Project orientation for any agent (human/AI/hybrid) working in the repo.
Covers: project structure (current + planned), build/lint/test commands,
Rust code style (formatting, naming, error handling, async/concurrency,
learner-facing documentation comments), terminology policy (inclusive
language + ICE-as-protocol-convention exception), architecture
pre-reading order, key decisions to respect, git workflow, and the
slice-1 boundaries (what NOT to add yet).
