docs(providers): CLI provider protocol

[frostebite]

Summary

• Documents the CLI provider protocol for writing providers in any language (Go, Python, Rust, shell scripts)
• Covers subcommands, JSON stdin/stdout contract, streaming output, timeouts, error handling
• Includes a complete shell script example and a comparison table (CLI vs TypeScript)

Dependencies

• Code: feat(orchestrator): QoL for large projects — CLI providers, caching, LFS, hooks unity-builder#777 (CLI provider implementation)
• Docs base: docs(orchestrator): comprehensive documentation update for LTS version #532 (orchestrator docs overhaul — this branch is based on document-provider-plugins)

New files

• docs/03-github-orchestrator/05-providers/06b-cli-provider-protocol.mdx

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[frostebite]

Merged into #535 to keep one docs PR per unity-builder code PR.

[github-actions]