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-fast-worktree/src/copy/skip.rs

@@ -0,0 +1,112 @@
+//! Skip logic for copy operations (gitignore + additional patterns).
+
+use std::path::{Path, PathBuf};
+use std::sync::Arc;
+
+use anyhow::Result;
+use dashmap::DashSet;
+use ignore::{WalkBuilder, WalkState};
+
+/// Build a globset matcher for skip patterns.
+pub(crate) fn build_skip_matcher(patterns: &[String]) -> Result<globset::GlobSet> {
+    let mut builder = globset::GlobSetBuilder::new();
+    for pattern in patterns {
+        builder.add(globset::Glob::new(pattern)?);
+    }
+    Ok(builder.build()?)
+}
+
+/// Collect all *unignored* paths in `source` (relative).
+///
+/// This is used to implement an "ignored-only" copy: by collecting unignored paths
+/// and then skipping them during a second pass with `respect_gitignore=false`.
+pub(crate) fn collect_unignored_paths(
+    source: &Path,
+    parallelism: usize,
+) -> Result<DashSet<PathBuf>> {
+    let unignored: Arc<DashSet<PathBuf>> = Arc::new(DashSet::new());
+
+    // git_exclude/git_global off: external tools append broad patterns (e.g.
+    // *.zip) to `.git/info/exclude`; the `ignore` crate would then drop matching
+    // TRACKED files from the unignored set, so the ignored-copy clobbers them.
+    let walker = WalkBuilder::new(source)
+        .hidden(false)
+        .git_ignore(true)
+        .git_global(false)
+        .git_exclude(false)
+        .filter_entry(|entry| entry.file_name() != ".git")
+        .threads(parallelism)
+        .build_parallel();
+
+    walker.run(|| {
+        let unignored = Arc::clone(&unignored);
+        Box::new(move |entry_result| {
+            let entry = match entry_result {
+                Ok(e) => e,
+                Err(_) => return WalkState::Continue,
+            };
+
+            let rel_path = match entry.path().strip_prefix(source) {
+                Ok(p) => p.to_path_buf(),
+                Err(_) => return WalkState::Continue,
+            };
+
+            unignored.insert(rel_path);
+            WalkState::Continue
+        })
+    });
+
+    Ok(match Arc::try_unwrap(unignored) {
+        Ok(set) => set,
+        Err(arc) => {
+            let mut set = DashSet::new();
+            set.extend(arc.iter().map(|p| p.clone()));
+            set
+        }
+    })
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use kigi_test_utils::git::{git_commit_all, init_git_repo};
+    use tempfile::TempDir;
+
+    #[test]
+    fn collect_unignored_includes_tracked_file_matching_git_exclude() {
+        kigi_test_utils::require_git!();
+        // A tracked file matching `.git/info/exclude` must stay "unignored" so
+        // the ignored-copy doesn't re-copy and clobber it.
+        let temp = TempDir::new().unwrap();
+        let repo = temp.path();
+        init_git_repo(repo);
+
+        std::fs::write(repo.join("data.zip"), "tracked-archive").unwrap();
+        std::fs::write(repo.join("main.rs"), "fn main() {}").unwrap();
+        std::fs::write(repo.join(".gitignore"), "build/\n").unwrap();
+        git_commit_all(repo, "initial");
+
+        // External tooling appends broad patterns here (e.g., *.min.js, *.zip).
+        // `git init` does not always create `.git/info/` (the hermetic git on
+        // arm64 CI ships no init template), so create it before writing.
+        let info_dir = repo.join(".git").join("info");
+        std::fs::create_dir_all(&info_dir).unwrap();
+        std::fs::write(info_dir.join("exclude"), "*.zip\n").unwrap();
+
+        // A truly-ignored (gitignored, untracked) artifact.
+        std::fs::create_dir(repo.join("build")).unwrap();
+        std::fs::write(repo.join("build/out.o"), "obj").unwrap();
+
+        let unignored = collect_unignored_paths(repo, 1).unwrap();
+
+        assert!(
+            unignored.contains(&PathBuf::from("data.zip")),
+            "tracked file matching .git/info/exclude must be classed unignored"
+        );
+        assert!(unignored.contains(&PathBuf::from("main.rs")));
+        assert!(
+            !unignored.contains(&PathBuf::from("build/out.o")),
+            "a real .gitignore'd file must remain ignored (not unignored)"
+        );
+    }
+}