Book RAG Push — Phase 04b: Chunks → 3 Vector Stores

Purpose

Take the canonical <book-dir>/.ingest/chunks.jsonl produced by /book-chunk and fan it out to four destinations:

1. pgvector (book_chunks table in Supabase) — primary, with HNSW cosine index.
2. OpenAI Vector Stores — accessed via file_search tool in Responses API.
3. Gemini File Search — accessed via fileSearch tool in generateContent.
4. Anthropic Files API — accessed via document blocks with citations + memory tool for agentic sessions.

Each chunk's sha256 is the source of truth for "has this chunk changed". We only re-upload what's new or modified.

Invocation

$ARGUMENTS: