feat: add Punishing: Gray Raven with karendar.com source
Add karendar.com as the event source for Punishing: Gray Raven (PGR). Karendar publishes a dedicated Global event calendar with exact UTC timestamps in clean server-rendered HTML. - Register 'pgr' in GameId and GAMES registry (#CC292B, Kuro Games). - Add parseWeekdayDayMonthYearUtc in src/ingest/dates.ts with unit tests. - Implement karendarParser in src/ingest/parsers/karendar.ts reading 'week', 'ongoing', and 'upcoming' sections, mapping indefinite/permanent ends to endsAt: null, and categorizing tags to EventType. - Register pgr-karendar-events in src/ingest/adapters/index.ts. - Add pinned fixture, expected output, and comprehensive test suites. - Update documentation in AGENTS.md, README.md, docs/INGESTION.md, and docs/SOURCES.md.
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