn cmd_show(tx: &kigi_acp_lib::AcpAgentTx, id_or_path: &str) -> Result<()> {
     let rec: Option<WorktreeRecord> = ext_call(
         tx,
-        "x.ai/git/worktree/show",
+        "kigi/git/worktree/show",
         &serde_json::json!({ "idOrPath": id_or_path }),
     )
     .await?;
@@ -239,7 +239,7 @@ async fn cmd_rm(
     for id_or_path in &ids {
         let resp: Result<RemoveResponse> = ext_call(
             tx,
-            "x.ai/git/worktree/remove",
+            "kigi/git/worktree/remove",
             &serde_json::json!({
                 "idOrPath": id_or_path,
                 "force": force,
@@ -271,7 +271,7 @@ async fn cmd_gc(
 ) -> Result<()> {
     let report: GcReport = ext_call(
         tx,
-        "x.ai/git/worktree/gc",
+        "kigi/git/worktree/gc",
         &serde_json::json!({
             "dryRun": dry_run,
             "maxAge": max_age,
@@ -290,7 +290,7 @@ async fn cmd_gc(
 async fn cmd_db(tx: &kigi_acp_lib::AcpAgentTx, command: WorktreeDbCommand) -> Result<()> {
     match command {
         WorktreeDbCommand::Stats => {
-            let stats: DbStats = ext_call(tx, "x.ai/git/worktree/db/stats", &()).await?;
+            let stats: DbStats = ext_call(tx, "kigi/git/worktree/db/stats", &()).await?;
             display::print_stats(&stats);
             Ok(())
         }
@@ -299,12 +299,12 @@ async fn cmd_db(tx: &kigi_acp_lib::AcpAgentTx, command: WorktreeDbCommand) -> Re
             struct PathResp {
                 path: String,
             }
-            let resp: PathResp = ext_call(tx, "x.ai/git/worktree/db/path", &()).await?;
+            let resp: PathResp = ext_call(tx, "kigi/git/worktree/db/path", &()).await?;
             println!("{}", resp.path);
             Ok(())
         }
         WorktreeDbCommand::Rebuild => {
-            let report: RebuildReport = ext_call(tx, "x.ai/git/worktree/db/rebuild", &()).await?;
+            let report: RebuildReport = ext_call(tx, "kigi/git/worktree/db/rebuild", &()).await?;
             display::print_rebuild(&report);
             Ok(())
         }
@@ -318,7 +318,7 @@ mod tests {
     #[test]
     fn ext_request_builds_list_with_filters() {
         let req = ext_request(
-            "x.ai/git/worktree/list",
+            "kigi/git/worktree/list",
             &serde_json::json!({
                 "repo": "xai",
                 "type": ["session"],
@@ -326,7 +326,7 @@ mod tests {
             }),
         )
         .unwrap();
-        assert_eq!(req.method.as_ref(), "x.ai/git/worktree/list");
+        assert_eq!(req.method.as_ref(), "kigi/git/worktree/list");
         let params: serde_json::Value = serde_json::from_str(req.params.get()).unwrap();
         assert_eq!(params["repo"], "xai");
         assert_eq!(params["includeAll"], true);
@@ -335,7 +335,7 @@ mod tests {
     #[test]
     fn ext_request_builds_gc_with_max_age_string() {
         let req = ext_request(
-            "x.ai/git/worktree/gc",
+            "kigi/git/worktree/gc",
             &serde_json::json!({
                 "dryRun": true,
                 "maxAge": "7d",
@@ -351,7 +351,7 @@ mod tests {
     #[test]
     fn ext_request_builds_remove_with_id_or_path() {
         let req = ext_request(
-            "x.ai/git/worktree/remove",
+            "kigi/git/worktree/remove",
             &serde_json::json!({
                 "idOrPath": "wt-abc123",
                 "force": true,
@@ -366,7 +366,7 @@ mod tests {
     #[test]
     fn ext_request_builds_show() {
         let req = ext_request(
-            "x.ai/git/worktree/show",
+            "kigi/git/worktree/show",
             &serde_json::json!({ "idOrPath": "/some/path" }),
         )
         .unwrap();
@@ -376,8 +376,8 @@ mod tests {
 
     #[test]
     fn ext_request_builds_db_stats_empty_params() {
-        let req = ext_request("x.ai/git/worktree/db/stats", &()).unwrap();
-        assert_eq!(req.method.as_ref(), "x.ai/git/worktree/db/stats");
+        let req = ext_request("kigi/git/worktree/db/stats", &()).unwrap();
+        assert_eq!(req.method.as_ref(), "kigi/git/worktree/db/stats");
     }
 
     #[test]