session lifecycle: TTL, decrypt recovery, pending WHOAREYOU caps#29
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Add optional session TTL (last_seen_ms on SessionTable entries), handleReceive(now_ms), pending challenge TTL and cap with oldest eviction, and drop session + WHOAREYOU on GCM decrypt failure. pumpOnce forwards now_ms. Tests cover TTL, decrypt mismatch, and SessionTable expiry.
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Summary
session_ttl_msonSessionTable; entries tracklast_seen_ms;get/puttakenow_ms; successful get refreshes activity (extends TTL).handleReceive(..., now_ms)— callers supply a ms clock for TTL and pending bookkeeping (breaking API).pending_challenge_ttl_ms,pending_challenge_cap(oldest evicted when full); challenges storecreated_ms.pumpOnce(..., now_ms)forwards the clock.Tests
zig build test(includes SessionTable TTL, node decrypt-fail + session TTL, existing node/udp coverage updated fornow_ms).Closes #19