Add placeholder pages for Guides and Reference sections

- guides/method/index.md - The Method (coming soon)
- guides/ai/index.md - AI Collaboration (coming soon)
- guides/examples/index.md - Examples (coming soon)
- reference/index.md - Reference (coming soon)

Prevents 404 errors when navigating from Get Started links.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: michellejw

src/content/docs/guides/ai/index.md

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+---
+title: AI Collaboration
+description: How to work effectively with AI coding assistants.
+---
+
+This section is coming soon. It will cover:
+
+- AI as a thinking partner, not just a code generator
+- Writing specs with AI assistance
+- Rules files (CLAUDE.md, .cursorrules, etc.)
+- Reviewing AI-generated output
+- The feedback loop between specs and implementation
+
+For now, start with the [Get Started guide](/spec-driven-site/get-started/).

src/content/docs/guides/examples/index.md

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+---
+title: Examples
+description: Complete examples of spec-driven projects.
+---
+
+This section is coming soon. It will include:
+
+- Data pipeline example
+- Algorithm implementation example
+- Analysis tool example
+
+Each example will show the full journey from initial spec through implementation.
+
+For now, see the [Your First Spec](/spec-driven-site/get-started/first-spec/) walkthrough for a smaller example.

src/content/docs/guides/method/index.md

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+---
+title: The Method
+description: A deeper look at spec-driven development.
+---
+
+This section is coming soon. It will cover:
+
+- What spec-driven development is and why it matters
+- What makes a good specification
+- The workflow from spec to implementation
+- When this approach helps (and when it's overkill)
+
+For now, start with the [Get Started guide](/spec-driven-site/get-started/).

src/content/docs/reference/index.md

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+---
+title: Reference
+description: Templates and reference materials.
+---
+
+This section is coming soon. It will include:
+
+- Spec templates for different use cases
+- Spec format style guide
+- Quick reference for spec syntax
+
+For now, the [scaffolding script](/spec-driven-site/get-started/scaffold/) generates templates with inline guidance to get you started.