docs-gates: smoke per-probe retry + explicit UA; workers: broaden asset-ext classificationclaude/smoke-hardening

smoke.py — BIC independence: probe requests now send an explicit User-Agent
(vyos-docs-smoke/1.0) so the gate no longer depends on a Cloudflare Browser
Integrity Check UA-skip rule surviving. The default Python-urllib UA was blocked
by BIC until that exemption was added; a silent dependency on it is a latent gate
failure the moment the rule is touched.

smoke.py — propagation-race tolerance: each probe now retries up to 3 attempts
(20s apart; MAX_ATTEMPTS + RETRY_SLEEP_SECONDS are module-level so tests can shrink
them) and only fails after the final attempt. A freshly deployed worker version
loses a brief propagation race in which a single probe is served by the PREVIOUS
version (observed: status 307 + stale X-Docs-Build minutes after deploy), which
previously failed the entire gate. Intermediate attempts log SMOKE-RETRY; only
exhaustion logs SMOKE-FAIL and counts a failure. Retry fires only on a not-ok
outcome (wrong status, wrong/missing build header, missing search mount, or a
transport exception); a legitimately-expected 404 passes on the first attempt.

workers/branch — broaden asset classification (CodeRabbit post-merge nit): fold
.pdf into the case-insensitive ASSET_EXT_RE and add webp + otf, so uppercase .PDF
and modern image/font assets get the longer asset cache class. /_static/ and
/_images/ path checks unchanged.

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