Fix publish workflow by aligning SKILL frontmatter with Intent schema

[Copilot]

The publish GitHub Actions job failed because intent validate skills rejected non-spec top-level frontmatter keys in SKILL files. This updates skill metadata shape to match the validator contract used in the publish path.

• Root cause addressed

  • type, library, and library_version were defined as top-level frontmatter keys, which the validator now treats as invalid.

• Change applied

  • Moved those fields under metadata in:
    • seitu/skills/seitu/SKILL.md
    • seitu/skills/seitu-overview/SKILL.md

• Impact

  • Restores compatibility with intent validate skills executed during prepublishOnly / publish workflow.

# Before
---
name: seitu
type: core
library: seitu
library_version: "0.16.1"
---

# After
---
name: seitu
metadata:
  type: core
  library: seitu
  library_version: "0.16.1"
---

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Project	Deployment	Actions	Updated (UTC)
seitu	Ready	Preview, Comment	Jul 2, 2026 11:15am