M0: compilable skeleton — Kigi 0.1.0 fork surgery

Hard fork of xai-org/grok-build (Apache-2.0) re-targeted as Kigi, an
unofficial Kimi Code CLI community build.

Rename & identity
- 72 xai-*/xai-grok-* crates -> kigi-* (explicit: xai-grok-pager-bin ->
  kigi-bin [binary `kigi`], xai-grok-pager -> kigi-tui; rest mechanical);
  ptyctl, ptyctl-cli, third_party/ unchanged; proto package
  xai.grok.tools.v1 -> kigi.tools.v1
- Config home ~/.kigi (KIGI_SHARE_DIR override), env prefix GROK_* ->
  KIGI_*, `kigi --version` carries the unofficial-community-build notice
- clap identity, help text, startup banner, prompt templates rebranded
  (templates re-encrypted)

Deletions (PRD removal list #5/#6/#7/#9/#10)
- voice input (xai-grok-voice) and all TUI wiring
- telemetry: Mixpanel client, external OTel stream, Sentry, OTLP layers,
  trace/GCS/S3 upload queues (kigi-file-utils halved), workspace upload
  module & dc_log, heap-profile uploader, auth-diagnostics uploader,
  session-analytics halves of feedback; local zero-egress observability
  preserved in new kigi-log crate (unified log, --debug firehose,
  subsystem file logs, opt-in instrumentation)
- announcements (crate, remote-settings fields, TUI surfaces)
- plugin marketplace (crate, sources/browse/CTA/extensions-modal tab);
  direct plugin install/uninstall/update via kigi-agent git_install kept
- relay/gateway/assets endpoints and features (agent relay, headless
  relay transport, gateway bridge, LeaderEnvUrls); leader IPC socket now
  ~/.kigi/leader.sock + KIGI_LEADER_SOCKET, no ws-url derivation
- functional types rehomed instead of deleted: PermissionMode ->
  kigi-config-types, McpInitStrategy -> kigi-mcp, PrCreationSource ->
  session signals, TerminalDiagnostics -> kigi-pager-render, agent_id ->
  shell util

Endpoints
- kigi-env rewritten: single production KigiEndpoints {coding_api_base_url
  https://api.kimi.com/coding/v1 (KIGI_CODE_BASE_URL), oauth_host
  https://auth.kimi.com (KIGI_OAUTH_HOST), update_base_url (GitHub
  Releases API), upgrade_page_url}; GrokBuildEnvironment enum deleted

Toolchain & workspace hygiene
- Rust 1.97.0 pinned; edition 2024; full cargo update; git2 hoisted to
  workspace at 0.21 (Option->Result API migration), quick-xml 0.41
- Root Cargo.toml hand-maintained (PRD §8.1): version 0.1.0 inherited by
  all members, members sorted, unused deps pruned
- cargo-deny advisories gate (deny.toml with documented transitive
  exceptions); CI workflow (check/clippy/fmt/deny/test, macOS+Linux)
- cross-crate test seams re-gated behind `test-support` cargo feature;
  insta snapshot baselines renamed to the kigi_tui prefix
- clippy --workspace --all-targets: zero warnings; fmt clean

Fixes surfaced by the port
- updater probe/installer divergence (bin/kigi vs bin/grok symlink set)
- idle model-metadata refresh dead under KIGI_CODE_BASE_URL override
  (new is_effective_coding_endpoint_url, loopback+override aware)
- macOS symlinked-TMPDIR fixture canonicalization (foreign_sessions,
  fast-worktree); RSS measurement tests serialized via serial_test

Docs & legal (Apache §4)
- NOTICE added (upstream attribution + change statement); THIRD-PARTY
  notices sustained; kigi-tools ported-code notices extended; README,
  CONTRIBUTING, SECURITY, AGENTS.md rewritten

Out of scope for M0 (tracked): Kimi auth/inference (M1), search/fetch,
command parity, config import (M2), Computer Hub excision & final
brand-token sweep (M2), distribution & self-update rewrite (M3).

