fix(skills): quote argument-hint YAML values as strings

[thejesh23]

Description

Fixes a YAML frontmatter bug in 7 skills + 1 documentation example. GitHub Copilot CLI 1.0.65 tightened its skill-loader validation to require argument-hint to be a string. When the value is written with bare YAML brackets, YAML parses it as a one-element flow sequence — a list, not a string — so the loader silently rejects the skill and it disappears from the command menu.

# Before — parses as list ['takeout-zip-path']  ❌
argument-hint: [takeout-zip-path]

# After — parses as string '[takeout-zip-path]'  ✅
argument-hint: "[takeout-zip-path]"

Verified with yaml.safe_load — every changed frontmatter now returns argument-hint as str, not list.

Also latent on Claude Code today; see anthropics/claude-code#22161.

Type of Change

• Bug fix (non-breaking change which fixes an issue)

Files changed (8)

Real skill frontmatters (7):

• gemini-history-analyzer/SKILL.md
• product-analysis/SKILL.md
• feishu-doc-scraper/SKILL.md
• notify-wecom/SKILL.md
• daymade-audio/asr-transcribe-to-text/SKILL.md
• daymade-claude-code/continue-claude-work/SKILL.md
• daymade-claude-code/marketplace-dev/SKILL.md

Documentation example (1):

• daymade-skill/skill-creator/SKILL.md — the "YAML Frontmatter Reference" code block (around line 235) previously showed argument-hint: [topic] as the canonical example, which taught downstream skill authors to reproduce the bug. Updated to argument-hint: "[topic]". Left intact: the "Bad:" example around line 389 — that block deliberately shows a buggy pattern to warn users NOT to overload argument-hint with manual flags, and rewriting it would defeat the pedagogical point.

Test plan

• yaml.safe_load on each changed frontmatter — type(argument-hint) == str for all 7 real files
• find . -name '*.md' | xargs grep '^argument-hint: \[' — only the intentional "Bad:" doc example on line 389 remains
• On Copilot CLI 1.0.65+, copilot skill list shows all 7 skills after install (maintainer to verify locally if desired)

Related Issues

None open on this repo. Same class of latent bug on Claude Code: anthropics/claude-code#22161.

[thejesh23]

Tracking issue: #122 — captures the bug diagnosis and reproducer separately for anyone searching the repo who lands there before this PR.