Release v0.5.6

Harden OpenRouter embedding batching and oversized inputs

Harden OpenRouter embeddings and enable larger sync batches

Add account reauth and OpenRouter embedding provider

Reset NeedsReauth status immediately on successful init

Fix NeedsReauth status not resetting after successful sync

Add Dawn token provider for unified token storage

Skip local embedding model when using remote + BM25 fallback

Add hybrid remote/local embedding support

Add auto-discovery of accounts from token store at daemon startup

Add multi-tenant user_id support for PostgreSQL token provider

Fix stale estimated_total_emails not being cleared after backfill completes

Fix PostgresTokenProvider to use table_name during initialization

Add postgres feature to CLI and daemon Cargo.toml

Use TokenProvider trait throughout codebase