feat(optional-skills): add Feishu Card Builder skill

[Minksgo]

Summary

Adds a new optional skill Feishu Card Builder for composing Feishu/Lark interactive card messages without manual JSON construction.

Problem

Hermes Agent already supports Feishu messaging via the built-in feishu.py gateway platform, but there is no skill-level utility for the agent to easily compose and send formatted interactive card messages (metrics, tables, lists) during conversation.

Solution

A new optional skill under optional-skills/communication/feishu-card-builder/:

• MetricCard — key-value KPI display with color-coded headers (blue, green, red, etc.)
• TableCard — structured data rendered as Feishu-native markdown grids (rendered as bordered tables by Feishu post API)
• ListCard — itemized content with icons and descriptions
• CLI interface — can be called via terminal for agent usage:

python3 ~/.hermes/skills/communication/feishu-card-builder/scripts/feishu_card_builder.py metric \
  --header "📊 Status" --items "Uptime:99.9%" "Users:1,247" --color green

Design decisions

• Pure Python stdlib only — no additional dependencies required
• wide_screen_mode: false by default for mobile-friendly display
• CLI uses subcommands (metric/table/list) for clear agent intent
• Compatible with existing feishu.py gateway — outputs standard interactive card JSON

Testing

# Metric card
python3 feishu_card_builder.py metric --header "📊 Test" --items "A:1" "B:2" --color green

# Table card
python3 feishu_card_builder.py table --header "📋 Table" --columns "X,Y" --rows "1,2" "3,4"

# List card
python3 feishu_card_builder.py list --header "📌 List" --items "✅ Done:Ready" "⏳ Wait:Pending"

Related

• Issue [Feishu] Markdown tables not rendering in Feishu messages #9549 — Feishu Markdown tables not rendering
• Issue feat(feishu): render markdown tables as Feishu interactive card table elements #27768 — render tables as card table elements
• Issue fix(feishu): re-enable post-mode rendering for markdown tables #29166 — re-enable post-mode rendering for tables