feat: task graph loading (#48)

# feat: Add vite_task_graph crate for task dependency management

This PR introduces a new `vite_task_graph` crate that provides a robust implementation for building and managing task dependency graphs in monorepo workspaces. The crate handles package discovery, task resolution, and dependency tracking between tasks.

Key changes:
- Created new `vite_task_graph` crate with clean API for task graph management
- Implemented `TaskGraph` structure to represent task dependencies with proper edge types
- Added support for explicit and topological dependency types
- Migrated test fixtures from `vite_task` to `vite_task_graph` for better organization
- Added snapshot testing for task graph validation
- Renamed `get_package_graph` to `discover_package_graph` and added `load_package_graph` in workspace module

Author: branchseer

Cargo.lock

@@ -50,6 +50,7 @@ color-eyre = "0.6.5"
 compact_str = "0.9.0"
 const_format = "0.2.34"
 constcat = "0.6.1"
+copy_dir = "0.1.3"
 crossterm = { version = "0.29.0", features = ["event-stream"] }
 csv-async = { version = "1.3.1", features = ["tokio"] }
 ctor = "0.6"
@@ -70,6 +71,7 @@ fspy_test_utils = { path = "crates/fspy_test_utils" }
 futures = "0.3.31"
 futures-core = "0.3.31"
 futures-util = "0.3.31"
+insta = "1.44.3"
 itertools = "0.14.0"
 libc = "0.2.172"
 memmap2 = "0.9.7"
@@ -95,7 +97,7 @@ serde_yml = "0.0.12"
 sha2 = "0.10.9"
 shared_memory = "0.12.4"
 shell-escape = "0.1.5"
-smallvec = { version = "2.0.0-alpha.11", features = ["std"] }
+smallvec = { version = "2.0.0-alpha.12", features = ["std"] }
 stackalloc = "1.2.1"
 supports-color = "3.0.1"
 syscalls = { version = "0.6.18", default-features = false }
@@ -113,6 +115,7 @@ tree-sitter-bash = "0.23.1"
 tui-term = "0.2.0"
 twox-hash = "2.1.1"
 uuid = "1.18.1"
+vec1 = "1.12.1"
 vite_glob = { path = "crates/vite_glob" }
 vite_path = { path = "crates/vite_path" }
 vite_str = { path = "crates/vite_str" }

Cargo.toml

@@ -1,6 +1,7 @@
 use std::{
     ffi::OsStr,
     fmt::Display,
+    hash::Hash,
     ops::Deref,
     path::{Path, PathBuf},
     sync::Arc,
@@ -11,7 +12,7 @@ use ref_cast::{RefCastCustom, ref_cast_custom};
 use crate::relative::{FromPathError, InvalidPathDataError, RelativePathBuf};
 
 /// A path that is guaranteed to be absolute
-#[derive(RefCastCustom, Debug, PartialEq, Eq)]
+#[derive(RefCastCustom, Debug, PartialEq, Eq, PartialOrd, Ord)]
 #[repr(transparent)]
 pub struct AbsolutePath(Path);
 impl AsRef<Self> for AbsolutePath {
@@ -31,6 +32,12 @@ impl PartialEq<AbsolutePathBuf> for &AbsolutePath {
     }
 }
 
+impl Hash for AbsolutePath {
+    fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
+        self.0.hash(state);
+    }
+}
+
 impl AbsolutePath {
     /// Creates a [`AbsolutePath`] if the give path is absolute.
     pub fn new<P: AsRef<Path> + ?Sized>(path: &P) -> Option<&Self> {