Fix Form 8-K metadata always loaded and add accession_number index

[Copilot]

filing_date, items, and report_date were only populated when cik/form/fileName were absent. In the main pipeline all three are supplied, so 8-K events were stored with empty/undefined metadata. Additionally, getEventsByAccession() queried on { cik, accession_number } with no supporting index.

Changes

• ProcessAccessionDocFormTask.ts: Unconditionally fetch the filing record to populate filing_date, items, report_date, and file_number; input-provided cik/form/fileName still take precedence via explicit guards

// Before — metadata only loaded when inputs were missing
if (!cik || !form || !fileName) {
  const filing = ...;
  filing_date = filing.filing_date;   // skipped in main pipeline
  items = filing.items;               // skipped — 8-K events stored with no item codes
  ...
}

// After — always loaded
const filing = ...;
if (!cik) cik = filing.cik;
filing_date = filing.filing_date;
items = filing.items;
...

• DefaultDI.ts / TestingDI.ts: Add ["cik", "accession_number"] index to form_8k_events storage so getEventsByAccession() is index-backed rather than a full scan

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.