Bug: Year and court not extracted from parentheticals on full case citations

[medelman17]

Description

Full case citations return year: undefined and court: undefined (or "N/A") even when the year and court are clearly present in a trailing parenthetical. The extraction captures volume, reporter, and page correctly but doesn't parse the (Court Year) parenthetical that follows.

Reproduction

import { extractCitations } from 'eyecite-ts'

const text = 'See Texas v. Johnson, 491 U.S. 397, 404 (1989).'
const citations = extractCitations(text)

console.log(citations[0])
// {
//   type: 'case',
//   volume: 491,
//   reporter: 'U.S.',
//   page: 397,
//   year: undefined,    // Expected: 1989
//   court: undefined,   // Expected: 'scotus' (inferred from U.S. Reports)
// }

Additional failing examples from SCOTUS text:

Input	Expected Year	Actual Year	Expected Court	Actual Court
491 U.S. 397, 404 (1989)	1989	undefined	scotus	undefined
418 U.S. 405, 409 (1974)	1974	undefined	scotus	undefined
468 U.S. 288, 294 (1984)	1984	undefined	scotus	undefined
391 U.S. 367, 376 (1968)	1968	undefined	scotus	undefined

Context

The Python eyecite library extracts year and court from the trailing parenthetical as core metadata on FullCaseCitation objects. This is critical for:

1. Disambiguation — when the same volume/reporter/page appears in multiple series, the year helps identify the correct case
2. 2. Temporal analysis — citation network analysis depends on knowing when cited cases were decided
3. 3. Reporter validation — the year can be cross-referenced against reporter date ranges to validate citation accuracy
4. 4. Court hierarchy — knowing the citing court matters for precedential weight analysis

Related Issues

• Feature: Court detection fails when parenthetical contains month/day #5 (Court detection fails when parenthetical contains month/day) — related but that issue is about edge cases in court detection; this issue is about year/court not being extracted at all in the standard (Court Year) format
• • Feature: Full citation span including plaintiff and parenthetical #9 (Full citation span including plaintiff and parenthetical) — expanding the span would help, but the metadata should be extracted regardless of span size

Expected Behavior

The parenthetical following a case citation should be parsed for:

• Year: 4-digit number, typically at the end: (1989), (9th Cir. 2020)
• • Court: Court abbreviation before the year: (9th Cir. 2020), (D. Mass. 2019), (S.D.N.Y. 2021)
• • • For Supreme Court reporters (U.S., S. Ct., L. Ed.), court should be inferred as scotus even when not explicitly stated in the parenthetical