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-log/src/unified_log.rs

@@ -0,0 +1,505 @@
+//! Centralized unified log for cross-component session observability.
+//!
+//! Shell writes directly via [`emit()`]. Pager and desktop forward entries
+//! over ACP (`x.ai/log` notifications); shell receives them in
+//! [`ingest_client_entries()`] and writes on their behalf.
+
+use std::fs::{self, File, OpenOptions};
+use std::io::Write;
+use std::path::PathBuf;
+use std::sync::{LazyLock, Mutex, OnceLock};
+
+use chrono::Utc;
+use serde::{Deserialize, Serialize};
+
+use kigi_config::kigi_home;
+
+/// Binary version stamped into every log entry. Set once at startup via
+/// [`set_version()`]; entries emitted before that get `None`.
+static VERSION: OnceLock<String> = OnceLock::new();
+
+/// Register the binary version (e.g. shell's `CARGO_PKG_VERSION`).
+/// Call once at startup; subsequent calls are no-ops.
+pub fn set_version(ver: &str) {
+    let _ = VERSION.set(ver.to_owned());
+}
+
+pub const LOG_DIR: &str = "logs";
+const LOG_FILE: &str = "unified.jsonl";
+pub const MAX_SIZE: u64 = 5 * 1024 * 1024; // 5 MB
+
+/// ACP method name for unified log notifications.
+pub const LOG_METHOD: &str = "x.ai/log";
+
+// ---------------------------------------------------------------------------
+// Log entry types
+// ---------------------------------------------------------------------------
+
+/// Log level for a unified log entry.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, strum::Display, Serialize, Deserialize)]
+#[strum(serialize_all = "lowercase")]
+#[serde(rename_all = "lowercase")]
+pub enum LogLevel {
+    Error,
+    Warn,
+    Info,
+    Debug,
+}
+
+/// Component that produced a log entry.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, strum::Display, Serialize, Deserialize)]
+pub enum LogSource {
+    #[strum(serialize = "shell")]
+    #[serde(rename = "shell")]
+    Shell,
+    #[strum(serialize = "grok-pager")]
+    #[serde(rename = "grok-pager")]
+    GrokPager,
+    #[strum(serialize = "grok-desktop")]
+    #[serde(rename = "grok-desktop")]
+    GrokDesktop,
+}
+
+/// A single unified log entry, written as one JSONL line.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct LogEntry {
+    /// RFC 3339 timestamp (millisecond precision, UTC).
+    pub ts: String,
+    /// Component that produced the entry.
+    pub src: LogSource,
+    /// OS process id of the producer. Critical for cross-process trace
+    /// reconstruction because shell/pager/desktop all append to the same
+    /// `unified.jsonl`, so multiple shell processes' lines interleave
+    /// indistinguishably without it.
+    ///
+    /// `Option<u32>` is for wire compatibility only -- shell, pager, and
+    /// desktop all stamp `Some(std::process::id())` at emit time. A
+    /// `None` here means the entry came from an older client/server that
+    /// predates this field; current code never emits one.
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub pid: Option<u32>,
+    /// Binary version (e.g. `"0.1.211"`). Stamped by [`set_version()`]
+    /// at startup so stale zombie processes are identifiable in logs.
+    /// `None` for entries from older binaries that predate this field.
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub ver: Option<String>,
+    /// Log level.
+    pub lvl: LogLevel,
+    /// Session ID, if one exists.
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub sid: Option<String>,
+    /// Human-readable message.
+    pub msg: String,
+    /// Structured context fields.
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub ctx: Option<serde_json::Value>,
+}
+
+/// Wire format for the `x.ai/log` ACP notification params.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct LogNotificationParams {
+    /// Source component identifier.
+    pub src: LogSource,
+    pub entries: Vec<ClientLogEntry>,
+}
+
+/// Entry as sent by a client (no `src` field -- shell stamps it).
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct ClientLogEntry {
+    pub ts: String,
+    /// Client process id. Stamped by the client when the entry is
+    /// created; preserved through ACP forwarding so the on-disk log
+    /// reflects the originating process.
+    ///
+    /// Optional only for wire compatibility with clients that predate
+    /// this field; in-tree clients always populate it.
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub pid: Option<u32>,
+    /// Binary version. Optional for wire compatibility with older clients.
