refactor(create-expert): add error recovery guidance to expert templates

[FL4TLiN3]

Summary

Add explicit error handling sections to expert templates to ensure all experts provide actionable "To fix:" guidance when errors occur.

Changes

Main Expert Template:

## Error Handling
When errors occur, provide actionable guidance:
- "❌ Error: [what went wrong] | To fix: [specific steps]"
- Never fail silently - always explain what happened and how to resolve it

Setup Expert Template:

## Error Handling
When setup fails, guide the user:
- "❌ Failed: [what went wrong] | To fix: [specific steps]"
- Suggest running the doctor expert for diagnostics

Rationale

This reinforces Design Principle #7: "All errors must include 'To fix: ...' guidance". The Doctor Expert Template already had this, but Main and Setup templates did not.

Closes #362

🤖 Generated with Claude Code

---

Note

Summary

Strengthens error guidance across expert templates by standardizing messages that include actionable "To fix:" steps.

• Updates apps/create-expert/src/lib/create-expert-toml.ts:
  • Main Expert template: adds ## Error Handling with formatted error output and no-silent-fail policy
  • Setup Expert template: adds ## Error Handling with failure format and suggestion to run the doctor expert
• Adds .changeset/add-error-recovery-guidance.md documenting a patch change and the new guidance

Reinforces Design Principle #7: All errors must include "To fix: ..." guidance.

^{Written by Cursor Bugbot for commit 4f6ebc2. This will update automatically on new commits. Configure here.}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!