feat(op-canon): re-export ogar_class_view::OgarClassView (Northstar C2 sibling)

[AdaWorldAPI]

What

C2 sibling of redmine-rs#6 — re-exports OgarClassView + the projection trait surface from ogar_class_view + lance_graph_contract::class_view through op_canon::class_view.

Symmetric pattern with the existing class_ids re-exports (#49 / #50): the source of truth lives in OGAR, this port re-exports so downstream op-* crates have one import path.

Surface

• Cargo.toml: adds ogar-class-view + lance-graph-contract git deps.
• src/class_view.rs (new): re-exports OgarClassView, ClassView, ClassId, FieldMask, RenderRow, ClassProjection, FieldRef, ObjectView, DisplayTemplate.

The five-line muscle-memory loop (Northstar §2.3)

use op_canon::class_view::{OgarClassView, ClassView, FieldMask};
use op_canon::class_ids::PROJECT_WORK_ITEM;

let view = OgarClassView::new();
let mask = FieldMask::EMPTY.with(0).with(1);
let rows = view.render_rows(PROJECT_WORK_ITEM, mask);
// rows feed an askama projection template — HTML / JSON / whatever.

Tests (+3 unit, +1 doctest)

• re_export_loads_the_canonical_class_view
• render_rows_skips_off_bits_through_the_re_export
• snapshot_ids_resolve_through_the_re_exported_view — every concept the OpenProject snapshot promotes resolves to a non-empty field set via the re-exported view.
• Doctest pinning the public API.

12/12 unit + 2 doctests (was 9 + 1). Workspace check + test green; clippy + fmt clean.

Scope

Purely additive — one new file, one pub mod line, two new git deps.

---

Generated by Claude Code