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Repeated Sandbox.Timedout chunks can leave @sparticuz/chromium returning a falsy/empty path on subsequent invocations — warm instances on the same execution environment never re-extract chromium. The downstream puppeteer-core assertion about needing an executablePath or channel buries the actionable cause; a cost- analysis sweep took ~30 min to root-cause from that trace. Guard the resolver: if mod.executablePath() returns a non-string, empty string, or a path that does not exist on disk, throw a typed ChromeBinaryUnavailableError whose message points at the recycle remedy (env-var bump or redeploy). Add the error name to the three NON_RETRYABLE lists so SFN short-circuits instead of burning four 15-min retries on a function that won't recover. Same typed-error contract for the chrome-headless-shell fallback so both sources fail consistently. Tests pin the wedge path (empty string + non-existent file) and the carried metadata (source + resolvedPath). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>