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub ver: Option<String>,
+    pub lvl: LogLevel,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub sid: Option<String>,
+    pub msg: String,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub ctx: Option<serde_json::Value>,
+}
+
+// ---------------------------------------------------------------------------
+// Writer
+// ---------------------------------------------------------------------------
+
+struct LogWriter {
+    file: File,
+    path: PathBuf,
+    written: u64,
+}
+
+static WRITER: LazyLock<Mutex<Option<LogWriter>>> = LazyLock::new(|| Mutex::new(open_writer()));
+
+fn log_path() -> PathBuf {
+    kigi_home().join(LOG_DIR).join(LOG_FILE)
+}
+
+pub fn file_size(path: &std::path::Path) -> u64 {
+    fs::metadata(path).map(|m| m.len()).unwrap_or(0)
+}
+
+fn open_writer() -> Option<LogWriter> {
+    let path = log_path();
+    if let Some(parent) = path.parent()
+        && let Err(e) = fs::create_dir_all(parent)
+    {
+        tracing::warn!("[unified_log] failed to create log dir: {e}");
+        return None;
+    }
+
+    if file_size(&path) >= MAX_SIZE {
+        trim_file(&path);
+    }
+
+    match OpenOptions::new().create(true).append(true).open(&path) {
+        Ok(file) => Some(LogWriter {
+            written: file_size(&path),
+            file,
+            path,
+        }),
+        Err(e) => {
+            tracing::warn!("[unified_log] failed to open log file: {e}");
+            None
+        }
+    }
+}
+
+fn write_lines(lines: &[u8]) {
+    let Ok(mut guard) = WRITER.lock() else { return };
+    let writer = match guard.as_mut() {
+        Some(w) => w,
+        None => return,
+    };
+
+    let len = lines.len() as u64;
+    if let Err(e) = writer.file.write_all(lines) {
+        tracing::warn!("[unified_log] write failed: {e}");
+        return;
+    }
+    writer.written += len;
+
+    // Trim under the lock to avoid a race where concurrent writers see stale
+    // state between drop + re-acquire. Trim is fast (~2.5 MB read+write) and
+    // this is a low-volume diagnostic log.
+    if writer.written >= MAX_SIZE {
+        let _ = writer.file.flush();
+        trim_file(&writer.path);
+        if let Ok(new_file) = OpenOptions::new()
+            .create(true)
+            .append(true)
+            .open(&writer.path)
+        {
+            writer.file = new_file;
+            writer.written = file_size(&writer.path);
+        }
+    }
+}
+
+fn write_entry(entry: &LogEntry) {
+    let Ok(mut line) = serde_json::to_vec(entry) else {
+        return;
+    };
+    line.push(b'\n');
+    write_lines(&line);
+}
+
+/// Drop the oldest lines from the file, keeping roughly the last half.
+///
+/// Uses write-to-temp + rename so a crash mid-trim cannot lose the entire log.
+pub fn trim_file(path: &std::path::Path) {
+    let Ok(data) = fs::read(path) else { return };
+    let half = data.len() / 2;
+    // Find the first newline after the halfway point so we don't split a line.
+    let start = match data[half..].iter().position(|&b| b == b'\n') {
+        Some(pos) => half + pos + 1,
+        None => return,
+    };
+    let tmp = path.with_extension("jsonl.tmp");
+    if fs::write(&tmp, &data[start..]).is_ok() {
+        let _ = fs::rename(&tmp, path);
+    }
+}
+
+// ---------------------------------------------------------------------------
+// Public API
+// ---------------------------------------------------------------------------
+
+/// Return a new timestamp string in the unified log format.
+fn now_ts() -> String {
+    Utc::now().to_rfc3339_opts(chrono::SecondsFormat::Millis, true)
+}
+
+/// Emit a log entry from shell itself.
+pub fn emit(lvl: LogLevel, msg: &str, sid: Option<&str>, ctx: Option<serde_json::Value>) {
+    let entry = LogEntry {
+        ts: now_ts(),
+        src: LogSource::Shell,
+        pid: Some(std::process::id()),
+        ver: VERSION.get().cloned(),
+        lvl,
+        sid: sid.map(Into::into),
+        msg: msg.into(),
+        ctx,
+    };
+    write_entry(&entry);
+}
+
+/// Ingest a batch of log entries from a client (pager or desktop).
+///
+/// Called by the `x.ai/log` notification handler. Entries from
+/// [`LogSource::Shell`] are rejected to prevent spoofing.
