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-fsnotify/src/event.rs

@@ -0,0 +1,76 @@
+//! Public event types — the wire contract for `kigi-fsnotify`.
+//!
+//! Pure data: no I/O, no tokio, no intra-crate deps. Safe to lift into a
+//! sibling `-types` crate for WASM/no-tokio consumers.
+//!
+//! All variants are `#[non_exhaustive]`; add additively. The workspace
+//! translator (in `kigi-workspace`) maps these to
+//! `WorkspaceEvent`s and enriches `GitOperationCompleted { head_changed:
+//! true }` with `commit + branch + vcs` via a git shell-out — that I/O
+//! belongs at the workspace layer, not on the OS-watcher hot path.
+
+use std::path::PathBuf;
+
+/// One semantic event from the local workspace. Causal order on the
+/// source's broadcast channel. `FilesChanged` paths share a single `kind`
+/// (per-debounce-window grouping); per-event causality would need
+/// `Vec<{path, kind}>`.
+#[derive(Debug, Clone, PartialEq, Eq, serde::Serialize, serde::Deserialize)]
+#[serde(tag = "type", content = "data", rename_all = "snake_case")]
+#[non_exhaustive]
+pub enum FsEvent {
+    /// Workspace file changes; all paths share `kind`. Paths under
+    /// `git_dir` are excluded (metadata surfaces as `GitMetaChanged`,
+    /// `.lock` files are dropped).
+    FilesChanged {
+        paths: Vec<PathBuf>,
+        kind: FsEventKind,
+    },
+
+    /// A git metadata file changed (HEAD, index, refs/, FETCH_HEAD).
+    GitMetaChanged { kind: GitMetaKind },
+
+    /// VCS lock activity observed: `index.lock`/`gc.pid`/`.sl` `wlock` is
+    /// present, or an event for one arrived with the file already gone (fast
+    /// ops complete inside one debounce batch). State is in flux until the
+    /// matching `GitOperationCompleted` arrives.
+    GitOperationStarted,
+
+    /// The lock has been gone for [`crate::SETTLE_MS`]: rapid lock cycles
+    /// (rebase/squash picks) merge into one operation, so one pair is emitted
+    /// per burst, not per cycle. `head_changed` reports whether `.git/HEAD`
+    /// differs from its value when the operation's *first* lock appeared.
+    GitOperationCompleted { head_changed: bool },
+}
+
+/// Aligned with `kigi_workspace_types::FsEventKind` (identity map at
+/// the workspace boundary). `notify::EventKind::{Access, Any, Other}` are
+/// filtered upstream and never surface here.
+#[derive(
+    Debug, Clone, Copy, PartialEq, Eq, Hash, Default, serde::Serialize, serde::Deserialize,
+)]
+#[serde(rename_all = "snake_case")]
+#[non_exhaustive]
+pub enum FsEventKind {
+    Created,
+    #[default]
+    Modified,
+    Removed,
+    Renamed,
+}
+
+#[derive(
+    Debug, Clone, Copy, PartialEq, Eq, Hash, Ord, PartialOrd, serde::Serialize, serde::Deserialize,
+)]
+#[serde(rename_all = "snake_case")]
+#[non_exhaustive]
+pub enum GitMetaKind {
+    /// `.git/HEAD` (branch switch, commit, rebase step).
+    HeadChanged,
+    /// `.git/index` (`git add`, `git reset`, `git commit`).
+    IndexChanged,
+    /// `.git/refs/*` or `.git/packed-refs` (ref updates).
+    RefsChanged,
+    /// `.git/FETCH_HEAD` (fetch / pull).
+    FetchHeadChanged,
+}