Adding "new metadata" skill

[stankiewicz]

First take on adding skills.

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Summary of Changes

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This pull request introduces a new, detailed skill guide designed to assist developers in correctly integrating and propagating new metadata fields within Apache Beam's WindowedValue structure. The guide systematically covers all necessary modifications across the Beam ecosystem, from proto definitions to runner-specific implementations and user-facing APIs, ensuring that metadata integrity is maintained throughout complex data processing workflows.

Highlights

• New Skill Guide Added: A new skill guide titled 'adding-new-metadata' has been introduced, providing comprehensive instructions for developers.
• Metadata Propagation Guidance: The guide details the process of adding and correctly propagating new metadata fields within Apache Beam's WindowedValue across various system components.
• Key Integration Points Covered: Instructions include updating proto models, WindowedValue interfaces and implementations, Dataflow's Windmill persistence, core runner components (DoFn runners, grouping, SDFs, timers), and exposing metadata to user DoFn signatures.
• Preventing Metadata Loss: The primary objective of the guide is to ensure that new metadata fields are correctly handled throughout the pipeline execution to prevent silent data loss.

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Changelog

• .agent/skills/adding-new-metadata/SKILL.md
  • Added a new skill guide providing comprehensive instructions on how to add and propagate new metadata fields in Apache Beam's WindowedValue.

Activity

• The pull request description includes standard contribution guidelines and CI status badges, but no specific human activity such as comments or reviews was provided in the context.

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R: @kennknowles added as fallback since no labels match configuration

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[stankiewicz]

R: @liferoad as you contributed a lot to skills.

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