Publish harness and TUI open-source

initial sync from the monorepo

crates/codegen/xai-fast-worktree/src/lib.rs

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+//! High-performance git worktree creation using CoW cloning.
+//!
+//! This crate provides fast worktree creation by:
+//! 1. Using `git worktree add --no-checkout` (instant metadata creation)
+//! 2. Parallel CoW file cloning with hash-based sharding
+//! 3. Optional dirty file replication and ignored file copying
+//! 4. BTRFS snapshot support on Linux for O(1) cloning
+//! 5. Worktree sync API for pre-created worktree pools
+//! 6. SQLite metadata tracking (behind `metadata` feature)
+
+mod api;
+#[cfg(target_os = "linux")]
+pub mod btrfs;
+mod copy;
+#[cfg(feature = "metadata")]
+pub mod db;
+#[cfg(feature = "metadata")]
+pub mod discovery;
+mod git;
+#[cfg(target_os = "linux")]
+pub(crate) mod mount_info;
+#[cfg(target_os = "linux")]
+mod overlay;
+pub mod sync;
+#[cfg(target_os = "linux")]
+pub(crate) mod util;
+mod worktree;
+
+#[cfg(target_os = "linux")]
+pub use api::cleanup_orphaned_btrfs_snapshots;
+#[cfg(target_os = "linux")]
+pub use api::cleanup_orphaned_overlay_snapshots;
+#[cfg(feature = "metadata")]
+pub use api::gc::{GcOptions, GcReport, gc_worktrees, gc_worktrees_with_delegate};
+pub use api::{
+    BtrfsDelegate, BtrfsMode, CleanupReport, CopyReport, CreationMode, DelegateSnapshotResult,
+    DirtyFilesReport, ENOSPC_OS_MESSAGE, IgnoredFilesMode, OUT_OF_DISK_CONTEXT, RemoveReport,
+    WorkingTreeMode, WorktreeBuilder, WorktreeReport, cleanup_worktrees_in,
+    cleanup_worktrees_in_with_delegate, remove_worktree, remove_worktree_with_delegate,
+};
+#[cfg(feature = "metadata")]
+pub use db::{
+    DbStats, ListFilter, WorktreeDb, WorktreeKind, WorktreeRecord, WorktreeStatus, id_from_path,
+    now_epoch_secs, repo_name_from_path, resolve_grok_home,
+};
+#[cfg(feature = "metadata")]
+pub use discovery::{RebuildReport, discover_worktrees, rebuild_worktree_db};
+pub use git::checkout::{
+    rehydrate_worktree_from_ref, snapshot_worktree_to_ref, transfer_snapshot_to_repo,
+};
+pub use sync::{SourceDirtyState, SyncReport, WorktreeSync, collect_source_dirty_state};
+#[cfg(target_os = "linux")]
+pub use worktree::execute::cleanup_snapshot_git_state;
+
+/// Count the number of tracked files in a git repository's index.
+///
+/// Reads the index header via `gix`, which contains the entry count — this
+/// is an O(1) read (no directory walk). Useful for deciding whether a repo
+/// is large enough to benefit from worktree pooling.
+pub fn count_tracked_files(repo_path: &std::path::Path) -> anyhow::Result<usize> {
+    let repo = gix::discover(repo_path)
+        .map_err(|e| anyhow::anyhow!("failed to discover git repo: {e}"))?;
+    let index = repo
+        .index_or_load_from_head()
+        .map_err(|e| anyhow::anyhow!("failed to load git index: {e}"))?;
+    Ok(index.entries().len())
+}