[instructions] Sync github-agentic-workflows.md with v0.40.1

[github-actions]

Instructions Update - Synchronized with v0.40.1

This PR updates the github-agentic-workflows.md file based on code changes since the last release (v0.40.1, 2026-02-03).

Changes Made

• SRT sandbox deprecation: Removed "srt" and "sandbox-runtime" as valid sandbox string options (the Anthropic Sandbox Runtime backend was removed). Added auto-migration note. Removed the SRT configuration example block. Added entry to Deprecated Features section.
• allowed-extensions for cache-memory: Documented the new allowed-extensions parameter for single and multi-cache configurations (default: all extensions allowed).
• allowed-extensions for repo-memory: Expanded the sparse repo-memory section with an advanced configuration example including allowed-extensions and other supported fields (branch-name, target-repo, max-file-size, max-file-count).
• Validation section: Added "gemini" to the list of valid engine values (was missing alongside copilot/claude/codex).

Documentation Commits Reviewed

• c0bccf1 Fix failing JS test: sync expected labels with implementation (not docs-related)

Code Files Audited

• pkg/workflow/compiler_types.go — SafeOutputsConfig struct verified against instructions
• pkg/workflow/safe_outputs_config.go — parsing logic confirmed
• pkg/parser/schemas/main_workflow_schema.json — JSON schema reviewed for sandbox, cache-memory, repo-memory
• pkg/workflow/sandbox.go — confirmed SRT auto-migration to AWF
• pkg/workflow/cache.go — confirmed allowed-extensions implementation
• pkg/constants/constants.go — confirmed default AllowedExtensions = []string{} (all allowed)

Validation

• Followed prompting best practices (imperative mood, minimal examples)
• Maintained technical tone and brevity
• Updated only necessary sections
• Verified accuracy against current codebase
• Removed outdated or redundant content (SRT example block)

Generated by Instructions Janitor · ◷

• expires on Mar 7, 2026, 12:01 AM UTC

[Copilot]

Pull request overview

This PR synchronizes the github-agentic-workflows.md instructions file with code changes in release v0.40.1. The update removes deprecated SRT sandbox references, documents new allowed-extensions parameters for memory tools, and adds the missing gemini engine to the validation section.

Changes:

• Removed "srt" and "sandbox-runtime" as valid sandbox options, added auto-migration note and deprecation entry, and removed the SRT configuration example block.
• Documented the allowed-extensions parameter for both single and multi-cache cache-memory configurations, and added an advanced configuration example for repo-memory with allowed-extensions, branch-name, target-repo, max-file-size, and max-file-count.
• Added "gemini" to the list of valid engine enum values in the validation section.

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