chore: sync shared ai prompts

[jan-kubica]

Summary

• add the shared ai-shared submodule and generated AGENTS/CLAUDE/GEMINI guidance
• add sync wrappers and an AI Instructions workflow that checks generated prompt drift
• add repo-specific local instructions for this package

Checks

• bash -n scripts/sync-ai-skills.sh scripts/link-codex-skills.sh
• bash scripts/sync-ai-skills.sh --check

[gemini-code-assist]

Code Review

This pull request introduces AI agent development guidelines, custom skills, and commands, along with a shared submodule and synchronization scripts. The feedback suggests ensuring that the newly added wrapper scripts (sync-ai-skills.sh and link-codex-skills.sh) change their working directory to the repository root at execution time to prevent relative path resolution issues.

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[chatgpt-codex-connector]

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