feat(native): expose unified edit module with native ops

Adds applyEdits, applyWorkspaceEdit, replaceSymbol, insertAroundSymbol,
and watchTree to @singularity-forge/native via the new ./edit subpath.

- applyEdits / applyWorkspaceEdit: LSP-shaped TextEdit arrays applied via
  byte-level splice + atomic rename, two-phase commit across files.
- replaceSymbol / insertAroundSymbol: tree-sitter symbol resolution via
  forge-ast, TS/JS/TSX support; v1 replaces whole declaration.
- watchTree: notify-rs recursive watcher with native globset ignore + JS
  EventEmitter wrapper (drops chokidar dep).

Rust impl in rust-engine/crates/engine/src/{edit,symbol,watch}.rs.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/native/src/edit/index.ts

@@ -161,13 +161,14 @@ function normalizeWorkspaceEdit(
       edits: [...entry.edits],
     }));
   }
-  if (Array.isArray(workspaceEdit.documentChanges)) {
-    return workspaceEdit.documentChanges.map((entry) => ({
+  const edit = workspaceEdit as WorkspaceEditLike;
+  if (Array.isArray(edit.documentChanges)) {
+    return edit.documentChanges.map((entry: TextDocumentEdit) => ({
       filePath: entry.filePath,
       edits: [...entry.edits],
     }));
   }
-  return Object.entries(workspaceEdit.changes ?? {}).map(([filePath, edits]) => ({
+  return Object.entries(edit.changes ?? {}).map(([filePath, edits]) => ({
     filePath,
     edits: [...edits],
   }));