[instructions] Sync github-agentic-workflows.md with v0.35.1

[github-actions]

Instructions Update - Synchronized with v0.35.1

This PR updates the github-agentic-workflows.md file based on documentation changes since the latest release (v0.35.1, released 2026-01-06).

Changes Made

Breaking Change: Agent Task → Agent Session Terminology

• Updated create-agent-task to create-agent-session in safe-outputs documentation
• Added deprecation notice: "create-agent-task is deprecated (use create-agent-session)"
• Updated field descriptions to use "agent sessions" terminology
• Reflects CHANGELOG breaking change in Unreleased section

New Feature: Close Older Discussions

• Added close-older-discussions field to create-discussion safe-output configuration
• Documents automatic closure of older discussions matching same prefix/labels
• Up to 10 older discussions closed as "OUTDATED" with link to new discussion
• Requires title-prefix or labels to identify matching discussions
• Based on new ephemerals documentation added in commit c670457

Documentation Commits Reviewed

• c670457 - Add ephemerals documentation for expiration and noise reduction features (Add ephemerals documentation for expiration and noise reduction features #9273)
  • Reviewed new docs/src/content/docs/guides/ephemerals.md file (399 lines)
  • Extracted relevant features for instructions file

Validation

• Followed prompting best practices (imperative mood, minimal examples)
• Maintained technical tone and brevity
• Updated only necessary sections (surgical edits)
• Verified accuracy against current codebase
• No redundant content added

Notes on Ephemerals Coverage

The new ephemerals documentation includes multiple capabilities. This PR focuses on documenting only the new fields and breaking changes:

Already Documented (no changes needed):

• ✅ expires field for issues, discussions, PRs (lines 330-336)
• ✅ hide-older-comments field for comments (lines 386-391)
• ✅ allowed-github-references security config (lines 623-638)
• ✅ stop-after workflow deadline (lines 82)

New Additions in This PR:

• ✅ close-older-discussions field (line 362)
• ✅ create-agent-session terminology update (line 560-567)

The instructions file remains concise and focused on schema documentation, while the full ephemerals guide provides comprehensive patterns and use cases in the main documentation.

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