wayback, arquivo, certspotter, gitlab, hunter, tomba, mojeek, windvane,
yahoo, pentest-tools, and commoncrawl each built and tore down a fresh
ClientSession (connector, TLS context, proxy resolution) for every page,
poll, or README request. Each adapter now opens one session for its whole
conversation and passes session= to the shared fetchers, matching the
open_session pattern already used by the other paginating providers.
Also removes yahoo's unreachable empty-response guard, collects pages in
a list instead of O(n^2) string concatenation, and strips padded email
local parts with lstrip instead of per-character slicing. Contract tests
assert the proxy selection and session identity at the session owner.
L1ghtn1ng
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