docs(orchestrator): QoL build services — CLI providers, caching, LFS, hooks

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Summary

Documents features from game-ci/unity-builder#777:

• CLI provider protocol — How to write providers in any language (Go, Python, Rust, shell). Covers subcommands, JSON stdin/stdout contract, streaming output, timeouts, error handling. Includes a complete shell script example and CLI vs TypeScript comparison.
• Submodule profiles — YAML-based selective submodule initialization with glob patterns and variant overlays.
• Local build caching — Filesystem cache for Unity Library and LFS objects between local builds.
• Custom LFS transfer agents — Register external Git LFS backends (elastic-git-storage, lfs-s3).
• Git hooks — Detect and install lefthook or husky during builds.

Dependencies

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

New files

• docs/03-github-orchestrator/05-providers/06b-cli-provider-protocol.mdx
• docs/03-github-orchestrator/07-advanced-topics/10-build-services.mdx

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