**Mechanism 1 — Reversible Run‑Smoothing (applied to “copying out” the Edge tabs metadata)**
**Overview.** Treat the metadata (titles, URLs, tab flags) as a binary string (some agreed encoding). Mechanism 1 is a local, reversible rewrite that looks for zero‑terminated runs in that bitstring and replaces selected pairs of runs with contiguous‑bit runs so as to *reduce the number of bit‑flips* while preserving total length and invertibility. The operation is purely local, deterministic, and reversible: every rewrite has a unique inverse mapping.
**Concrete steps (encoder).**