Merge origin/main into delphi-support

Integrate main branch changes (WASM grammar architecture, centralized
resolution caches, SQLite adapter) with delphi-support branch. Pascal
grammar is now built as WASM and shipped in src/extraction/wasm/ for
consistency with the WASM-based grammar loading approach.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/types.ts

@@ -577,6 +577,8 @@ export const DEFAULT_CONFIG: CodeGraphConfig = {
     '**/__pycache__/**',
     '**/.venv/**',
     '**/venv/**',
+    '**/site-packages/**',
+    '**/dist-packages/**',
     '**/.pytest_cache/**',
     '**/.mypy_cache/**',
     '**/.ruff_cache/**',