Closes the two staged items recorded in the acceptance packet §7 (ruled
non-blocking at ratification, tracked work):
P1 — kappa_search_event(): JSONL-ready execution-telemetry envelope for
the Fibonacci κ search (kind=fibonacci_kappa_search; certificate payload
with content-addressed cert_id, or failure payload with baseline κ=1.0).
propose_kappa_line_search gains an optional sink (any emit(line) object,
e.g. chat.telemetry sinks) that writes one deterministic JSONL line.
Pure serialization — no state, no COHERENT standing (§6 sovereignty).
P2 — cross_band_discovery_gate(): persistence verdict over a surprise-
event history across the F5/F6/F7 Fibonacci bands (τ = {5,8,13}·τ0).
Eligible ⇔ history spans ≥ F5·τ0 (a single fresh spike has zero temporal
persistence) AND every band's decay-weighted accumulation ≥ γ. Typed
CrossBandVerdict; pure; PROPOSAL-side only. Lives in multi_scale_energy
(Tier-2, serve-quarantined) so the gate can never touch serving —
re-pinned by the module-level sys.modules probe in the new test file.
TDD RED→GREEN. [Verification]: carry-seam suite 10 passed; regression
(goldtether consumers + multi_scale + fibonacci + chiral + quarantine +
cohesion) 85 passed; smoke suite passed locally (133s, 175 passed).
