§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test could previously reach the real api.moonshot.cn), and the outdated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/env.rs

@@ -26,28 +26,28 @@ fn target_dir() -> Result<PathBuf> {
 fn local_pager_binary_path() -> Result<PathBuf> {
     Ok(target_dir()?
         .join("debug")
-        .join(format!("kigi-tui{}", std::env::consts::EXE_SUFFIX)))
+        .join(format!("kigi{}", std::env::consts::EXE_SUFFIX)))
 }
 
 fn ensure_local_pager_binary(binary: &std::path::Path) -> Result<()> {
-    if binary.exists() {
-        return Ok(());
-    }
-
+    // Always invoke cargo: an existing binary may be stale relative to the
+    // sources under test (an early-return here once let PTY tests silently
+    // exercise an outdated build). Cargo itself makes this a fast no-op
+    // when the binary is already fresh.
     let cargo = std::env::var("CARGO").unwrap_or_else(|_| "cargo".to_owned());
     let mut cmd = Command::new(&cargo);
     cmd.current_dir(workspace_root()?)
-        .args(["build", "-p", "kigi-bin", "--bin", "kigi-tui"])
+        .args(["build", "-p", "kigi-bin", "--bin", "kigi"])
         .stdin(Stdio::null())
         .envs(kigi_tty_utils::pager_env());
     kigi_tty_utils::detach_std_command(&mut cmd);
     let output = cmd
         .output()
-        .with_context(|| format!("failed to spawn {cargo} to build kigi-tui"))?;
+        .with_context(|| format!("failed to spawn {cargo} to build the kigi binary"))?;
 
     if !output.status.success() {
         bail!(
-            "failed to build kigi-tui (exit {:?})\nstdout:\n{}\nstderr:\n{}",
+            "failed to build the kigi binary (exit {:?})\nstdout:\n{}\nstderr:\n{}",
             output.status.code(),
             String::from_utf8_lossy(&output.stdout),
             String::from_utf8_lossy(&output.stderr),
@@ -55,7 +55,7 @@ fn ensure_local_pager_binary(binary: &std::path::Path) -> Result<()> {
     }
     if !binary.exists() {
         bail!(
-            "kigi-tui build completed but binary missing at {}",
+            "kigi build completed but binary missing at {}",
             binary.display()
         );
     }
@@ -66,9 +66,9 @@ fn ensure_local_pager_binary(binary: &std::path::Path) -> Result<()> {
 ///
 /// Resolution order:
 /// 1. `PAGER_BINARY` env var (for CI / explicit override)
-/// 2. `CARGO_BIN_EXE_kigi-tui` (set by `cargo test`)
+/// 2. `CARGO_BIN_EXE_kigi` (set by `cargo test`)
 /// 3. Build locally via `cargo build -p kigi-bin` (the composition-
-///    root package that owns the `kigi-tui` binary)
+///    root package that owns the `kigi` binary)
 pub fn pager_binary() -> Result<PathBuf> {
     if let Ok(path) = std::env::var("PAGER_BINARY") {
         let p = PathBuf::from(path);
@@ -81,7 +81,7 @@ pub fn pager_binary() -> Result<PathBuf> {
             .with_context(|| format!("failed to absolutize PAGER_BINARY: {}", p.display()));
     }
 
-    if let Ok(path) = std::env::var("CARGO_BIN_EXE_kigi-tui") {
+    if let Ok(path) = std::env::var("CARGO_BIN_EXE_kigi") {
         let p = PathBuf::from(path);
         if p.exists() {
             return Ok(p);