The April 2026 IDX ownership PDF omits the zero-valued scrip column for
some holders, causing the parser to leave holdings_scripless/scrip as
empty strings. This broke normalize_ksei_row which called parse_id_number
on empty input.
Two-layer fix:
- Parser: pop_numeric_tail handles 2-column (missing scrip) rows by
defaulting scrip to "0"
- Normalizer: parse_id_number_or_zero backstop treats empty component
share fields as 0 while still requiring total_shares
Also includes AGENTS.md refresh, formatting cleanup (rustfmt), and
version bump to 0.2.2.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>