Improve benchmark case details and score chart scaling (#146)

Co-authored-by: Yaowei Zheng <hiyouga@buaa.edu.cn>

changelog/unreleased/2026-07-31-evaluation-center-case-details.md

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+# Evaluation Center Case details and Score charts
+
+Case details now separate the task materials visible to the Target Agent from the scoring rubric available to project members, while keeping both file roots path-confined. Score charts use a padded dynamic axis without discarding authoritative stored values, and the benchmark Skills use YAML folded scalars for Scoreboard summaries.
+
+## Details
+
+- Case details show task materials and scoring rubrics as separate file groups. Rubrics remain hidden from the Target Agent.
+- Score charts pad the observed in-range values, clamp the displayed axis to 0–100, and preserve stored finite values for plotting and tooltips.
+- Benchmark design and optimization Skills write summary fields as YAML folded scalars and parse the complete Scoreboard after appending an Evaluation.

changelog/unreleased/README.md

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 Changes since v0.1.5. The version number is assigned at release, when this folder is renamed.
 
+- [2026-07-31] Evaluation Center: Case details separate Target Agent task materials from project-member-visible scoring rubrics, Score charts use a padded dynamic axis without discarding stored values, and the benchmark Skills write YAML-safe Scoreboard summaries. ([details](2026-07-31-evaluation-center-case-details.md))
+
 - [2026-07-30] Web App: the main conversation's file summary moves to the completed Task boundary — one card per Task scanning all of its assistant text, nested agent conversations keep their per-message summaries, and file-existence caching stops retaining negative results so a later Task can surface a newly created path. ([details](2026-07-30-file-summary-task-boundary.md))