§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test could previously reach the real api.moonshot.cn), and the outdated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-hooks/src/matcher.rs

@@ -6,9 +6,9 @@ use regex::Regex;
 ///
 /// - an empty pattern or `"*"` matches every tool;
 /// - a "simple" pattern (only `[A-Za-z0-9_|]`, i.e. a plain name or `|`-list) is an
-///   **exact** match against each name (after external→Grok alias expansion), NOT a regex;
+///   **exact** match against each name (after external→Kigi alias expansion), NOT a regex;
 /// - anything else is an **unanchored** regex (also tested against the tool's external
-///   alias names, so e.g. `^Bash$` matches the Grok tool `run_terminal_command`).
+///   alias names, so e.g. `^Bash$` matches the Kigi tool `run_terminal_command`).
 ///
 /// The simple-vs-regex split is deliberate: it avoids anchoring a `|`-alternation (a
 /// naive `^a|b|c$` anchors only the first/last term and silently over-matches). Whitespace
@@ -61,8 +61,8 @@ fn is_simple_form(pattern: &str) -> bool {
 }
 
 /// Expand a simple-form pattern into the exact set of names it matches: each `|`-term
-/// plus any Grok tool names that term aliases (so `"Bash"` also matches
-/// `run_terminal_command`), per the shared external-name to Grok registry in
+/// plus any Kigi tool names that term aliases (so `"Bash"` also matches
+/// `run_terminal_command`), per the shared external-name to Kigi registry in
 /// `kigi-tools`. Empty terms and duplicates are dropped.
 fn exact_names(pattern: &str) -> Vec<String> {
     let mut names: Vec<String> = Vec::new();
@@ -155,22 +155,22 @@ mod tests {
     // ── External tool-name aliases ────────────────────────────────
 
     #[test]
-    fn claude_bash_matches_grok_tool() {
+    fn claude_bash_matches_kigi_tool() {
         let m = HookMatcher::new("Bash").unwrap();
         assert!(m.is_match("Bash")); // external alias name
-        assert!(m.is_match("run_terminal_command")); // Grok name
+        assert!(m.is_match("run_terminal_command")); // Kigi name
         assert!(!m.is_match("read_file"));
         // Bug-fix regression: exact, not prefix.
         assert!(!m.is_match("run_terminal_command_v2"));
     }
 
     #[test]
-    fn claude_edit_write_matches_grok_tool_exactly() {
+    fn claude_edit_write_matches_kigi_tool_exactly() {
         let m = HookMatcher::new("Edit|Write").unwrap();
         assert!(m.is_match("Edit"));
         assert!(m.is_match("Write"));
-        assert!(m.is_match("search_replace")); // Grok equivalent
-        assert!(m.is_match("hashline_edit")); // second Grok alias
+        assert!(m.is_match("search_replace")); // Kigi equivalent
+        assert!(m.is_match("hashline_edit")); // second Kigi alias
         assert!(!m.is_match("read_file"));
         // The old anchoring bug matched these; the exact-list mode must not.
         assert!(!m.is_match("Editorial"));
@@ -178,7 +178,7 @@ mod tests {
     }
 
     #[test]
-    fn claude_read_matches_grok_tool() {
+    fn claude_read_matches_kigi_tool() {
         let m = HookMatcher::new("Read").unwrap();
         assert!(m.is_match("Read"));
         assert!(m.is_match("read_file"));
@@ -186,8 +186,8 @@ mod tests {
     }
 
     #[test]
-    fn regex_against_claude_alias_matches_grok_tool() {
-        // A regex written against an external alias still matches the Grok tool
+    fn regex_against_claude_alias_matches_kigi_tool() {
+        // A regex written against an external alias still matches the Kigi tool
         // (legacy alias-name expansion).
         let m = HookMatcher::new("^Bash$").unwrap();
         assert!(m.is_match("run_terminal_command"));