fix(derive): Pipeline Iterator

[refcell]

Description

Binds the Pipeline trait to be an Iterator<Item = L2AttributesWithParent>.

This replaces the custom next() method definition with the core::iter::Iterator trait that allows for greater fluency.

[refcell]

• fix(examples): Reset Failed Payload Derivation Metric #338
• feat(derive): Frame Count -> Channels Histogram #337
• fix(derive): Pipeline Iterator #334 👈
• feat(derive): Track Current Channel Size #331
• fix(derive): Prefix Metric Names #330
• fix(examples): Graceful Payload Validation #327
• feat(derive): Additional Stage Metrics #326
• feat(derive): Granular Provider Metrics #325
• main

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 77.6%. Comparing base (c87fe1d) to head (f89e215).

Files	Patch %	Lines
crates/derive/src/pipeline/core.rs	0.0%	3 Missing ⚠️

Additional details and impacted files

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