docs-gates: hard-bound the smoke deadline (cap probe timeout + inter-round sleep to remaining budget)

Codex adversarial finding: DEADLINE_SECONDS was only checked BEFORE each op, so a
probe or sleep starting at 479s could overshoot to ~510s — 480 was a soft target,
not a hard bound.

Make it hard: run() now computes an absolute deadline = start + DEADLINE_SECONDS
plus a _remaining() helper. The per-probe socket timeout is capped to
min(PROBE_TIMEOUT_SECONDS, max(1, remaining)) — the previously hardcoded 30 is now
the PROBE_TIMEOUT_SECONDS constant; a probe with < 1s of budget is skipped and
counted unresolved. The inter-round sleep is capped to
min(RETRY_SLEEP_SECONDS, remaining) and is skipped entirely when the budget is
exhausted (falling into the existing deadline path). No body-read-level deadline is
added — pages are small, so the socket-op timeout bounds reads adequately.

Deadline-path failure accounting is unchanged. Tests: the probe timeout is capped
to the remaining budget (fake opener records the timeout it was opened with); the
inter-round sleep is capped to the remaining budget (sleep spy); the existing suite
stays green.

🤖 Generated by [robots](https://vyos.io)

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