docs(ops): add action failure triage and contribution guardrail rules (#164)

[pcoletsos]

Linked issue

Linked issue: Fixes #164

Summary

Adds mandatory agent instructions in AGENTS.md and GEMINI.md for automated CI failure triage (gh run view <run_id> --log-failed) and pre-flight guardrail validation.

Affected scope

• cluster
• services
• ops
• docs

Pre-flight & local validation

• Contribution guardrails
• Manifest validation
• Kustomize validation
• Existing infra validation
• Not run (reason described below)

Documentation impact

• No docs changes required
• Docs updated in this PR
• Docs follow-up issue linked below

Risk & Rollback

• Not risky / no rollback needed
• Rollback plan included below

[Copilot]

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[github-actions]

🤖 Automated PR Review

Summary

• Adds several new meta files, including contribution guidelines, issue templates, and a pull request template.
• Introduces a Python script for validating contribution guardrails and a GitHub workflow to enforce it.
• Updates documentation files (README.md, AGENTS.md, CLAUDE.md, CONTRIBUTING.md) with repository guidelines and policies.
• No new or modified n8n workflow JSON files are included in this PR.

Safety Assessment

NOT A TEMPLATE PR

This PR does not add or modify any n8n workflow JSON files. It focuses on repository meta files and documentation updates.

Action Items

Not a template submission — review manually.

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_{Reviewed by openai/gpt-4o via GitHub Models · Workflow run}