docs: tighten talk-to-grok-bot Skill for GPT-6 Astra

[ScriptedAlchemy]

Summary

• Tighten Skill description frontmatter to discriminating WHEN triggers (GPT-6 Astra guidance).
• Slim / contextualize AGENTS.md and Skill bodies so hosts load less overlapping instruction context.
• Preserve real safety and production boundaries.

Test plan

• Skill YAML frontmatter still has name + description
• Spot-check Skill activation text in a host after install/rebuild if applicable

[changeset-bot]

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Latest commit: 841860f

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[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-15T02:54:50.929089Z	841860f	PR opened

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