docs: keep changeset summaries to one line

[mgabor3141]

Small contributor-guidance update: changeset summaries land in CHANGELOGs verbatim, so keep them to a single line whenever possible.

[greptile-apps]

Greptile Summary

This PR adds a brief note to AGENTS.md asking contributors to keep changeset summaries to a single line, since they appear verbatim in the CHANGELOG. The change is documentation-only and introduces no code or behavioral modifications.

Confidence Score: 5/5

Safe to merge — documentation-only change with no code impact.

Single-line prose addition to a contributor guide. No logic, no runtime code, no schema changes.

No files require special attention.

Important Files Changed

Filename	Overview
AGENTS.md	Single-sentence addition to the changeset guidance, instructing contributors to keep summaries to one line for CHANGELOG readability.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Contributor makes changes] --> B[Run yarn changeset]
    B --> C{Write summary}
    C -->|Single line ✅| D[Summary appears cleanly in CHANGELOG]
    C -->|Multi-line ⚠️| E[CHANGELOG entry becomes unwieldy]

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