Klickwege lowering: `KlickwegEdge` → ogar-vocab values — a compile-time codegen seam, nothing else

[AdaWorldAPI]

Frame (the part every prior draft got wrong)

This is a compile-time, type-level seam. The consumer repo (a2ui-rs) is ordinary Rust: ruff+OGAR codegen emits code into it, it depends on ogar-vocab (via lance-graph-ogar) as a plain type dependency, and cargo builds it — on a laptop, in CI, on Railway pulling from GitHub. That is the entire compilation story. No build step and no typed-value construction consults the SoA, temporal.rs, NARS, RBAC, mailbox ownership, or lance-graph-planner — that machinery is the running engine's internal mechanics, not a checkpoint a consumer's code clears. Where drained values get recorded when an engine runs is a storage concern (Lance calcification) and is out of scope here; it does not gate the lowering.

Supersedes #208 (closed as hallucinated — its three drafts each imported a wrong layer: storage-as-ingest, runtime-automation-surface, runtime-ownership-ceremony).

Verified facts (cherry-picked from the existing commits; each with receipt)

• a2ui-rs DesktopSession emits KlickwegEdge { from_key: [u8;16], class_id, ordinal, predicate } and drains via take_klickwege() — shipped, a2ui-rs Coordination: OGAR cross-session stance + 3 open decisions + Sprint 7 grill-#9 correction #6 (crates/a2ui-server/src/desktop.rs).
• ogar_vocab::ActionInvocation exists with object_instance + provenance + ActionState (ogar-vocab/src/lib.rs:508).
• SPO emission for invocations exists: ogar-emitter::emit_action_invocation (ogar-emitter/src/lib.rs:774).
• A nav-adjacent Klickwege plane exists: nav_witnessed (ogar-emitter/src/do_adapter.rs:38).
• The authoritative value-dispatch design is docs/ACTIONDEF-VALUE-DISPATCH-PROPOSAL.md.
• The harvested-Klickwege golden is MedCare-rs/tests/golden/nav/klickwege-digest-v2.txt.

The actual work (small, cargo-testable, no ceremony)

1. A lowering function — plain Rust, living either next to the frame types the consumer already uses or as a helper beside ogar-vocab/ogar-emitter: KlickwegEdge → ActionInvocation (action-fire) and KlickwegEdge → nav_witnessed-shaped value (screen jump). Open design points are type-level only: how ordinal: u32 resolves to the action_def String identity (via the class's ActionDef list the consumer already holds), and what subject a human click carries (the existing constructor submit_to_invocation sets System; a click is presumably User — decide and document).
2. A golden test — one harvested Klickweg and one live-emitted KlickwegEdge lower to identical values (cargo test, nothing running).

Acceptance

• Lowering fn(s) compiled + unit-tested by cargo alone
• subject semantics for a UI click decided and documented
• Golden parity test green (harvested ≡ live-lowered)
• No runtime/storage machinery referenced anywhere in the seam

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