[instructions] Sync github-agentic-workflows.md with release v0.36.0

[github-actions]

Instructions Update - Synchronized with v0.36.0

This PR updates the github-agentic-workflows.md file based on documentation changes since the v0.36.0 release (2026-01-08).

Changes Made

• Added remove-labels safe-output type documentation (lines 468-477)
  • Includes configuration schema with allowed, max, target, and target-repo fields
  • Documents permission separation pattern
  • Follows existing documentation style and formatting

Documentation Commits Reviewed

• 87fe98f docs: Document remove-labels safe output type (docs: Document remove-labels safe output type #11425)
• d779ba0 Fix custom safe-outputs documentation: correct agent data access pattern (Fix custom safe-outputs documentation: correct agent data access pattern #11530)
• Recent commits from 2026-01-08 through 2026-01-23

Rationale

The remove-labels safe-output type was added to the reference documentation but was missing from the agent instructions file. This addition:

• Maintains consistency with the full safe-outputs reference documentation
• Provides agents with the capability to remove labels from issues/PRs
• Follows the principle of minimal, focused documentation by including only commonly-used features
• Complements the existing add-labels documentation

Validation

• Followed prompting best practices (imperative mood, minimal examples)
• Maintained technical tone and brevity
• Updated only necessary sections
• Verified accuracy against current codebase (docs/src/content/docs/reference/safe-outputs.md)
• Removed no content (pure addition)
• Positioned documentation logically (immediately after add-labels)

Design Decisions

Why only remove-labels?
While other safe-output types were added (e.g., create-project, copy-project, create-project-status-update), these are specialized campaign workflow features better covered in the full documentation. The instructions file aims for brevity and focuses on commonly-used operations. The remove-labels feature is a direct complement to add-labels and represents a basic labeling operation that agents frequently need.

Why this format?
The documentation follows the exact same pattern as add-labels for consistency, including:

• Brief description in bullet point header
• Minimal YAML configuration example
• Permission separation explanation
• Optional field annotations

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