[skill-update] skill(github-agentic-workflows): add threat-detection reference URL

[github-actions]

Summary

Updates the skills/github-agentic-workflows skill to add a reference link to the official GH-AW threat-detection documentation page.

Material Delta

references/security-and-operations.md — Added URL reference to https://github.github.com/gh-aw/reference/threat-detection/ in the Safe Outputs section (point 3), following the existing pattern in the same file that already links to:

• https://github.github.com/gh-aw/reference/cost-management/
• https://github.github.com/gh-aw/reference/outcomes/
• https://github.github.com/gh-aw/guides/open-telemetry/

Source justification: The GH-AW home page (https://github.github.com/gh-aw/) navigation confirms a dedicated /gh-aw/reference/threat-detection/ page exists as a named guardrail layer alongside safe-outputs, cost-management, and outcomes. The current skill described threat detection accurately but left this reference unlinked unlike the other reference pages.

SKILL.md — Version bumped from 1.5 → 1.6.

Validation

• Metadata validated against checklist: name format ✓, description length ✓, no first-person terms ✓, negative trigger present ✓
• No other files warranted changes: all CLI commands, frontmatter fields, security model layers, and workflow patterns in the skill are consistent with the prefetched home-page source.

Unresolved Risks

• The home-page source alone does not reveal the full content of the threat-detection reference page. If that page contains guidance that materially differs from the skill's description of threat detection, a follow-up update sourcing that page directly would be needed.
• The skill version 1.6 references gh aw v0.58.3 compiler caveats. These remain accurate per the prefetched source, but should be re-validated when a new CLI version ships.

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