DOC-344: add agents.md MVP Docs Agent, LocalStack for AWS docs

[quetzalliwrites]

Summary

• Adds agents.md at the repo root — a guide for AI coding agents working in this docs repository
• Covers the full workflow an agent should follow: understand the task, research before writing, check existing patterns, write, and verify
• Includes anti-hallucination guardrails and an explicit halt/consent protocol for ambiguous cases
• Documents writing style, tone, and what sections every service page and tutorial must include
• Provides copy-paste page structure templates for service pages and tutorials
• Covers code example conventions, linking rules, repo structure, frontmatter schema, components, build commands, redirects, and key gotchas

Why

This is the MVP for a docs agent workflow. The agents.md file acts as the single source of truth that any AI agent reads before touching the repo, ensuring consistency with our internal standards without needing repeated prompting.

Test plan

• Tested against a real ticket (DOC-310) — agent followed the workflow, produced correct output, and correctly halted when data was thin before writing
• Review the workflow steps and writing conventions for completeness
• Review the page structure templates against current service pages

Closes out: https://linear.app/localstack/issue/DOC-344/docs-build-mvp-aws-docs-agent

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