Update vscode-rojo submodule reference and complete migration plan for path encoding

- Updated the vscode-rojo submodule to the latest commit.
- Marked all phases of the path encoding migration plan as completed, transitioning to a slugify and deduplication approach.
- Updated documentation to reflect changes in filename handling and metadata management.

.cursor/rules/rojo-syncback.mdc

@@ -210,10 +210,12 @@ snapshot.with_new_path(path, new_ref, old_ref)
 ```
 
 **Filename generation** (`file_names.rs`):
-- Uses instance name
+- Slugifies instance name (`slugify_name()`: forbidden chars → `_`)
+- Deduplicates against taken names (`deduplicate_name()`: appends `~1`, `~2`, etc.)
 - Adds appropriate extension based on middleware
-- Encodes Windows-invalid chars if enabled
+- Stores real name in `.meta.json5` `name` field when slug differs
 - Example: `Script` named "My Script" → `My Script.server.luau`
+- Example: `Script` named "Hey/Bro" → `Hey_Bro.server.luau` + meta with `name: "Hey/Bro"`
 
 ### Property Filtering
 
@@ -378,7 +380,7 @@ Filesystem:
    - Solution: Use clean mode
    
 2. **Invalid filename** - Instance name contains invalid chars
-   - Solution: Enable `decodeWindowsInvalidChars` or rename in Studio
+   - Solution: Handled automatically by `slugify_name()` + metadata `name` field
    
 3. **Ref to pruned instance** - Property points to instance not in project
    - Logged as warning, property not synced

.cursor/rules/rojo.mdc

@@ -185,10 +185,11 @@ fn do_something() -> Result<()> {
 pub struct InstanceContext {
     pub path_ignore_rules: Arc<Vec<PathIgnoreRule>>,
     pub sync_rules: Vec<SyncRule>,
-    pub decode_windows_invalid_chars: bool,
 }
 ```
 
+**Filename handling:** Instance names with forbidden filesystem chars are slugified (forbidden chars → `_`), deduplicated (`~1`, `~2`, etc. on collision), and the real name is stored in `.meta.json5`/`.model.json5` `name` fields. See `src/syncback/file_names.rs`.
+
 **VFS passed separately to snapshot functions:**
 ```rust
 snapshot_from_vfs(&context, &vfs, &path)?

.cursor/rules/src.mdc

@@ -68,10 +68,16 @@ Transforms files → `InstanceSnapshot`. Main entry: `snapshot_from_vfs()`
 pub struct InstanceContext {
     pub path_ignore_rules: Arc<Vec<PathIgnoreRule>>,
     pub sync_rules: Vec<SyncRule>,
-    pub decode_windows_invalid_chars: bool,  // Default: true
 }
 ```
 
+**Filename handling (syncback/two-way sync):**
+
+Instance names with forbidden filesystem chars (`<>:"/\|?*`) are handled by:
+1. `slugify_name()` -- replaces forbidden chars with `_` (pure, stateless)
+2. `deduplicate_name()` -- appends `~1`, `~2`, etc. on collision (stateful)
+3. Metadata `name` field -- stores the real instance name in `.meta.json5`/`.model.json5` when the slug differs
+
 ### 3. Commands (`src/cli/`)
 
 - `serve.rs` - Live sync with WebSocket