§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test could previously reach the real api.moonshot.cn), and the outdated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-ratatui-inline/src/tests.rs

@@ -206,9 +206,9 @@ mod links {
     #[test]
     fn emits_osc8_around_linked_cells() {
         let mut t = term(20, 3);
-        let out = frame(&mut t, "AB", &[span(0, 2, "https://x.ai", None)]);
+        let out = frame(&mut t, "AB", &[span(0, 2, "https://kimi.com", None)]);
         assert!(
-            out.contains("\x1b]8;;https://x.ai\x07"),
+            out.contains("\x1b]8;;https://kimi.com\x07"),
             "missing open: {out:?}"
         );
         assert!(out.contains("AB"));
@@ -302,7 +302,7 @@ mod links {
     #[test]
     fn link_removed_next_frame_rewrites_cells_without_osc8() {
         let mut t = term(20, 3);
-        let _ = frame(&mut t, "AB", &[span(0, 2, "https://x.ai", None)]);
+        let _ = frame(&mut t, "AB", &[span(0, 2, "https://kimi.com", None)]);
         // Same glyphs, but the link is gone: the cells must be rewritten (so the
         // terminal's hyperlink clears) and carry no OSC 8. This is the `/new`
         // regression — clearing is driven purely by the diff.
@@ -314,9 +314,9 @@ mod links {
     #[test]
     fn unchanged_link_and_content_emits_nothing() {
         let mut t = term(20, 3);
-        let _ = frame(&mut t, "AB", &[span(0, 2, "https://x.ai", None)]);
+        let _ = frame(&mut t, "AB", &[span(0, 2, "https://kimi.com", None)]);
         // Identical glyphs AND identical link → empty diff → no output at all.
-        let out = frame(&mut t, "AB", &[span(0, 2, "https://x.ai", None)]);
+        let out = frame(&mut t, "AB", &[span(0, 2, "https://kimi.com", None)]);
         assert!(out.is_empty(), "expected empty diff, got: {out:?}");
     }
 
@@ -334,9 +334,9 @@ mod links {
     #[test]
     fn emit_id_param_included() {
         let mut t = term(20, 3);
-        let out = frame(&mut t, "AB", &[span(0, 2, "https://x.ai", Some(7))]);
+        let out = frame(&mut t, "AB", &[span(0, 2, "https://kimi.com", Some(7))]);
         assert!(
-            out.contains("\x1b]8;id=7;https://x.ai\x07"),
+            out.contains("\x1b]8;id=7;https://kimi.com\x07"),
             "id param missing: {out:?}"
         );
     }
@@ -376,9 +376,9 @@ mod links {
         let mut t = term(20, 3);
         // A width-2 char occupies two cells; only the lead cell is drawn, and
         // the OSC 8 wraps it.
-        let out = frame(&mut t, "世", &[span(0, 2, "https://x.ai", None)]);
+        let out = frame(&mut t, "世", &[span(0, 2, "https://kimi.com", None)]);
         assert!(
-            out.contains("\x1b]8;;https://x.ai\x07世\x1b]8;;\x07"),
+            out.contains("\x1b]8;;https://kimi.com\x07世\x1b]8;;\x07"),
             "wide-char run: {out:?}"
         );
     }
@@ -404,13 +404,13 @@ mod links {
             row: 5,
             col_start: 2,
             col_end: 4,
-            url: "https://x.ai".into(),
+            url: "https://kimi.com".into(),
             id: None,
         }]);
         t.flush_with_links().unwrap();
         let out = String::from_utf8(t.backend().buf.clone()).unwrap();
         assert!(
-            out.contains("\x1b]8;;https://x.ai\x07AB\x1b]8;;\x07"),
+            out.contains("\x1b]8;;https://kimi.com\x07AB\x1b]8;;\x07"),
             "non-origin mapping: {out:?}"
         );
     }