feat(skill-creator): Add skill packaging, validation, and evaluation scripts

- Implemented `package_skill.py` to create distributable .skill files from skill folders, including validation checks for SKILL.md.
- Added `quick_validate.py` for basic validation of skill frontmatter in SKILL.md, ensuring required fields and correct formats.
- Created `run_eval.py` to evaluate skill descriptions against a set of queries, checking for triggering behavior and outputting results in JSON format.
- Developed `run_loop.py` to facilitate an iterative evaluation and improvement process for skill descriptions, including train/test split functionality.
- Introduced utility functions in `utils.py` for parsing SKILL.md files, extracting name and description.

Author: hotlong

.claude/skills/ai-sdk

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+../../skills/objectstack-ai

.agents/skills/ai-sdk/SKILL.md .claude/skills/ai-sdk/SKILL.md.agents/skills/ai-sdk/SKILL.md renamed to .claude/skills/ai-sdk/SKILL.md

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+../../skills/objectstack-api

…s/skills/ai-sdk/references/ai-gateway.md …e/skills/ai-sdk/references/ai-gateway.md.agents/skills/ai-sdk/references/ai-gateway.md renamed to .claude/skills/ai-sdk/references/ai-gateway.md .agents/skills/ai-sdk/references/ai-gateway.md renamed to .claude/skills/ai-sdk/references/ai-gateway.md

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+../../skills/objectstack-automation

…kills/ai-sdk/references/common-errors.md …kills/ai-sdk/references/common-errors.md.agents/skills/ai-sdk/references/common-errors.md renamed to .claude/skills/ai-sdk/references/common-errors.md .agents/skills/ai-sdk/references/common-errors.md renamed to .claude/skills/ai-sdk/references/common-errors.md

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+../../skills/objectstack-data