feat: add initial skill authoring workspace

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

skills/zhihu-hotlist/references/report-format.md

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+# Report Format
+
+The source report mode renders a compact text report from a snapshot.
+
+## Header Line
+
+Use this structure:
+
+```text
+知乎热榜报告 <snapshot_id>: 共 <item_count> 条，采集于 <captured_at_ms>
+```
+
+## Per-Item Line
+
+Use this structure:
+
+```text
+<rank>. <title> | 热度 <heat_text> | 评论指标 <metric_count> 条 | 回复 <reply_total> | 赞同 <upvote_total> | 收藏 <favorite_total> | 红心 <heart_total>
+```
+
+## Field Semantics
+
+- `metric_count`: number of collected comment metric records for the item
+- `reply_total`: sum of reply counts across collected records
+- `upvote_total`: sum of upvote counts across collected records
+- `favorite_total`: sum of favorite counts across collected records
+- `heart_total`: sum of heart counts across collected records
+
+## Missing-Metric Handling
+
+If an item has no collected comment metrics:
+
+- keep the item in the report
+- show metric count as `0`
+- explicitly note partial data elsewhere in the result summary if the run was incomplete
+
+## Report Mode Behavior
+
+- If a specific snapshot ID is supplied, report from that snapshot.
+- Otherwise, use the latest known snapshot.
+