§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test could previously reach the real api.moonshot.cn), and the outdated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-pager-pty-harness/src/content.rs

@@ -92,6 +92,11 @@ impl ContentController {
             ("KIGI_SHARE_DIR".into(), kigi_home),
             ("KIGI_CODE_BASE_URL".into(), self.url()),
             ("KIGI_API_BASE_URL".into(), self.url()),
+            // Hermeticity: bundled open-platform (moonshot) model entries
+            // carry real platform base URLs; the documented dev/test override
+            // pins them to the mock so no PTY test can reach a live endpoint.
+            ("KIGI_MOONSHOT_CN_BASE_URL".into(), self.url()),
+            ("KIGI_MOONSHOT_AI_BASE_URL".into(), self.url()),
             ("XAI_API_KEY".into(), "test-key-for-ci".into()),
             ("KIGI_TELEMETRY_ENABLED".into(), "false".into()),
             ("KIGI_FEEDBACK_ENABLED".into(), "false".into()),
@@ -210,7 +215,7 @@ mod tests {
 
     /// The pre-delegation mock always served 200 `{"allow_access": true}`;
     /// the shared server defaults to 404-until-set. A 404 strands the pager
-    /// on the SuperGrok upsell screen and breaks every PTY test.
+    /// on the subscription upsell screen and breaks every PTY test.
     #[tokio::test]
     async fn settings_endpoint_allows_access_by_default() {
         let content = ContentController::start().await.unwrap();
@@ -280,12 +285,14 @@ mod tests {
         );
         assert_eq!(get("KIGI_CODE_BASE_URL"), Some(content.url()));
         assert_eq!(get("KIGI_API_BASE_URL"), Some(content.url()));
+        assert_eq!(get("KIGI_MOONSHOT_CN_BASE_URL"), Some(content.url()));
+        assert_eq!(get("KIGI_MOONSHOT_AI_BASE_URL"), Some(content.url()));
         assert_eq!(get("XAI_API_KEY").as_deref(), Some("test-key-for-ci"));
         assert_eq!(get("KIGI_TELEMETRY_ENABLED").as_deref(), Some("false"));
         assert_eq!(get("KIGI_FEEDBACK_ENABLED").as_deref(), Some("false"));
         assert_eq!(get("KIGI_TRACE_UPLOAD").as_deref(), Some("false"));
         assert_eq!(get("KIGI_PROMPT_SUGGESTIONS").as_deref(), Some("false"));
         assert_eq!(get("KIGI_MAX_RETRIES").as_deref(), Some("0"));
-        assert_eq!(env.len(), 10, "env list must not silently grow or shrink");
+        assert_eq!(env.len(), 12, "env list must not silently grow or shrink");
     }
 }