feat(ogar-doc-ir): project — ClassView × WideFieldMask masking over the in-memory DocIr

[AdaWorldAPI]

What

Makes the neutral observation IR (DocIr) addressable by a class's field basis — the seam a discovery consumer (e.g. lance-graph-arm-discovery) needs — without serialization and without the IR depending on any consumer.

New off-by-default classview feature → project module:

• field_mask(ir, view, class) -> WideFieldMask — bit i set iff the document carries the i-th field of the class. Read straight from ir.fields × view.fields(class) in memory. Presence IS the mask bit — no ∅ sentinel is invented at any boundary.
• masked_values(ir, view, class) -> Vec<MaskedField> — the typed values addressed through the mask, borrowed in place, in class (bit) order.
• position_of(view, class, key) — maps a DocIr field key to its ClassView bit position (FieldRef.label, then predicate_iri); an off-vocabulary key is dropped at the addressing boundary, never folded onto a valid bit.

The dependency arrow points OUT

The neutral IR hands out a mask + addressed values; a consumer builds its own Dataset/FeatureSpec — presence → binary feature, addressed values → interned categories. ogar-doc-ir never names the arm crate, never builds a Dataset, never serializes. This is ClassView addressing as masking over existing in-memory data, not a wire format (the Firewall, ADR-022/023).

Dependency + build discipline

• Depends only on the zero-dep masking contract lance-graph-contract (ClassView / FieldMask / WideFieldMask), wired via git branch = "main" — the float-then-flip form the sibling ogar-class-view / ogar-from-ruff / ogar-render-askama crates use.
• Default build stays serde-only / no-canon (feature off), so the observation IR still lands ahead of the W4 classid ratification.

Verification (Rust 1.95, -p ogar-doc-ir)

• cargo test --features classview → 22 passed (6 new project tests: mask sets exactly the carried bits · off-vocabulary field dropped · predicate_iri matching · values in bit order · values agree with the mask · duplicate-first-wins).
• cargo build (default) → serde-only, canon dep not pulled.
• cargo clippy --features classview --all-targets -- -D warnings → clean.
• cargo fmt --check → clean.

🤖 Generated with Claude Code

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Generated by Claude Code

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