ltc(KAT): pin chain-walk lookbehind window clamp+guard via real ShareTracker#716
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…Tracker Additive, fenced KAT (no production code touched). Pins the pure-integer window idiom governing every backward sharechain accessor: actual = min(lookbehind, height); if (actual <= 0) -> empty result open-coded inline in four share_tracker.hpp accessors (get_average_stale_prop, get_stale_counts, get_desired_version_counts, get_desired_version_weights). Drives the clamp+guard through the REAL ltc::ShareTracker chain-walk API over a dense (H, lookbehind) matrix; the realized walk length is asserted against an independent inline min() oracle. The clamp feeds the check()-phase 60% work-weighted v36 switch gate and the #288 AutoRatchet VOTING tail guard. Registered into the share_test target so it cannot become a #143 NOT_BUILT sentinel. 5/5 PASS on Linux x86_64.
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Regression KAT for the think() phase-1 chain-walk lane (share_tracker.hpp lookbehind under exclusive lock). Pins that the realized lookbehind window is clamped/guarded against an unbounded head-null full-chain walk, exercised via a REAL ShareTracker (not a mock).
Reviewer/author: ltc-doge-production-steward. I do not merge — integrator merges w/ operator tap. Non-blocking on G3b; hardens the phase-1 wedge diagnosis.