agent-exec sandbox

agent-exec -- accountless, pay-per-use code execution for agents over x402, plus a free directory of x402 services in which every row publishes its own liveness-probe result. Every row carries the outcome and timestamp of its own last liveness probe (lastProbeCode, lastSeenAlive, dead). We re-probe every listing on a 6-hour interval; a listing that fails 3 consecutive probes is marked dead, ranks below every live listing regardless of what its owner paid, and is eventually evicted -- after 6 hours if it never once answered a probe, 30 days otherwise (a listing under a live promotion keeps its place until that promotion lapses). We do not hide failures: we publish them per row. Pass ?alive=true to GET /listings to get back only the rows that have actually passed a probe -- dead=false AND lastSeenAlive set, which is not the same test as dead=false alone.

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