* fix(tencent_wsa): fall back when digit-class max_results cannot parse
str.isdigit() accepts values like "²" and "1²" that int() rejects, so a
configured max_results could crash web_search_tool before the HTTP call.
Parse strings with int() inside try/except (matching sibling providers)
while still rejecting bools and non-integral floats.
Fixes#6921
* docs(tencent_wsa): clarify that all float max_results fall back to default
`_parse_results` skipped malformed page entries but returned the collected
list even when it was empty, so a non-empty `Pages` container holding no
usable page fell through to "No results found". That tells the agent the
query legitimately matched nothing instead of surfacing the malformed
payload -- the failure mode the sibling providers already contain (brave
#6550, groundroute #6603, tavily #6645, sofya #6719), and the rule the
tavily changelog entry already lists `tencent_wsa` as applying.
A missing or null `Pages` stays an empty search, a non-list container keeps
the existing structured format error, and individual malformed entries in an
otherwise valid container are still skipped so the valid rows survive. Only
the non-empty-container-with-no-usable-page case now returns the provider's
format error and logs the container, never the query or payload values.
RED/GREEN: the 5 new cases fail on main with "No results found" and pass with
the fix (stash-compared source-only); test_tencent_wsa_tools.py 33 passed,
the five provider suites 281 passed, ruff check and format clean.
Co-authored-by: Willem Jiang <willem.jiang@gmail.com>
