chore: untrack AGENTS.md (AI working memory, not source code)

.claude/AGENTS.md

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-# hijri-core — PRI (Per-Repo Instructions)
-
-**PPI:** `~/Sites/acamarata/.claude/CLAUDE.md`
-
-## What This Is
-
-Core Hijri calendar engine for JavaScript/TypeScript. Provides Hijri/Gregorian date conversion with a pluggable calendar registry supporting multiple calculation methods.
-
-**npm:** `hijri-core@1.0.0`
-**Language:** TypeScript
-**License:** MIT
-
-## Key Technical Details
-
-- Zero runtime dependencies
-- Pluggable engine architecture: UAQ (Umm al-Qura, 1318-1500 AH) and FCNA engines built in
-- Foundation package: used by luxon-hijri, date-fns-hijri, dayjs-hijri-plus, moment-hijri-plus, temporal-hijri
-- Dart counterpart: hijri-core-dart (hijri_core@1.0.0 on pub.dev)
-
-## API Surface
-
-- `toHijri(gregorianDate, engine?)` — Gregorian to Hijri
-- `toGregorian(hijriYear, hijriMonth, hijriDay, engine?)` — Hijri to Gregorian
-- `registerCalendar(name, engine)` — add custom calendar engine
-- `getCalendar(name)` — retrieve registered engine
-- `isValidHijriDate(year, month, day, engine?)` — validation
-- `daysInHijriMonth(year, month, engine?)` — month length
-- Month name arrays: long/medium/short (Arabic + English)
-- Weekday name arrays
-
-## Important Notes
-
-- This is a FOUNDATION package. Breaking changes here affect 5 downstream plugin packages.
-- When making API changes: update all 5 plugin packages (luxon-hijri, date-fns-hijri, dayjs-hijri-plus, moment-hijri-plus, temporal-hijri) and bump their versions too.
-- Test all 5 plugins against any hijri-core change before publishing.
-
-## Commands
-
-- `pnpm test` — run test.mjs + test-cjs.cjs
-- `pnpm run typecheck` — tsc --noEmit
-- `pnpm build` — tsup build