skill: package weaviate/agent-skills into dockyard

[JAORMX]

Package agent skills from weaviate/agent-skills into the Dockyard registry.

Source

• Repo: https://github.com/weaviate/agent-skills
• License: BSD-3-Clause
• Upstream HEAD (at survey time): 2f62f9f
• Skill count upstream: 2
• Trust signal: Official Weaviate (vector DB)

Candidate skills

• weaviate
• weaviate-cookbooks

Acceptance criteria

• One spec.yaml per skill under skills/<name>/
• spec.ref pinned to an audited upstream commit SHA
• task validate-skill passes for each
• task scan-skill findings triaged
• Single PR grouping all Weaviate skills (branch skills/weaviate)

Part of the vendor-by-vendor sweep following #466 (Trail of Bits).