+pub fn ingest_client_entries(src: LogSource, entries: &[ClientLogEntry]) {
+    if matches!(src, LogSource::Shell) || entries.is_empty() {
+        return;
+    }
+    // Serialize all entries up front, then write in a single lock acquisition.
+    let mut buf = Vec::new();
+    for client_entry in entries {
+        let entry = LogEntry {
+            ts: client_entry.ts.clone(),
+            src,
+            pid: client_entry.pid,
+            ver: client_entry.ver.clone(),
+            lvl: client_entry.lvl,
+            sid: client_entry.sid.clone(),
+            msg: client_entry.msg.clone(),
+            ctx: client_entry.ctx.clone(),
+        };
+        if let Ok(mut line) = serde_json::to_vec(&entry) {
+            line.push(b'\n');
+            buf.extend_from_slice(&line);
+        }
+    }
+    if !buf.is_empty() {
+        write_lines(&buf);
+    }
+}
+
+/// Convenience: emit an info-level entry from shell.
+pub fn info(msg: &str, sid: Option<&str>, ctx: Option<serde_json::Value>) {
+    emit(LogLevel::Info, msg, sid, ctx);
+}
+
+/// Convenience: emit a warn-level entry from shell.
+pub fn warn(msg: &str, sid: Option<&str>, ctx: Option<serde_json::Value>) {
+    emit(LogLevel::Warn, msg, sid, ctx);
+}
+
+/// Convenience: emit an error-level entry from shell.
+pub fn error(msg: &str, sid: Option<&str>, ctx: Option<serde_json::Value>) {
+    emit(LogLevel::Error, msg, sid, ctx);
+}
+
+/// Convenience: emit a debug-level entry from shell.
+pub fn debug(msg: &str, sid: Option<&str>, ctx: Option<serde_json::Value>) {
+    emit(LogLevel::Debug, msg, sid, ctx);
+}
+
+/// Read the current unified log file and return its contents.
+///
+/// Returns `None` if the log file doesn't exist or can't be read.
+/// Used by diagnostic uploads to capture the log state at a point in time.
+pub fn snapshot_log() -> Option<Vec<u8>> {
+    let path = log_path();
+    // Flush pending writes before reading.
+    if let Ok(mut guard) = WRITER.lock()
+        && let Some(ref mut w) = *guard
+    {
+        let _ = w.file.flush();
+    }
+    // Lock released intentionally — snapshot is approximate.
+    match fs::read(&path) {
+        Ok(data) if !data.is_empty() => Some(data),
+        _ => None,
+    }
+}
+
+/// Read the unified log and return only entries belonging to the given session.
+///
+/// Parses each JSONL line, keeps entries where `"sid"` matches `session_id`,
+/// and returns the filtered lines as JSONL bytes. Returns `None` if the log
+/// is empty or contains no entries for this session.
+pub fn snapshot_session_log(session_id: &str) -> Option<Vec<u8>> {
+    let path = log_path();
+    if let Ok(mut guard) = WRITER.lock()
+        && let Some(ref mut w) = *guard
+    {
+        let _ = w.file.flush();
+    }
+    let data = match fs::read(&path) {
+        Ok(d) if !d.is_empty() => d,
+        _ => return None,
+    };
+    let mut out = Vec::new();
+    for line in data.split(|&b| b == b'\n') {
+        if line.is_empty() {
+            continue;
+        }
+        if let Ok(entry) = serde_json::from_slice::<serde_json::Value>(line)
+            && entry.get("sid").and_then(|v| v.as_str()) == Some(session_id)
+        {
+            out.extend_from_slice(line);
+            out.push(b'\n');
+        }
+    }
+    if out.is_empty() { None } else { Some(out) }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn log_entry_serializes_minimal() {
+        let entry = LogEntry {
+            ts: "2025-07-14T10:30:00.123Z".into(),
+            src: LogSource::Shell,
+            pid: None,
+            ver: None,
+            lvl: LogLevel::Info,
+            sid: None,
+            msg: "test".into(),
+            ctx: None,
+        };
+        let json = serde_json::to_string(&entry).unwrap();
+        assert!(!json.contains("sid"));
+        assert!(!json.contains("ctx"));
+        assert!(!json.contains("pid"));
+        assert!(!json.contains("ver"));
+        assert!(json.contains("\"src\":\"shell\""));
+    }
+
+    #[test]
+    fn log_entry_serializes_full() {
+        let entry = LogEntry {
+            ts: "2025-07-14T10:30:00.123Z".into(),
+            src: LogSource::GrokPager,
+            pid: Some(4242),
+            ver: Some("0.1.211".into()),
