Adds a basic IndexedDB API implementation covering: - Database lifecycle: open, close, deleteDatabase, version upgrades with upgradeneeded events - Object stores: put, get, delete, clear, count, getAll with keyPath and autoIncrement support - Transactions: readonly/readwrite mode enforcement, auto-commit with complete event, abort - Indexes: createIndex with unique constraint, index.get for querying by non-primary key - Structured clone: JS Value <-> IdbValue conversion for storing objects, arrays, primitives - File-based persistence: origin-partitioned storage in ~/.we/indexeddb/ with binary serialization - Event-driven API: deferred event firing via VM event loop (onsuccess, onerror, onupgradeneeded, oncomplete, onabort) - Integration: DomBridge field, VM event loop drain, GC roots for pending events Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>