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-hunk-tracker/src/events.rs

@@ -0,0 +1,74 @@
+//! Events emitted by the HunkTrackerActor.
+
+use serde::{Deserialize, Serialize};
+use std::path::PathBuf;
+use std::sync::Arc;
+
+use crate::types::{Hunk, HunkId, HunkLineInfo, HunkSource};
+
+/// Why a hunk was removed. Used by the LOC sink to decide whether to
+/// negate the hunk's accumulated LOC contribution.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub enum HunkRemovalReason {
+    /// User accepted the hunk — lines are kept in the file and should
+    /// still count toward the author's LOC total.
+    Accepted,
+    /// User rejected/reverted the hunk — changes are undone, LOC should
+    /// be zeroed out.
+    Rejected,
+    /// Hunk was replaced during recomputation (overlapping edit created
+    /// a new hunk), baseline reset, or file cleanup. LOC should be
+    /// zeroed out (the replacement hunk has its own records).
+    Superseded,
+}
+
+/// Events emitted by the HunkTrackerActor when hunks change.
+/// Sent via the update_tx channel to subscribers.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub enum HunkEvent {
+    /// A new hunk was created
+    HunkAdded { path: PathBuf, hunk: Arc<Hunk> },
+
+    /// A hunk was removed.
+    HunkRemoved {
+        path: PathBuf,
+        hunk_id: HunkId,
+        reason: HunkRemovalReason,
+    },
+
+    /// A hunk's position changed but content is the same
+    HunkMoved {
+        path: PathBuf,
+        hunk_id: HunkId,
+        new_line_info: HunkLineInfo,
+    },
+
+    /// A hunk's content changed in place (overlapping region, same hunk ID).
+    /// Emitted when an edit modifies a hunk without fully removing/recreating it.
+    ///
+    /// `trigger_source` is the source of the *edit that triggered* this change
+    /// (before source-preservation logic). This lets LOC tracking attribute
+    /// the change correctly even when the hunk's own `source` field was
+    /// preserved from a prior agent edit.
+    ///
+    /// `prev_lines_added` / `prev_lines_removed` are the line counts from the
+    /// previous version of this hunk, so the LOC sink can compute the delta
+    /// (new - prev) and attribute only the incremental change.
+    HunkContentChanged {
+        path: PathBuf,
+        hunk: Arc<Hunk>,
+        trigger_source: HunkSource,
+        prev_lines_added: usize,
+        prev_lines_removed: usize,
+    },
+
+    /// A file started being tracked
+    FileAdded { path: PathBuf, is_agent_file: bool },
+
+    /// A file stopped being tracked (all hunks gone, not an agent file)
+    FileRemoved { path: PathBuf },
+
+    /// Baseline was updated for a file (after accept or commit)
+    BaselineUpdated { path: PathBuf },
+}