+            lvl: LogLevel::Warn,
+            sid: Some("abc123".into()),
+            msg: "connection lost".into(),
+            ctx: Some(serde_json::json!({"retry": 3})),
+        };
+        let json = serde_json::to_string(&entry).unwrap();
+        assert!(json.contains("\"sid\":\"abc123\""));
+        assert!(json.contains("\"retry\":3"));
+        assert!(json.contains("\"pid\":4242"));
+        assert!(json.contains("\"ver\":\"0.1.211\""));
+    }
+
+    #[test]
+    fn client_entry_round_trip() {
+        let wire = r#"{"ts":"2025-07-14T10:30:00.123Z","lvl":"info","msg":"hello"}"#;
+        let entry: ClientLogEntry = serde_json::from_str(wire).unwrap();
+        assert_eq!(entry.msg, "hello");
+        assert!(entry.sid.is_none());
+        assert!(entry.ctx.is_none());
+    }
+
+    #[test]
+    fn trim_file_keeps_recent_half() {
+        let dir = tempfile::tempdir().unwrap();
+        let path = dir.path().join("test.jsonl");
+        let mut content = String::new();
+        for i in 0..10 {
+            content.push_str(&format!("line {i}\n"));
+        }
+        fs::write(&path, &content).unwrap();
+        trim_file(&path);
+        let result = fs::read_to_string(&path).unwrap();
+        // Should keep roughly the second half, starting at a line boundary.
+        assert!(!result.contains("line 0"));
+        assert!(result.contains("line 9"));
+        assert!(result.len() < content.len());
+        // Every line should be complete (no partial lines).
+        for line in result.lines() {
+            assert!(line.starts_with("line "));
+        }
+    }
+
+    #[test]
+    fn trim_file_no_newline_in_second_half_is_noop() {
+        let dir = tempfile::tempdir().unwrap();
+        let path = dir.path().join("test.jsonl");
+        let content = "single-line-no-newline";
+        fs::write(&path, content).unwrap();
+        trim_file(&path);
+        assert_eq!(fs::read_to_string(&path).unwrap(), content);
+    }
+
+    #[test]
+    fn trim_file_missing_file_is_noop() {
+        let dir = tempfile::tempdir().unwrap();
+        let path = dir.path().join("nonexistent.jsonl");
+        trim_file(&path);
+        assert!(!path.exists());
+    }
+
+    #[test]
+    fn ingest_rejects_shell_src() {
+        ingest_client_entries(
+            LogSource::Shell,
+            &[ClientLogEntry {
+                ts: "2025-01-01T00:00:00.000Z".into(),
+                pid: None,
+                ver: None,
+                lvl: LogLevel::Info,
+                sid: None,
+                msg: "sneaky".into(),
+                ctx: None,
+            }],
+        );
+    }
+
+    #[test]
+    fn unknown_src_rejected_at_deserialization() {
+        for bad in &[
+            r#"{"src":"evil","entries":[]}"#,
+            r#"{"src":"","entries":[]}"#,
+            r#"{"src":"GROK-PAGER","entries":[]}"#,
+        ] {
+            assert!(serde_json::from_str::<LogNotificationParams>(bad).is_err());
+        }
+    }
+
+    #[test]
+    fn notification_params_round_trip() {
+        let params = LogNotificationParams {
+            src: LogSource::GrokPager,
+            entries: vec![
+                ClientLogEntry {
+                    ts: "2025-07-14T10:30:00.123Z".into(),
+                    pid: Some(1234),
+                    ver: None,
+                    lvl: LogLevel::Info,
+                    sid: Some("s1".into()),
+                    msg: "first".into(),
+                    ctx: None,
+                },
+                ClientLogEntry {
+                    ts: "2025-07-14T10:30:00.456Z".into(),
+                    pid: Some(1234),
+                    ver: Some("0.1.211".into()),
+                    lvl: LogLevel::Error,
+                    sid: None,
+                    msg: "second".into(),
+                    ctx: Some(serde_json::json!({"code": 42})),
+                },
+            ],
+        };
+        let json = serde_json::to_string(&params).unwrap();
+        let parsed: LogNotificationParams = serde_json::from_str(&json).unwrap();
+        assert_eq!(parsed.entries.len(), 2);
+        assert_eq!(parsed.entries[0].msg, "first");
+        assert_eq!(parsed.entries[1].msg, "second");
+    }
+}