Harden the anonymous public-share AI assistant against token-cost abuse
before exposing it to the internet:
- Add an env-tunable per-request output ceiling (maxOutputTokens) to the
public-share streamText call so one anonymous request cannot run up the
provider bill even if the per-IP throttle is evaded. New
resolveShareAiMaxOutputTokens() / SHARE_AI_MAX_OUTPUT_TOKENS_DEFAULT
(env SHARE_AI_MAX_OUTPUT_TOKENS, default 512), mirroring
resolveShareAiWorkspaceMax().
- Flip the per-workspace cost limiter to FAIL CLOSED on Redis failure
(was fail-open): if Redis is unavailable we cannot prove the workspace is
under its cap, so deny rather than admit an unmetered, billable call.
- Update the limiter spec (fail-open -> fail-closed) and add resolver tests;
document both knobs in .env.example.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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