feat: add initial skill authoring workspace

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

VERIFY.md

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+# VERIFY
+
+Use this checklist when validating the `skill_lib` repository.
+
+## Structural Checks
+
+- All runtime packages live under `skill_lib/skills/`.
+- Each skill package contains a `SKILL.md` or `SKILL.toml` plus a maintained `SKILL.md`.
+- Each current skill package contains a `references/` directory.
+- Each current skill package contains an `assets/` directory.
+- Long operational detail lives in `references/`, not only in `SKILL.md`.
+- Preserved remote source artifacts live in `assets/`.
+- Browser extraction skills that promise structured output use `scripts/` when a deterministic script is required.
+- Browser skills define blocked/login/captcha behavior explicitly instead of reporting only "no data".
+- Downstream export/presentation skills consume upstream artifacts instead of recollecting browser data.
+
+## Repository Scope Checks
+
+- This repository does not contain Rust runtime dispatch code.
+- This repository does not contain browser transport implementation code.
+- This repository does not copy the original remote Rust modules into the skill packages.
+- The repository is a skill description library, not a runtime executable.
+
+## Package Inventory
+
+Current packages:
+
+- `zhihu-navigate`
+- `zhihu-write`
+- `zhihu-hotlist`
+- `zhihu-hotlist-screen`
+- `office-export-xlsx`
+
+## Recommended Commands
+
+```bash
+find /home/zyl/projects/sgClaw/skill_lib/skills -mindepth 2 -maxdepth 2 -name SKILL.md | sort
+find /home/zyl/projects/sgClaw/skill_lib/skills -type d \( -name references -o -name assets \) | sort
+rg -n "^name: |^description: |^version: |^author: |^tags:" /home/zyl/projects/sgClaw/skill_lib/skills/*/SKILL.md
+python3 /home/zyl/projects/sgClaw/claw/scripts/validate_skill_lib.py
+```
+
+From `/home/zyl/projects/sgClaw/claw`, run the project-local unit test suite:
+
+```bash
+python3 -m unittest tests.skill_lib_validation_test -v
+python3 -m unittest tests.skill_script_hotlist_extractor_test -v
+```
+
+## Expected Outcome
+
+- Exactly five active skill packages exist.
+- Each package has both `references/` and `assets/`.
+- Each maintained skill document exposes the standardized frontmatter keys used by this repository.
+- The project-local validator reports `PASS` for all active packages.
+- Browser-script packages pass their dedicated script-level regression tests.
+
+## Known Caveat
+
+- `skills/zhihu-hotlist/assets/zhihu_hotlist_flow.source.json` was reconstructed from an earlier successful source fetch because the remote endpoint timed out during the final implementation batch. Its content matches the previously captured remote flow used in analysis.