nav: prove klickweg connectivity via the sanctioned Core brick (ruff #61 · lance-graph #669/#670/#673)

[AdaWorldAPI]

What & why

ruff #61 landed the harvest half of the navigation-topology arm — ruff_spo_triplet::Predicate::NavigatesTo (the agnostic "screen→screen" SPO fact, count 64→65) + the WinForms navigates_to harvester. Its Core consumer half — contract::class_view::{screens_reachable_from, nav_is_fully_connected} (lance-graph #670, strengthened to reached == screens by codex P2 in #673) — is now the sanctioned brick for the exact connectivity check op-nexgen had hand-rolled as a live scripts/nav-crawl.sh BFS.

This migrates op-nexgen's klickweg connectivity onto that brick — the same off-brick → sanctioned-brick move already done for WideFieldMask::from_universe_present (#669).

The Lego-kit wiring

• SCREEN_UNIVERSE is the single source of screen order; a screen's position is its index there, shared by both the mask universe and the ComputeEdge positions, so the two can never drift.
• served_screens_mask() mints the screens universe via the sanctioned WideFieldMask::from_universe_present (carries the 256-field SoC guard), never an ad-hoc from_positions.
• NAV_EDGES reuses the Core ComputeEdge shape (the jump half of the topology kit) — one more brick, not a parallel edge type.
• klickweg_is_connected() = nav_is_fully_connected(NAV_ROOT, NAV_EDGES, served):
  • asserted at boot (WARN, non-fatal — a disconnected nav graph is a level-editor bug, not a reason to refuse to serve);
  • proven at test time (klickweg_is_fully_connected_via_core_brick) — the compile-time counterpart to the live crawl.
• nav_edges_match_static_table cross-checks the static NAV_EDGES manifest against the live nav_edges derivation so it can't silently drift; screen_universe_matches_routes proves every declared screen is actually routed.

Compile-safety of ruff #61

The additive Predicate::NavigatesTo variant is compile-safe for op-nexgen — the crate consumes ModelGraph / Triple / expand / Field / Model / Function, never an exhaustive match on Predicate. Verified.

Tests

• op-server nav:: 7/7 green (2 new connectivity/drift tests + 1 route-coverage test, 4 pre-existing).
• Zero new warnings vs main — the 5 pre-existing nav.rs dead-code/doc warnings are unchanged (confirmed by clippy on pristine main).

🤖 Generated with Claude Code

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