List available SEC filings for one company and fiscal year (rows, ids, fact counts, and an amendment note on filings that absorbed an amendment). Use this first when you need filing_id or to see which quarters/forms exist before calling get_filing_facts, query_line_items, get_filing_statement, compare_line_items, compare_facts, or get_filing_excel. Arguments: ticker, fiscal_year; optional form_type, quarter. form_type accepts US forms (10-K, 10-Q) and foreign-issuer annual forms (20-F for US-listed foreign companies, 40-F for Canadian filers); Korean (DART) filings use 10-K (annual) / 10-Q (quarterly). Results may be truncated by your plan's history window or coverage scope — check `_warnings`. Companies outside your plan's coverage scope return 403 PLAN_TIER_INSUFFICIENT_COVERAGE. Same behavior and credits as POST /api/v1/data/filings; field details in FINANCIAL_API_DOCUMENTATION.md.