Add Contextual Prompts pattern

[devill]

Summary

• Adds new pattern: Contextual Prompts - embed guidance directly in script outputs (error messages, CLI responses) instead of front-loading instructions in CLAUDE.md
• This is a generalization of the principle behind Habit Hooks

Discussion Requested

@lexler - I'd like to discuss whether we should restructure the relationship between these related patterns:

• Contextual Prompts (this new one) - the fundamental principle of putting guidance where it will be seen at the right moment
• Habit Hooks - a more specific implementation that uses hooks to guarantee scripts run and detect violations
• Reminders - techniques for injecting reminders into conversations
• Hooks - the infrastructure pattern that enables Habit Hooks

Currently I've set up habit-hooks -->|uses| contextual-prompts and contextual-prompts <-->|similar| reminders, but there might be a cleaner way to organize this family of patterns. Open to suggestions!

Test plan

• npm run validate passes (relationships are valid)
• Pattern renders correctly on site

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