lance-graph-contract: un-gate the V2/V3 tail (D-HPR-6a)

[AdaWorldAPI]

D-HPR-6a from plan v3-mandatory-hotplug-reading-v1 (W6a).

What changes

guid-v2-tail and guid-v3-tail used to gate NodeGuid::new_v2, the five V3 classid constants, their registry entries and the codebook module. All of that is now unconditional. The two feature names stay as empty features so the consumers that request them still resolve: deepnsm-v2, MedCare-rs and q2's osint-bake. default is now empty, so a default build and --no-default-features compile the same code.

mint_for's panic arm (a V3 mint requested without the feature) is gone along with the gate. Every in-tree build already had the feature on, so their behaviour does not change.

What does not change

Scope decided on 2026-10-11: the identity key and the edge facet are already read as 16×u8 through the 128-bit opt-in (facet::FacetCascade, classid(4) | 6×(8:8), lo = is_a, hi = part_of). Removing the gate must not move a byte of that. FacetCascade, FacetTier, EdgeFacet and the From bridges are untouched.

Tests

• New canonical_node::v3_mint_is_the_128_bit_facet:
  • a V3 mint equals the hand-built bytes and FacetCascade's lo/hi chains, for the key and for the edge facet;
  • V2 and V3 mint the same bytes;
  • a V1 mint does not match (the silent half).
• Disable run: writing HEEL big-endian inside new_v2 turns 2 of those tests red.
• v3_mint_reachability_probe no longer expects V1 when no feature is on.
• Passing: lance-graph-contract lib (1467) and integration tests, lance-graph-ogar, lance-graph-glove-parity; deepnsm-v2 checks.
• Clippy -D warnings and cargo fmt are clean on the contract.

The board marks D-HPR-6a in PR and D-HPR-7/8 shipped in #1474.

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📥 Commits

Reviewing files that changed from the base of the PR and between 09658a8 and 8a61389.

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📒 Files selected for processing (10)

• .claude/board/STATUS_BOARD.md
• .claude/plans/v3-mandatory-hotplug-reading-v1.md
• crates/lance-graph-contract/Cargo.toml
• crates/lance-graph-contract/src/aiwar.rs
• crates/lance-graph-contract/src/canonical_node.rs
• crates/lance-graph-contract/src/hhtl.rs
• crates/lance-graph-contract/src/lib.rs
• crates/lance-graph-contract/src/ocr.rs
• crates/lance-graph-contract/src/soa_graph.rs
• crates/lance-graph-contract/tests/v3_mint_reachability_probe.rs

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