feat: add VS Code configuration for debugging bun

- Add .vscode/extensions.json recommending oven.bun-vscode.
- Add .vscode/launch.json with Bun debug configurations for various scripts.
- Add .vscode/settings.json for TypeScript SDK, debug options, and file exclusions.
- Remove .vscode/ entry from .gitignore.
- Refactor ingest.ts: increase chunk size to 8192 and overlap to 200, raise large document threshold, remove <h1>/<h2> separators, skip sections containing only headings or minimal content, and add warnings for very small chunks.

.vscode/settings.json

@@ -0,0 +1,19 @@
+{
+  "typescript.tsdk": "./node_modules/typescript/lib",
+  "typescript.enablePromptUseWorkspaceTsdk": true,
+  "debug.javascript.autoAttachFilter": "smart",
+  "debug.javascript.terminalOptions": {
+    "skipFiles": ["<node_internals>/**"]
+  },
+  "search.exclude": {
+    "**/node_modules": true,
+    "**/dist": true,
+    "**/storage": true,
+    "**/spec-built": true,
+    "**/engine262": true
+  },
+  "files.exclude": {
+    "**/node_modules": true,
+    "**/dist": true
+  }
+}