§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test could previously reach the real api.moonshot.cn), and the outdated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-subagent-resolution/src/overrides.rs

@@ -6,7 +6,7 @@ use std::collections::HashMap;
 use std::path::Path;
 
 use kigi_tool_types::{SubagentCapabilityMode, SubagentIsolationMode};
-use kigi_tools::implementations::grok_build::task::types::SubagentRuntimeOverrides;
+use kigi_tools::implementations::kigi::task::types::SubagentRuntimeOverrides;
 use serde::de::DeserializeOwned;
 
 use crate::config::{SubagentPersona, SubagentRole};
@@ -205,7 +205,7 @@ fn resolve_persona_instructions(
 #[cfg(test)]
 mod tests {
     use super::*;
-    use kigi_tools::implementations::grok_build::task::types::ModelOverrideProvenance;
+    use kigi_tools::implementations::kigi::task::types::ModelOverrideProvenance;
 
     /// Helper to build an overrides struct with only the fields we care about.
     fn make_overrides(
@@ -236,26 +236,26 @@ mod tests {
 
     #[test]
     fn explicit_model_overrides_role() {
-        let overrides = make_overrides(Some("grok-light"), None, None, None, None);
+        let overrides = make_overrides(Some("kigi-light"), None, None, None, None);
         let role = SubagentRole {
-            model: Some("grok-3".into()),
+            model: Some("kigi-3".into()),
             ..Default::default()
         };
         let result =
             resolve_effective_overrides(&overrides, Some(&role), &empty_personas(), None, None);
-        assert_eq!(result.model.as_deref(), Some("grok-light"));
+        assert_eq!(result.model.as_deref(), Some("kigi-light"));
     }
 
     #[test]
     fn role_model_used_when_no_explicit() {
         let overrides = make_overrides(None, None, None, None, None);
         let role = SubagentRole {
-            model: Some("grok-3".into()),
+            model: Some("kigi-3".into()),
             ..Default::default()
         };
         let result =
             resolve_effective_overrides(&overrides, Some(&role), &empty_personas(), None, None);
-        assert_eq!(result.model.as_deref(), Some("grok-3"));
+        assert_eq!(result.model.as_deref(), Some("kigi-3"));
     }
 
     #[test]
@@ -265,13 +265,13 @@ mod tests {
         personas.insert(
             "researcher".to_string(),
             SubagentPersona {
-                model: Some("grok-3-fast".into()),
+                model: Some("kigi-3-fast".into()),
                 instructions: Some("Research things.".into()),
                 ..Default::default()
             },
         );
         let result = resolve_effective_overrides(&overrides, None, &personas, None, None);
-        assert_eq!(result.model.as_deref(), Some("grok-3-fast"));
+        assert_eq!(result.model.as_deref(), Some("kigi-3-fast"));
     }
 
     #[test]
@@ -625,9 +625,9 @@ mod tests {
     fn persona_not_found_error_is_non_fatal() {
         // "not found" is a config-level error: persona_error is set but
         // other fields still resolve from role/overrides.
-        let overrides = make_overrides(Some("grok-3"), Some("missing"), None, None, None);
+        let overrides = make_overrides(Some("kigi-3"), Some("missing"), None, None, None);
         let role = SubagentRole {
-            model: Some("grok-light".into()),
+            model: Some("kigi-light".into()),
             default_isolation: Some("worktree".into()),
             ..Default::default()
         };
@@ -640,7 +640,7 @@ mod tests {
         // Non-fatal: other fields ARE resolved (explicit model takes precedence)
         assert_eq!(
             result.model.as_deref(),
-            Some("grok-3"),
+            Some("kigi-3"),
             "explicit model should resolve despite persona error"
         );
     }
@@ -648,7 +648,7 @@ mod tests {
     #[test]
     fn persona_file_error_returns_early_with_defaults() {
         // File I/O errors ARE fatal: early return with defaults.
-        let overrides = make_overrides(Some("grok-3"), Some("broken"), None, None, None);
+        let overrides = make_overrides(Some("kigi-3"), Some("broken"), None, None, None);
         let dir = tempfile::tempdir().unwrap();
         let mut personas = HashMap::new();
         personas.insert(
@@ -660,7 +660,7 @@ mod tests {
             },
         );
         let role = SubagentRole {
-            model: Some("grok-light".into()),
+            model: Some("kigi-light".into()),
             ..Default::default()
         };
         let result = resolve_effective_overrides(&overrides, Some(&role), &personas, None, None);