docs: expand "Write Operations Fail" troubleshooting stub in common-issues.md

[Copilot]

The "Write Operations Fail" section was a two-sentence stub while every adjacent section provides YAML examples, links, and step-by-step guidance — a common onboarding friction point.

Changes

• docs/src/content/docs/troubleshooting/common-issues.md
  • Replaces the stub with an explanation of why direct writes are disallowed and how safe-outputs acts as the intermediary
  • Adds a YAML frontmatter example showing create-issue (with config) alongside add-comment and update-issue (defaults, annotated inline)
  • Links to the Safe Outputs reference and specification pages for further reading

safe-outputs:
  create-issue:
    title-prefix: "[bot] "
    labels: [automation]
  add-comment:      # no configuration required; uses defaults
  update-issue:     # no configuration required; uses defaults

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[Copilot]

Pull request overview

Expands the troubleshooting guidance for “Write Operations Fail” by explaining the write-safety model and showing how to declare required safe-outputs in workflow frontmatter.

Changes:

• Replaces the prior stub with an explanation that write operations must be executed via safe-outputs.
• Adds a YAML example demonstrating configured (create-issue) and default (add-comment, update-issue) safe outputs.
• Links to the Safe Outputs reference and the Safe Outputs specification for follow-up details.

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