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On Windows, resolveSpawnCommand routes `npx` through node + npm's
npx-cli.js (avoiding the un-spawnable npx.cmd), locating that CLI via
npm_execpath. When the script is run directly with `node audio.mjs`
instead of through npm/npx, npm_execpath is unset, so resolution returns
null and spawnP short-circuited to `{status:-1}` — silently. With
stdio:"ignore" hiding everything, callers just reported "TTS failed -
omitted" for every single line, giving no hint that the real cause was
an unresolvable npx. Debugging required reading the source.
Fix: when spawnP hits that null-resolution path, emit a clear one-time
diagnostic naming npm_execpath and the remedy (run via npx/npm, or export
npm_execpath) before returning {status:-1}. One-shot latch so a batch of
lines logs it once, not per line. Behavior is otherwise unchanged — still
returns {status:-1} and spawns nothing.
Test: new tts.spawn.test.mjs case — two consecutive win32 npx calls with
npm_execpath unset both return {status:-1}, nothing is spawned, and the
diagnostic (mentioning npm_execpath) is emitted exactly once. Existing
spawn tests unchanged (7/7 pass).