Description

Add POST /v1/batch/analyze for multi-ticker analysis.

Tasks

• Implement batch endpoint per spec
• Add fan-out logic for multiple tickers
• Track batch job status
• Aggregate results
• Support shared parameters
• Return batch_id

Documentation

• See docs/02-api-specification.md Section 2.2 for batch spec

Acceptance Criteria

• Can analyze multiple tickers in one request
• Returns 202 with batch_id
• Status endpoint shows per-ticker progress