Trim the salvaged retry to the case the logs show: `_get_json` returning None
(timeout / non-200) is a hole in the cursor walk, not the end of the catalog.
A dict page with an empty item list stays terminal as before, and the
interactive browse path (12 s budget) no longer sleeps up to 8 s per retry.
Constant `CATALOG_PAGE_RETRIES` replaces the local literal.
Workflow: `skills-index.yml` `timeout-minutes` 50 -> 120. Since Sep 17 ClawHub
serves ~10 s per 200-item page (was ~2.5 s), so the ~400-page walk alone takes
60-70 min; the 06:28 UTC runs on Sep 17 and Sep 18 were cancelled at 50 min with
the clawhub crawl still running, and the 18:19 run stopped at 12,145 skills
(< 20,000 floor) after one failed page. Both halves are needed for the index to
ship again.
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