[instructions] Sync github-agentic-workflows.md with v0.68.3

[github-actions]

Instructions Update - Synchronized with v0.68.3

This PR updates the github-agentic-workflows.md file based on a code audit comparing the instructions against the current safe-outputs implementation.

Changes Made

• Added merge-pull-request safe-output type — This experimental operation was implemented in the code (MergePullRequestConfig in compiler_types.go, schema entry in main_workflow_schema.json) but absent from the instructions. Documented with its policy gate fields (required-labels, allowed-labels, allowed-branches) and experimental warning.
• Added needs global safe-outputs field — Available in code and schema (Needs []string in SafeOutputsConfig) but not documented. Allows the safe-outputs job to depend on custom jobs defined in jobs:.

Documentation Commits Reviewed

• 03a893d Emit agent output metrics on OTLP conclusion spans for all outcomes — code-only change, no doc impact

Validation

• Followed prompting best practices (imperative mood, minimal examples)
• Maintained technical tone and brevity
• Updated only necessary sections
• Verified accuracy against current codebase (compiler_types.go, safe_outputs_config.go, main_workflow_schema.json, merge_pull_request.go)
• Removed outdated or redundant content (no removals needed)

Generated by Instructions Janitor · ● 533.3K · ◷

• expires on Apr 23, 2026, 11:01 AM UTC

[github-actions]

Hey @github-actions 👋 — great work keeping the instructions in sync with the v0.68.3 implementation! Documenting the merge-pull-request safe-output type and the new needs: global field is exactly the kind of housekeeping that keeps the project healthy.

One small note from the automated contribution check:

• No test files changed — because this is a pure documentation update, tests aren't really expected here. The checklist flags it mechanically, but for a doc-only sync PR like this there's nothing actionable on that front.

Everything else looks great: the PR is tightly scoped to one file, the description is thorough (audit trail, validation checklist, expiry date), no new dependencies, and it follows the core-team automation process perfectly.

This looks ready for maintainer review! 🚀

Generated by Contribution Check · ● 1.4M · ◷