Enhance documentation and update syncback features

- Updated the `audit.md` documentation to clarify the syncback process and the structure of the `FsSnapshot`.
- Revised the `atlas-api.mdc` to reflect changes in the Git metadata handling, including the introduction of a separate endpoint for fetching Git metadata.
- Improved the `atlas-dedup.mdc` to include handling for the reserved name "init" during slugification.
- Enhanced the `atlas-syncback.mdc` to document the new `SyncbackResult` structure and its integration with the syncback process.
- Updated various sections across multiple documentation files to ensure consistency and clarity regarding the project's architecture and API endpoints.

These changes aim to improve the overall understanding of the system and its components, facilitating better usage and integration.

.cursor/rules/atlas-dedup.mdc

@@ -71,7 +71,11 @@ Pure, stateless. Replaces forbidden filesystem characters with `_`.
 const FORBIDDEN_CHARS: [char; 9] = ['<', '>', ':', '"', '/', '|', '?', '*', '\\'];
 const SLUGIFY_CHARS: [char; 10] = ['<', '>', ':', '"', '/', '|', '?', '*', '\\', '~'];
 const DANGEROUS_SUFFIXES: [&str; 8] = [".server", ".client", ".plugin", ".local", ".legacy", ".meta", ".model", ".project"];
-const INVALID_WINDOWS_NAMES: [&str; 22] = ["CON", "PRN", "AUX", "NUL", "COM1".."COM9", "LPT1".."LPT9"];
+const INVALID_WINDOWS_NAMES: [&str; 22] = [
+    "CON", "PRN", "AUX", "NUL",
+    "COM1", "COM2", "COM3", "COM4", "COM5", "COM6", "COM7", "COM8", "COM9",
+    "LPT1", "LPT2", "LPT3", "LPT4", "LPT5", "LPT6", "LPT7", "LPT8", "LPT9",
+];
 ```
 
 **Behavior:**
@@ -79,12 +83,13 @@ const INVALID_WINDOWS_NAMES: [&str; 22] = ["CON", "PRN", "AUX", "NUL", "COM1".."
 - Strips leading/trailing spaces and dots
 - Neutralizes Windows reserved names (`CON` → `CON_`)
 - Neutralizes dangerous suffixes (`.server` etc.) that would be misinterpreted as middleware extensions
+- Neutralizes reserved name `"init"` (case-insensitive) → `"init_"` to avoid collision with init file convention
 
 **Key invariant:** `slugify_name` is idempotent. Applying it twice produces the same result.
 
 ### name_needs_slugify
 
-Returns `true` if the name requires slugification. Checks for: `SLUGIFY_CHARS`, control characters, leading/trailing spaces, trailing dots, dangerous suffixes (`.server` etc.), Windows reserved names (`CON` etc.), and empty string. Used to decide whether metadata `name` field is needed.
+Returns `true` if the name requires slugification. Checks for: `SLUGIFY_CHARS`, control characters, leading/trailing spaces, trailing dots, dangerous suffixes (`.server` etc.), Windows reserved names (`CON` etc.), reserved name `"init"` (case-insensitive), and empty string. Used to decide whether metadata `name` field is needed.
 
 ### deduplicate_name_with_ext
 
@@ -193,6 +198,7 @@ pub fn match_children(
     new_dom: &WeakDom, old_dom: &WeakDom,
     new_hashes: Option<&HashMap<Ref, Hash>>,
     old_hashes: Option<&HashMap<Ref, Hash>>,
+    session: &MatchingSession,
 ) -> MatchResult
 ```
 
@@ -202,16 +208,21 @@ pub fn match_forward(
     snapshot_children: Vec<InstanceSnapshot>,
     tree_children: &[Ref],
     tree: &RojoTree,
+    session: &MatchingSession,
 ) -> ForwardMatchResult
 ```
 
 **Lua plugin:**
 ```lua
 function Matching.matchChildren(
-    virtualChildren: { string },      -- array of virtual instance IDs
-    studioChildren: { Instance },      -- array of Studio Instance objects
-    virtualInstances: { [string]: any } -- map of virtual ID → virtual instance data
-) -> { matched, unmatchedVirtual, unmatchedStudio }
+    session: MatchingSession,
+    virtualChildren: { string },
+    studioChildren: { Instance },
+    virtualInstances: VirtualInstances,
+    parentVirtualId: string?,
+    parentStudioInstance: Instance?,
+    _depth: number?
+) -> MatchResult
 ```
 
 ### Algorithm (All Three Implementations)