test(flood): add test for custom pulsetime parameter

[TimeToBuildBob]

Follows up on #142 (which added the pulsetime param to q2_flood) by adding a test that verifies flood() respects the custom pulsetime value.

The test covers:

• Default pulsetime=5: a 30s gap is not flooded (gap > pulsetime)
• Custom pulsetime=31: a 30s gap is flooded (gap ≤ pulsetime)

Originally part of #135; the code change landed in #142 but the test wasn't included.

[greptile-apps]

Greptile Summary

This PR adds coverage for the custom pulsetime argument in flood().

• Confirms the default pulse time leaves a 30-second gap unchanged.
• Confirms a custom 31-second pulse time fills the same gap.

Confidence Score: 5/5

This looks safe to merge.

• No blocking issues found in the changed code.
• Reusing the input events is safe because each call deep-copies them before processing.

Important Files Changed

Filename	Overview
tests/test_flood.py	Adds a focused test for default and custom pulse-time behavior with expectations that match the implementation.

_{Reviews (1): Last reviewed commit: "test(flood): add test for custom pulseti..." | Re-trigger Greptile}

[TimeToBuildBob]

CI-green and mergeable — waiting only on a maintainer click.

This PR is ready to merge, but the bot has pull-only access to this repo and can't self-merge — surfacing it here so it isn't lost. The monitoring loop will stop re-flagging it now that this note is posted.