chore: sync with upstream anthropics/claude-code-action

[claude]

Automated sync of inputs, outputs, and documentation with upstream anthropics/claude-code-action.

Changes

New Input Added

• display_report: Display Claude Code Report in GitHub Step Summary (set to 'false' to disable when using custom formatting)
  • Default: true
  • Added to action.yml inputs section
  • Added pass-through in "Run Claude Code" step
  • Added to README.md input table

Updated Documentation

• structured_output output description: Updated to match upstream's more detailed description that explains how to parse the JSON string using fromJSON()
  • Updated in both action.yml and README.md

Upstream reference

• Latest release: v1 (Claude Code GitHub Action v1.0)
• Release date: 2025-08-26T17:01:10Z
• Release created: 2026-02-13T19:56:31Z

This release brings the v1.0 GA release improvements including simplified configuration, automatic mode detection, and enhanced flexibility.

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Created automatically by the upstream-sync workflow.

[claude]

Clean sync. New input properly documented and passed through, improved output description adds useful parsing guidance. Ready to merge.