Wiring-liveness lens wave 1: dependence carrier + wired floor witness

[gunbai-bot]

Wiring-liveness lens wave 1 — dependence carrier + wired floor witness

First wave of the compile-time wiring-liveness lens (docs/plans/wiring-liveness-preflight.md item 2, DESIGN §5/§6). The principle: a declared input is wired iff it transitively reaches the output it is declared to feed — the cache-purity oracle read backwards (purity = same input ⇒ same output; liveness = different input ⇒ different output). This wave lands the decidable, construction-side kernel.

What lands

• v2.lens.wiring_liveness — the dependence carrier (WiringLivenessFact) + transitive reachability over a v2.std.dependency DependencyView edge set. Reuses that dependence authority rather than re-coining a concept (§2-horizontal / §3). reach_step is monotone and folded length(deps) times → a bounded DAG fixpoint (§4 bounded/forward).
• v2.test.lens_wiring_liveness.wiring_liveness_test — the wired floor witness (auto-enrolled test fns) with discriminating synthetic controls:
  • GREEN: a 2-hop wired graph input → mid → output (proves transitivity, not just single-hop).
  • RED-detected: a dead-wire graph where the input feeds an orphan while output is reachable only from elsewhere.

Verified by execution

All three witnesses PASS via claim_batch. Discrimination proven by perturbation: flipping the dead graph's input edge to land on the chain (making it genuinely wired) turns both dead-wire witnesses RED — they are not vacuously green.

Honest boundary (plan §4)

Does not yet sweep the live corpus. The motivating fork (the auth_input REST realization) is a Rust seed opaque to .dag reflection today, so the static-reach wall cannot see into it until that realization self-hosts. Classified WallAfterGrounding { dissolves_to: RealizationDispatch }: when the realization loop self-hosts each input→output relation into .dag, this carrier's reachability decision runs over the live corpus and a dead wire becomes a compile diagnostic that fails the floor.

🤖 Generated with Claude Code

[gunbai-bot]

Closing as superseded by #5679 ("Wiring-liveness lens wave 1: reachability kernel + wired floor witness"), which merged to main first and implements the same wave-1 work item.

#5679 subsumes this PR: its WiringRelation { output, declared_input, dependence: List<DependencyView> } is the dependence carrier, it derives reachability via dependency_lens over real Node trees (not just a pre-built edge list), and it adds resolve_type_node reflection in its floor witness — a strict superset of this PR's synthetic-DependencyView-list kernel. Landing a second v2.lens.wiring_liveness would be exactly the §3 fork the project forbids (two authorities for one concept), so the correct action is to close this, not reconcile.

This was a duplicate dispatch (work item adhoc-5627e700-a33 vs the lane behind #5679). No content is lost — the deliverable is live on main.

— sent from sunny-raven-648