§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test could previously reach the real api.moonshot.cn), and the outdated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-shell/src/terminal/adapter.rs

@@ -217,7 +217,7 @@ async fn poll_for_terminal_exit(
 }
 
 fn wrap_command(command: &str) -> Result<String, ComputerError> {
-    // On Windows the ACP client (grok-desktop) spawns with `shell: true`
+    // On Windows the ACP client (kigi-desktop) spawns with `shell: true`
     // which delegates to cmd.exe.  Wrapping in /bin/bash would fail because
     // that path doesn't exist on Windows.  Send the raw command instead.
     #[cfg(not(unix))]

crates/codegen/kigi-shell/src/terminal/mod.rs

@@ -152,7 +152,7 @@ pub fn color_env() -> std::collections::HashMap<String, String> {
 }
 
 /// Returns environment variables that disable colors and ANSI escape codes in CLI
-/// tool output. Used when the client sets `x.ai/bashOutputNoColor: true` (e.g.
+/// tool output. Used when the client sets `kigi/bashOutputNoColor: true` (e.g.
 /// kigi-tui which renders its own UI and doesn't need raw ANSI codes).
 ///
 /// Follows the <https://no-color.org/> convention plus tool-specific overrides.

crates/codegen/kigi-shell/src/terminal/pty_session.rs

@@ -12,7 +12,7 @@ use tokio::sync::{Mutex, mpsc};
 use crate::extensions::routing::{TargetClientId, send_routed_notification};
 use crate::terminal::{TerminalExtError, TerminalInfo, TerminalStatus};
 
-const NOTIFICATION_METHOD: &str = "x.ai/terminal/pty/notification";
+const NOTIFICATION_METHOD: &str = "kigi/terminal/pty/notification";
 const OUTPUT_RING_BUFFER_SIZE: usize = 256 * 1024;
 const OUTPUT_BATCH_INTERVAL_MS: u64 = 16;
 const BUSY_POLL_INTERVAL_MS: u64 = 500;

crates/codegen/kigi-shell/src/terminal/runner.rs

@@ -21,7 +21,7 @@ pub struct TerminalRunRequest {
     pub timeout: Duration,
     pub output_byte_limit: usize,
     /// Whether to stream output updates and register in the terminal registry.
-    /// - `true`: Agent tool calls (streaming updates, killable via x.ai/terminal/kill)
+    /// - `true`: Agent tool calls (streaming updates, killable via kigi/terminal/kill)
     /// - `false`: Extension methods, git helpers (no updates, not killable)
     pub stream: bool,
     /// Optional file path to write output incrementally (for background tasks).