Stand up the Rust implementation of the rule-based checker (the thing that
"stands in Lean's position" at product runtime). Single repo-wide cargo
workspace at the repo root so future components (e.g. an exporter) can reuse
shared crates.
- workspace: 6 member crates under crates/; cph-schema/cph-typst/cph-check/
cph-cli are stubs for later WUs that compile clean today.
- cph-diag: shared diagnostic vocabulary. Severity { Warning, Error } mirrors
Spec.Courseware.Diagnostic.Severity exactly (two-valued, no info/note — a
contract decision documented in-code since there's no CI gate for alignment).
Closed DiagCode set with stable string forms; Diagnostic with optional span +
fix hint; Display renders `error[CODE]: msg / --> file:line:col / hint: …`.
- cph-model: the ADR-0008 loader. Reads manifest.toml ([project]/[info]/ordered
[[parts]]/[targets.*]) + each part's element.toml into an ordered Lesson
(mirrors Lean `Lesson = List (Element P)`). Structure-only: cross-checks
part.kind == element.toml kind, rejects `..` traversal; does NOT do schema
validation (WU-3), content-file existence (WU-3), or typst (WU-4).
`load(root) -> (Option<Lesson>, Vec<Diagnostic>)`: Some even on collectible
part errors, None only on hard manifest failure.
- 13 tests (7 cph-diag, 6 cph-model incl. static fixtures doubling as format
docs). build + test + clippy -D warnings + fmt --check all green.
Judgment call flagged for review: cph-diag has no ManifestMalformed code, so
manifest-structure errors map to SchemaViolation (TODO noted in-code).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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