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-chat-state/src/persistence.rs

@@ -0,0 +1,173 @@
+//! Chat persistence trait and mock implementation.
+//!
+//! The actor owns persistence exclusively (`Box<dyn ChatPersistence>`), so the
+//! trait uses `&mut self` — no locks, no atomics, no shared state.
+//! The mock uses a channel to report records to the test, keeping everything
+//! in the actor / message-passing paradigm.
+
+use kigi_sampling_types::ConversationItem;
+use tokio::sync::mpsc;
+
+/// Abstraction over chat-specific persistence operations.
+///
+/// The actor owns this exclusively via `Box<dyn ChatPersistence>`, so all
+/// methods take `&mut self` — no interior mutability needed.
+///
+/// The real implementation wraps an `mpsc::UnboundedSender<PersistenceMsg>`
+/// (which only needs `&self` to send, but `&mut self` is still correct
+/// because the actor is the sole owner).
+pub trait ChatPersistence: Send + 'static {
+    /// Persist a single conversation item (append to chat_history.jsonl).
+    fn persist_message(&mut self, item: &ConversationItem);
+
+    /// Replace the entire chat history (compaction / rewind).
+    fn replace_history(&mut self, items: &[ConversationItem]);
+
+    /// Flush pending writes to disk.
+    fn flush(&mut self);
+}
+
+// ============================================================================
+// Mock (test double) — channel-based, no locks, no atomics
+// ============================================================================
+
+/// A record of a persistence call, sent over a channel to the test.
+#[derive(Debug, Clone)]
+pub enum PersistenceRecord {
+    /// A single message was persisted.
+    Message(ConversationItem),
+    /// The full history was replaced.
+    ReplaceHistory(Vec<ConversationItem>),
+    /// A flush was requested.
+    Flush,
+}
+
+/// Test implementation: sends every call as a [`PersistenceRecord`] over a
+/// channel. The test holds the [`MockPersistenceReceiver`] to inspect what
+/// the actor did. No locks, no atomics — just message passing.
+pub struct MockChatPersistence {
+    tx: mpsc::UnboundedSender<PersistenceRecord>,
+}
+
+/// Receiver side of the mock. Held by the test to drain and inspect records.
+pub struct MockPersistenceReceiver {
+    rx: mpsc::UnboundedReceiver<PersistenceRecord>,
+}
+
+impl MockChatPersistence {
+    /// Create a paired (mock, receiver). Give the mock to the actor, keep the
+    /// receiver in the test.
+    pub fn new() -> (Self, MockPersistenceReceiver) {
+        let (tx, rx) = mpsc::unbounded_channel();
+        (Self { tx }, MockPersistenceReceiver { rx })
+    }
+}
+
+impl MockPersistenceReceiver {
+    /// Drain all pending records from the channel.
+    pub fn drain(&mut self) -> Vec<PersistenceRecord> {
+        let mut records = Vec::new();
+        while let Ok(record) = self.rx.try_recv() {
+            records.push(record);
+        }
+        records
+    }
+
+    /// Collect all `Message` items received so far (drains the channel).
+    pub fn messages(&mut self) -> Vec<ConversationItem> {
+        self.drain()
+            .into_iter()
+            .filter_map(|r| match r {
+                PersistenceRecord::Message(item) => Some(item),
+                _ => None,
+            })
+            .collect()
+    }
+}
+
+impl ChatPersistence for MockChatPersistence {
+    fn persist_message(&mut self, item: &ConversationItem) {
+        let _ = self.tx.send(PersistenceRecord::Message(item.clone()));
+    }
+
+    fn replace_history(&mut self, items: &[ConversationItem]) {
+        let _ = self
+            .tx
+            .send(PersistenceRecord::ReplaceHistory(items.to_vec()));
+    }
+
+    fn flush(&mut self) {
+        let _ = self.tx.send(PersistenceRecord::Flush);
+    }
+}
+
+// ============================================================================
+// Null (noop) — for benchmarks / scenarios where persistence is unwanted
+// ============================================================================
+
+/// No-op implementation: discards everything (for benchmarks / noop scenarios).
+pub struct NullChatPersistence;
+
+impl ChatPersistence for NullChatPersistence {
+    fn persist_message(&mut self, _item: &ConversationItem) {}
+    fn replace_history(&mut self, _items: &[ConversationItem]) {}
+    fn flush(&mut self) {}
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn mock_persistence_records_messages() {
+        let (mut mock, mut rx) = MockChatPersistence::new();
+        let item = ConversationItem::system("test");
+        mock.persist_message(&item);
+        let records = rx.drain();
+        assert_eq!(records.len(), 1);
+        assert!(matches!(&records[0], PersistenceRecord::Message(_)));
+    }
+
+    #[test]
+    fn mock_persistence_records_multiple_messages() {
+        let (mut mock, mut rx) = MockChatPersistence::new();
+        mock.persist_message(&ConversationItem::system("a"));
+        mock.persist_message(&ConversationItem::user("b"));
+        mock.persist_message(&ConversationItem::assistant("c"));
+        assert_eq!(rx.messages().len(), 3);
+    }
+
+    #[test]
+    fn mock_persistence_records_replace_history() {
+        let (mut mock, mut rx) = MockChatPersistence::new();
+        mock.replace_history(&[ConversationItem::system("a"), ConversationItem::system("b")]);
+        let records = rx.drain();
+        assert_eq!(records.len(), 1);
+        match &records[0] {
+            PersistenceRecord::ReplaceHistory(items) => assert_eq!(items.len(), 2),
+            other => panic!("expected ReplaceHistory, got {other:?}"),
+        }
+    }
+
+    #[test]
+    fn mock_persistence_records_flush() {
+        let (mut mock, mut rx) = MockChatPersistence::new();
+        mock.flush();
+        mock.flush();
+        let records = rx.drain();
+        assert_eq!(records.len(), 2);
+        assert!(
+            records
+                .iter()
+                .all(|r| matches!(r, PersistenceRecord::Flush))
+        );
+    }
+
+    #[test]
+    fn null_persistence_does_not_panic() {
+        let mut null = NullChatPersistence;
+        null.persist_message(&ConversationItem::system("test"));
+        null.replace_history(&[ConversationItem::user("a")]);
+        null.flush();
+    }
+}