crates/codegen/kigi-tui/src/unified_log.rs

@@ -0,0 +1,141 @@
+//! Unified log forwarding for the pager.
+//!
+//! Buffers log entries in memory and flushes them to the shell via
+//! `x.ai/log` ACP notifications. Call [`init`] once at startup with
+//! the ACP sender, then use [`info`], [`warn`], [`error`], [`debug`]
+//! from anywhere.
+
+use std::sync::{Mutex, OnceLock};
+
+use agent_client_protocol as acp;
+use kigi_acp_lib::AcpAgentTx;
+use kigi_log::unified_log::{
+    ClientLogEntry, LOG_METHOD, LogLevel, LogNotificationParams, LogSource,
+};
+use tokio::runtime::Handle;
+
+static ACP_TX: OnceLock<AcpAgentTx> = OnceLock::new();
+static BUFFER: Mutex<Vec<ClientLogEntry>> = Mutex::new(Vec::new());
+
+/// Initialize the unified log forwarder with the ACP sender.
+///
+/// Must be called once after the ACP connection is established.
+/// Spawns a background task that flushes buffered entries every few
+/// seconds so events are delivered promptly without manual flush calls.
+/// Entries buffered before this call will be picked up on the first tick.
+pub fn init(tx: AcpAgentTx) {
+    let _ = ACP_TX.set(tx);
+    tokio::spawn(async {
+        let mut interval = tokio::time::interval(std::time::Duration::from_secs(1));
+        interval.set_missed_tick_behavior(tokio::time::MissedTickBehavior::Skip);
+        loop {
+            interval.tick().await;
+            flush();
+        }
+    });
+}
+
+fn now_ts() -> String {
+    chrono::Utc::now().to_rfc3339_opts(chrono::SecondsFormat::Millis, true)
+}
+
+fn push_entry(lvl: LogLevel, msg: &str, sid: Option<&str>, ctx: Option<serde_json::Value>) {
+    let entry = ClientLogEntry {
+        ts: now_ts(),
+        pid: Some(std::process::id()),
+        ver: Some(kigi_version::VERSION.to_owned()),
+        lvl,
+        sid: sid.map(Into::into),
+        msg: msg.into(),
+        ctx,
+    };
+    if let Ok(mut buf) = BUFFER.lock() {
+        buf.push(entry);
+        // Auto-flush when we have a reasonable batch, but only if the ACP
+        // sender is ready -- otherwise keep buffering until an explicit flush().
+        if buf.len() >= 16 && ACP_TX.get().is_some() {
+            let entries: Vec<ClientLogEntry> = buf.drain(..).collect();
+            drop(buf);
+            send_entries(entries);
+        }
+    }
+}
+
+fn build_notification(entries: Vec<ClientLogEntry>) -> Option<acp::ExtNotification> {
+    if entries.is_empty() {
+        return None;
+    }
+    let params = LogNotificationParams {
+        src: LogSource::GrokPager,
+        entries,
+    };
+    let raw = serde_json::value::to_raw_value(&params).ok()?;
+    Some(acp::ExtNotification::new(LOG_METHOD, raw.into()))
+}
+
+fn send_entries(entries: Vec<ClientLogEntry>) {
+    let Some(tx) = ACP_TX.get() else { return };
+    let Some(notification) = build_notification(entries) else {
+        return;
+    };
+    // Guard against panic if called from a non-tokio thread (e.g., a
+    // tracing::Layer callback on a blocking thread).
+    let Ok(handle) = Handle::try_current() else {
+        return;
+    };
+    let tx = tx.clone();
+    handle.spawn(async move {
+        let _ = kigi_acp_lib::acp_send(notification, &tx).await;
+    });
+}
+
+/// Flush any buffered entries to the shell (fire-and-forget).
+pub fn flush() {
+    let entries = {
+        let Ok(mut buf) = BUFFER.lock() else { return };
+        if buf.is_empty() {
+            return;
+        }
+        buf.drain(..).collect::<Vec<_>>()
+    };
+    send_entries(entries);
+}
+
+/// Flush buffered entries and await delivery.
+///
+/// Use this before process exit to ensure entries are delivered
+/// before the agent shuts down.
+pub async fn flush_blocking() {
+    let entries = {
+        let Ok(mut buf) = BUFFER.lock() else { return };
+        if buf.is_empty() {
+            return;
+        }
+        buf.drain(..).collect::<Vec<_>>()
+    };
+    let Some(tx) = ACP_TX.get() else { return };
+    let Some(notification) = build_notification(entries) else {
+        return;
+    };
+    let _ = kigi_acp_lib::acp_send(notification, tx).await;
+}
+
+/// Log an info-level entry.
+pub fn info(msg: &str, sid: Option<&str>, ctx: Option<serde_json::Value>) {
+    push_entry(LogLevel::Info, msg, sid, ctx);
+}
+
+/// Log a warn-level entry.
+pub fn warn(msg: &str, sid: Option<&str>, ctx: Option<serde_json::Value>) {
+    push_entry(LogLevel::Warn, msg, sid, ctx);
+}
+
+/// Log an error-level entry.
+pub fn error(msg: &str, sid: Option<&str>, ctx: Option<serde_json::Value>) {
+    push_entry(LogLevel::Error, msg, sid, ctx);
+}
+
+/// Log a debug-level entry.
+pub fn debug(msg: &str, sid: Option<&str>, ctx: Option<serde_json::Value>) {
+    push_entry(LogLevel::Debug, msg, sid, ctx);
+}