feat(derive): Holocene Buffer Flushing

[refcell]

Description

Small PR to add buffer flushing to the batch stream.

[refcell]

• feat(derive): Channel Flushing #576
• feat(derive): Holocene Buffer Flushing #575 👈
• feat(derive): BatchStream Stage Wiring #567
• feat(derive): New BatchStream Stage for Holocene #566
• main

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[codecov]

Codecov Report

Attention: Patch coverage is 9.09091% with 10 lines in your changes missing coverage. Please review.

Project coverage is 78.4%. Comparing base (a610b16) to head (a222220).
Report is 5 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
crates/derive/src/stages/batch_stream.rs	0.0%	5 Missing ⚠️
crates/derive/src/pipeline/builder.rs	0.0%	2 Missing ⚠️
crates/derive/src/stages/channel_reader.rs	0.0%	2 Missing ⚠️
crates/derive/src/stages/batch_queue.rs	50.0%	1 Missing ⚠️

Additional details and impacted files

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