docs: AV16–AV17, and why node --check is not the check

AV16 the allowance that survives a restart and that an operator can see and
change; AV17 the single worker.

And a lesson that cost a full suite run: `node --check` reports success on a
module-syntax error. An unclosed `.map(` inside a tagged template came back
clean four times. `test_spa_syntax.py` says exactly this in its own docstring
— copying to `.mjs` is what forces the module parser — and the reflex still
reached for `node --check`.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01T4YmK41VsEURWFdop4EEeT

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