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-shell/src/util/hooks.rs

@@ -0,0 +1,117 @@
+//! Shared hook source path discovery.
+
+use std::path::{Path, PathBuf};
+
+use kigi_hooks::discovery::HookSource;
+
+/// Owned paths for hook sources. Callers borrow via `as_sources()`.
+pub struct HookSourcePaths {
+    pub global: Vec<PathBuf>,
+    pub project: Vec<PathBuf>,
+}
+
+impl HookSourcePaths {
+    /// Borrow as `HookSource` refs. Project sources are excluded when untrusted.
+    pub fn as_sources(&self, include_project: bool) -> (Vec<HookSource<'_>>, Vec<HookSource<'_>>) {
+        let global = self.global.iter().map(|p| path_to_source(p)).collect();
+        let project = if include_project {
+            self.project.iter().map(|p| path_to_source(p)).collect()
+        } else {
+            vec![]
+        };
+        (global, project)
+    }
+}
+
+fn path_to_source(p: &Path) -> HookSource<'_> {
+    if p.is_dir() {
+        HookSource::Directory(p)
+    } else {
+        HookSource::SettingsFile(p)
+    }
+}
+
+/// Build hook source paths for global (`~/`) and project (`<git_root>/`) scopes.
+/// Callers gate project sources on trust via `as_sources(trusted)`.
+pub fn discover_hook_source_paths(
+    git_root: Option<&Path>,
+    compat: &kigi_tools::types::compat::CompatConfig,
+) -> HookSourcePaths {
+    // Compat gate: skip .claude hook sources when disabled.
+    let skip_claude_compat = !compat.claude.hooks;
+    // Phase 2 cutoff: if the user has imported, skip .claude/settings.json
+    // sources. Native .kigi/hooks/ directories are still scanned (they hold
+    // any hooks that were imported by /import-claude).
+    let skip_claude = skip_claude_compat
+        || crate::claude_import::is_claude_import_marked_with_log("discover_hook_source_paths");
+
+    // Compat gate: skip Cursor hook sources when disabled.
+    let skip_cursor = !compat.cursor.hooks;
+
+    let home = dirs::home_dir();
+    // user_kigi_home() is None when no home resolves, so inspect lists the same
+    // sources a live session loads, instead of a cwd-relative .kigi.
+    let grok = kigi_config::user_kigi_home();
+    let mut global = Vec::new();
+
+    if !skip_claude && let Some(ref h) = home {
+        global.push(h.join(".claude").join("settings.json"));
+        global.push(h.join(".claude").join("settings.local.json"));
+    }
+    if let Some(ref grok) = grok {
+        global.push(grok.join("hooks"));
+    }
+
+    let custom_paths: Vec<PathBuf> = grok
+        .as_ref()
+        .and_then(|g| std::fs::read_to_string(g.join("hooks-paths")).ok())
+        .map(|content| {
+            content
+                .lines()
+                .filter(|l| !l.trim().is_empty())
+                .map(|l| PathBuf::from(l.trim()))
+                .collect()
+        })
+        .unwrap_or_default();
+    global.extend(custom_paths);
+
+    if let Some(ref h) = home
+        && !skip_cursor
+    {
+        global.push(h.join(".cursor").join("hooks.json"));
+    }
+
+    let mut project = Vec::new();
+
+    if let Some(root) = git_root {
+        if !skip_claude {
+            project.push(root.join(".claude").join("settings.json"));
+            project.push(root.join(".claude").join("settings.local.json"));
+        }
+        project.push(root.join(".kigi").join("hooks"));
+        if !skip_cursor {
+            project.push(root.join(".cursor").join("hooks.json"));
+        }
+    }
+
+    HookSourcePaths { global, project }
+}
+
+/// Single load entry point: build compat-aware sources, gate project sources on
+/// trust, then load. Every session-startup and mid-session reload site routes
+/// through here so the source policy stays in one place. `discover_hook_source_paths`
+/// and `HookSourcePaths::as_sources` stay public for the `inspect` path (which
+/// enumerates sources with all vendors on) and the unit tests that assert on the
+/// raw source lists.
+pub fn discover_hooks(
+    git_root: Option<&Path>,
+    compat: &kigi_tools::types::compat::CompatConfig,
+    trusted: bool,
+) -> (
+    kigi_hooks::discovery::HookRegistry,
+    Vec<kigi_hooks::error::HookError>,
+) {
+    let source_paths = discover_hook_source_paths(git_root, compat);
+    let (global_sources, project_sources) = source_paths.as_sources(trusted);
+    kigi_hooks::discovery::load_hooks_from_sources(&global_sources, &project_sources)
+}