[instructions] Sync github-agentic-workflows.md with 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 project: field documentation: Documents GitHub Projects integration configuration with both string and object formats, including fields like url, scope, max-updates, max-status-updates, and github-token
• Enhanced assign-to-agent documentation: Added missing fields allowed, max, and target that enable fine-grained control over agent assignment
• Clarified integration: Connected project: field to update-project safe-output for automated project tracking workflows

Documentation Commits Reviewed

• 6bf9937 - chore: create parent issue for agent (chore: create parent issue for agent #12354)
  • Introduced security-alert-burndown workflow demonstrating project field and enhanced assign-to-agent configuration

Validation

• Followed prompting best practices (imperative mood, minimal examples)
• Maintained technical tone and brevity
• Updated only necessary sections
• Verified accuracy against current codebase (checked pkg/workflow/frontmatter_types.go and assign_to_agent.go)
• Removed outdated or redundant content (none found)

Pattern Documented

The new workflow pattern enables campaign-style automation where:

1. Workflow discovers work items (e.g., Dependabot PRs)
2. Updates project board using update-project safe-output
3. Creates parent tracking issue with bundling plan
4. Assigns parent issue to agent using assign-to-agent with target: "*"

This pattern is now properly documented for reuse in other workflows.

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