[docs] Update documentation for allowed-extensions default behavior

[github-actions]

Documentation Updates - 2026-02-13

This PR updates the documentation based on features merged in the last 24 hours.

Features Documented

Memory Configuration Updates (from #15195 and #15263):

• Documented allowed-extensions field for cache-memory and repo-memory
• Updated default behavior: changed from restrictive list [".json", ".jsonl", ".txt", ".md", ".csv"] to empty array (all files allowed)
• Added explanations of file type restriction behavior

Changes Made

docs/src/content/docs/reference/memory.md:

• Added allowed-extensions field to Advanced Configuration sections for both cache-memory and repo-memory
• Added "File Type Restrictions" subsection under cache-memory explaining the field behavior
• Added "File Type Restrictions" note under repo-memory configuration explaining validation behavior

docs/src/content/docs/reference/frontmatter-full.md:

• Updated default value description for allowed-extensions in cache-memory section from Default: [".json", ".jsonl", ".txt", ".md", ".csv"] to Default: [] (empty/all files allowed)
• Updated default value description for allowed-extensions in repo-memory section to match

Merged PRs Referenced

• Add configurable file type restrictions to cache-memory and repo-memory with validation failure reporting #15195 - Add configurable file type restrictions to cache-memory and repo-memory with validation failure reporting
• [WIP] Change default allowed extensions in cache-memory to empty #15263 - Change default allowed extensions in cache-memory to empty (allow all files)
• Add fallback-as-issue field to disable PR creation fallback #15276 - Add fallback-as-issue field to disable PR creation fallback (already documented)
• 🔒 Enable GitHub Lockdown Mode Security Feature by default in public repos #15289 - Enable GitHub Lockdown Mode Security Feature by default in public repos (already documented)

Notes

The following features were already fully documented and did not require updates:

• fallback-as-issue field for create-pull-request (documented in safe-outputs.md and frontmatter-full.md)
• GitHub Lockdown Mode default behavior (documented in lockdown-mode.md)

This PR focuses on the memory configuration changes that needed documentation to reflect the new default behavior and explain the file type restriction feature.

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• expires on Feb 14, 2026, 8:30 AM UTC