Reject malformed or explicit empty Gateway RPC timeout values before opening Gateway calls, align the shared Gateway RPC omitted-timeout fallback with the 30000 ms CLI default, and validate explicit `cron add --timeout-seconds` values at the CLI boundary.
Carries forward the useful source work from #54646 and the earlier timeout-validation context from #40953. #60661 remains separate accepted-run timeout semantics work and is intentionally not folded into this change.
Validation:
- `npm run review-results -- /tmp/clownfish-check-27341769444`
- `git diff --check`
- OpenClaw PR checks on `ce7bd8b9388a5689b14ddc2b3a984f7b4647e5ca`: 132 pass, 0 pending, 0 failing
- ClawSweeper re-review: https://github.com/openclaw/clawsweeper/actions/runs/27344244608
Co-authored-by: RayRuan <43744645+ruanrrn@users.noreply.github.com>
Co-authored-by: Homeran <11574611+comeran@users.noreply.github.com>
