Fix augurScan live event polling SQL

[KillariDev]

Summary

• rename the live-event replay CTE from the PostgreSQL keyword window to event_window
• update all references while preserving replay and reset behavior
• stop durable live-event polling from repeatedly failing with a PostgreSQL syntax error

Validation

• bun run tsc
• cd augurScan && bun test tests/postgres.integration.test.ts (9 passed; PostgreSQL-backed case skipped because POSTGRES_TEST_URL was unavailable)
• cd augurScan && bun test (171 passed; same PostgreSQL-backed case skipped)
• cd augurScan && bun run check
• bun run check:changed
• bun run knip
• git diff --check

Final review: 96/100, no findings.