test: add live Firebird event test using fbird_event_wait with actual DB trigger

[satwareAG-ironMike]

Problem

event_poller_wrapper.phpt tests the PHP userland EventPoller strategy pattern but does NOT test actual Firebird event registration/firing. No test in the entire suite calls fbird_event_wait with an actual trigger-fired event.

Acceptance Criteria

• New test file fbird_event_wait_001.phpt (requires Firebird connection)
• Test creates a stored procedure and trigger that fires a named event
• Test calls fbird_set_event_handler and fbird_event_wait
• Verifies the event is received within timeout
• Has proper --SKIPIF-- (Firebird 3.0+) and --CLEAN-- (drops SP, trigger, table)

Source

QA Audit 2026-04-09 - Finding T4 (Priority P3)