Add reusable LLM agent prompt templates

[iwillig]

Provide common user prompts that guide LLM agents toward best practices and prevent common failure modes. These templates help users enforce code review workflows, error handling guardrails, and test-driven development patterns without rewriting prompts for each interaction.

[github-actions]

Git Hygiene — Issues Found

c8110641 — Add reusable LLM agent prompt templates

Structure feedback:

• LLM analysis error: Expecting value: line 1 column 1 (char 0)

Score: 0/10

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