d8ef9de5c2
The #283 registry model's assembly seam: tap_plan.rs carries TapSubscription (Named{label, params} — fully data-expressible — | Live(closure), the single non-data variant), TapPlan (name → subscription + default; the plan travels with the FoldRegistry it resolves against, the Env-at-resolve pattern, so layered hosts inject vocabulary as data), and the registry itself: eight core entries (record, count, sum, mean, min, max, first, last), each with a doc line (help + roster-enumerating refusals) and a scalar-typed param schema (all v1 entries param-less; the seam ships now because it sits in every entry's build signature). Typed TapPlanError refusals fire pre-bootstrap, before any store I/O; the terminal Store variant keeps the established "writing tap traces failed" register bytes. bind_tap_plan/BoundTaps is the shared wiring pair both declared-tap entry points call; run_signal_r is re-wired onto it here (Recorder bind + post-run try_iter drain replaced — no O(cycles) retention, no per-cycle heap), with all six callers threaded (both CLI run-arm and the four example-identity test calls pass TapPlan::record_all()). run_measurement follows in the next commit. Registry growth stays a new Rust entry (C25); a layer-registered entry is pinned by the injection test, param validation by a schema-carrying test entry (missing/mismatched/unknown all refused with named messages). Verification: cargo build --workspace clean; aura-runner 85+ tests green incl. both example-identity anchors; tap_recording byte-compat anchors green (recorded traces byte-identical, tap-free writes nothing, duplicate-tap refusal unchanged); clippy -D warnings clean. refs #283 refs #77