feat: add support for optional pulsetime param to flood in query2

[ErikBjare]

I had this in a dirty working tree, can't remember why I added it. But kinda makes sense?

[greptile-apps]

Greptile Summary

This PR adds an optional pulsetime: float = 5 parameter to q2_flood in the query2 interface, forwarding it to aw_transform.flood(). The default matches flood()'s own default so existing queries are unaffected. A new test validates the underlying flood() function with a custom pulsetime value.

• q2_flood now accepts pulsetime: float = 5 and passes it through to flood(), enabling callers to override the gap-fill threshold.
• A new test verifies that a 30s gap is not flooded at the default pulsetime=5 but is flooded when pulsetime=31.

Confidence Score: 4/5

Safe to merge; the wrapper change is minimal and backwards-compatible, with the only gap being that the query2 decorator chain is untested with the new parameter.

The wrapper change is a one-liner with a default that preserves existing behaviour, and the underlying flood() already supported pulsetime. The new test validates the right outcome but exercises only the raw flood() function — the q2_function/q2_typecheck decorator chain that manipulates positional args is not covered, leaving a small blind spot.

tests/test_flood.py — consider adding a test that calls q2_flood through the query2 layer to confirm pulsetime survives the decorator chain.

Important Files Changed

Filename	Overview
aw_query/functions.py	Adds optional pulsetime: float = 5 param to q2_flood, forwarding it to the underlying flood() call; default matches flood()'s own default, so existing behaviour is unchanged.
tests/test_flood.py	Adds test_flood_with_custom_pulsetime covering the underlying flood() function; the query2 wrapper (q2_flood) is not exercised with the new parameter.

Sequence Diagram

sequenceDiagram
    participant Query as query2 engine
    participant q2_flood
    participant flood as aw_transform.flood()

    Query->>q2_flood: "flood(events, pulsetime=31)"
    Note over q2_flood: q2_function strips datastore/namespace args
    Note over q2_flood: q2_typecheck validates required args only
    q2_flood->>flood: "flood(events, pulsetime=31)"
    flood-->>q2_flood: "List[Event] (gaps <= 31s filled)"
    q2_flood-->>Query: List[Event]

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[greptile-apps]

Test covers flood() directly, not q2_flood through the query2 layer

The new test validates the underlying flood() function with pulsetime, but it doesn't verify that the parameter is correctly forwarded through the q2_flood wrapper and its decorator chain (q2_function + q2_typecheck). Since q2_function manipulates *args by stripping datastore/namespace arguments positionally, a positional-index shift bug in the decorator could cause pulsetime to be silently ignored without this test catching it. There are no existing q2_flood tests in test_query2.py to compensate.