Add agentic-sdlc-scaffold (Tools & Utilities)

[Koshux]

What

Adds agentic-sdlc-scaffold to the 🛠️ Tools & Utilities section.

• Copyable Claude Code + GitHub Copilot configuration you vendor into your own repo: AGENTS.md operating manual, layered rules, stage-gate skills for spec review, self code review, and PR-bot review triage, enforcement hooks with tests, and an /adopt skill that adapts the scaffold to the target repo.
• MIT licensed, v0.1.0.

Checklist

• Entry follows the existing format: [**name**](url) - (N ⭐) - Description.
• Star count recorded at submission time, per the list's static-count convention.
• Placed at the tail of the section, consistent with descending star-count ordering.
• One entry, one line changed.

[Copilot]

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[Koshux]

Review @copilot