Add todoObsidian tool for syncing TODOs to Obsidian

Scans codebases for TODO/FIXME/HACK/XXX comments and generates Markdown
notes in an Obsidian vault. Includes Zed editor integration that runs
on file save, plus a shell wrapper for CLI usage. Supports customizable
vault paths, project names, and output directories.

.zed/tasks.json

@@ -0,0 +1,15 @@
+[
+  {
+    "label": "Scan TODOs to Obsidian",
+    "command": "python3",
+    "args": [
+      "todoObsidian/main.py",
+      "{ZED_WORKTREE_ROOT}"
+    ],
+    "tags": ["file-save"],
+    "cwd": "{ZED_WORKTREE_ROOT}",
+    "reveal": "no",
+    "hide": "on_success",
+    "allow_concurrent_runs": false
+  }
+]