Add resume-screening skill - #1763

Reviewed as a fresh pass — this looks solid. Verified on macOS / python3:

• ✅ Layout: only skills/resume-screening/* plus a 10-line marketplace.json entry; nothing else touched.
• ✅ python3 -m py_compile passes on extract.py and build_report.py; both are stdlib-only, use argument-list subprocess calls (no shell interpolation), and make no network calls — candidate data stays local, matching the privacy note at the end of SKILL.md.
• ✅ build_report.py HTML-escapes (html.escape) every interpolated value before it reaches the Chrome-rendered report.
• ✅ Frontmatter is spec-clean: quick_validate.py <dir> → "Skill is valid!" (kebab-case name, 146-char description, well under the 1024 cap); marketplace.json parses.
• ✅ Workflow doc is actionable — defaults, the [文本过少] fallback for image-only resumes, and the "inspect the generated PDF" step are all explicit.

Suggestions:

1. $S hardcodes an install path. SKILL.md L10 sets $S=~/.claude/skills/resume-screening/scripts/, but no other skill in the repo assumes an install location — they reference paths relative to the skill dir (e.g. python scripts/with_server.py in skills/webapp-testing). Installed via the plugin marketplace instead of copied to ~/.claude/skills, that path won't exist; scripts/… relative to the skill directory would be more robust.
2. export_mail.applescript requires 应聘 in the subject (hardcoded in the Mail filter alongside the keyword list). That's documented in the script's header but not in SKILL.md, so subjects worded differently return an empty export with no explanation — worth a line in step 1.
3. Optional: the description is Chinese-only; every other skill in this repo has an English description, so a bilingual one may trigger more consistently.
4. Tiny: the standalone , on its own line in marketplace.json is valid JSON but inconsistent with the }, style used elsewhere.

(This repo has no GitHub Actions workflows, so there's nothing CI-side to wait on.) Nice work — the risk-signal checklist (time overlaps, copy-paste tells, inflated numbers) is a helpful addition.