§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test could previously reach the real api.moonshot.cn), and the outdated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/examples/hooks/bin/tool-logger.sh

@@ -2,7 +2,7 @@
 # tool-logger.sh — log tool calls to a local activity file
 #
 # Reads the hook envelope from stdin and appends a one-line JSON entry
-# to ~/.grok/tool-activity.log with event name, tool name, and timestamp.
+# to ~/.kigi/tool-activity.log with event name, tool name, and timestamp.
 # `toolName` is the resolved tool (e.g. `linear__save_issue` for MCP calls).
 
 INPUT=$(cat)
@@ -12,7 +12,7 @@ TOOL=$(echo "$INPUT" | grep -o '"toolName":"[^"]*"' | head -1 | sed 's/"toolName
 BACKGROUNDED=$(echo "$INPUT" | grep -o '"isBackgrounded":[a-z]*' | sed 's/"isBackgrounded"://')
 TIMESTAMP=$(date -u +"%Y-%m-%dT%H:%M:%SZ")
 
-LOG_FILE="${HOME}/.grok/tool-activity.log"
+LOG_FILE="${HOME}/.kigi/tool-activity.log"
 mkdir -p "$(dirname "$LOG_FILE")"
 
 echo "{\"timestamp\":\"${TIMESTAMP}\",\"event\":\"${EVENT}\",\"tool\":\"${TOOL}\",\"backgrounded\":${BACKGROUNDED:-false}}" >> "$LOG_FILE"