feat(ingest): downstream skill-forge authoring and benchmarking engine

[harshsinghmp]

Classification

actionable-feature

Context & Rationale

AgriciDaniel/skill-forge provides an end-to-end framework for authoring, evaluating, auditing (0-100 score), and benchmarking production-grade Agent Skills conforming to the open Agent Skills standard.

Scope & Ingestion Plan

1. Ingest upstream from https://github.com/AgriciDaniel/skill-forge.
2. Place into skills/engineering/skill-forge.
3. Register in skills.manifest.json and catalog under Engineering & Architecture.

Verification Criteria

• skills/engineering/skill-forge/SKILL.md exists and passes manifest schema validation.
• Registered in skills.manifest.json.
• Validated via bun test.