Summary

This PR fixes two small but impactful bugs:

Bug 1 — Missing format argument in logger.warning (set_title_callback_processor.py)

The log call has two %s placeholders but only passes one argument (exc), which causes a TypeError at runtime whenever the except branch is hit:

# Before (broken)
_logger.warning(
    'Title poll failed for conversation %s: %s',
    exc,
)

# After (fixed) — supply `url` as the first positional arg
_logger.warning(
    'Title poll failed for conversation %s: %s',
    url,
    exc,
)

Bug 2 — -0 slice returns full list instead of empty (recent_events_condenser.py)

When keep_first >= max_events, tail_length becomes 0. In Python view[-0:] is equivalent to view[0:], which returns the entire list rather than an empty list. This silently defeats the max_events cap:

# Before (broken)
tail = view[-tail_length:]

# After (fixed)
tail = view[-tail_length:] if tail_length > 0 else []

Test plan

• Verified the logger call now matches the number of format placeholders
• Verified that RecentEventsCondenser with keep_first >= max_events returns only head (empty tail)
• Existing tests continue to pass